public class DefaultGroovyMethods extends DefaultGroovyMethodsSupport
Defines new groovy methods which appear on classes inside the Groovy environment.
Static methods are used with the first parameter being the destination class,
i.e. public static String reverse(String self)
provides a
reverse()
method for String
.
NOTE: While this class contains many 'public' static methods, it is primarily regarded as an internal class (its internal package name suggests this also). We value backwards compatibility of these methods when used within Groovy but value less backwards compatibility at the Java method call level. I.e. future versions of Groovy may remove or move a method call in this file but would normally aim to keep the method available from within Groovy.
Modifiers | Name | Description |
---|---|---|
static Class[] |
ADDITIONAL_CLASSES |
|
static Class[] |
DGM_LIKE_CLASSES |
Type Params | Return Type | Name and description |
---|---|---|
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public static int |
abs(Number number) Gets the absolute value. |
|
public static long |
abs(Long number) Gets the absolute value. |
|
public static float |
abs(Float number) Gets the absolute value. |
|
public static double |
abs(Double number) Gets the absolute value. |
<T> |
public static boolean |
addAll(Collection<T> self, Iterator<? extends T> items) Adds all items from the iterator to the Collection. |
<T> |
public static boolean |
addAll(Collection<T> self, Iterable<? extends T> items) Adds all items from the iterable to the Collection. |
<T> |
public static boolean |
addAll(Collection<T> self, T[] items) Modifies the collection by adding all the elements in the specified array to the collection. |
<T> |
public static boolean |
addAll(List<T> self, int index, T[] items) Modifies this list by inserting all the elements in the specified array into the list at the specified position. |
|
public static void |
addShutdownHook(Object self, Closure closure) Allows the usage of addShutdownHook without getting the runtime first. |
|
public static Number |
and(Number left, Number right) Bitwise AND together two Numbers. |
|
public static BitSet |
and(BitSet left, BitSet right) Bitwise AND together two BitSets. |
|
public static Boolean |
and(Boolean left, Boolean right) Logical conjunction of two boolean operators. |
<T> |
public static Set<T> |
and(Set<T> left, Iterable<T> right) Creates a Set composed of the intersection of a Set and an Iterable. |
<T> |
public static Set<T> |
and(Set<T> left, Iterable<T> right, Comparator<? super T> comparator) Creates a Set composed of the intersection of a Set and an Iterable. |
<T> |
public static SortedSet<T> |
and(SortedSet<T> left, Iterable<T> right) Creates a SortedSet composed of the intersection of a SortedSet and an Iterable. |
<T> |
public static SortedSet<T> |
and(SortedSet<T> left, Iterable<T> right, Comparator<? super T> comparator) Creates a SortedSet composed of the intersection of a SortedSet and an Iterable. |
|
public static boolean |
any(Object self) Iterates over the elements of a collection, and checks whether at least one element is true according to the Groovy Truth. |
|
public static boolean |
any(Object self, Closure predicate) Iterates over the contents of an object or collection, and checks whether a predicate is valid for at least one element. |
<T> |
public static boolean |
any(Iterator<T> self, Closure predicate) Iterates over the contents of an iterator, and checks whether a predicate is valid for at least one element. |
<T> |
public static boolean |
any(Iterable<T> self, Closure predicate) Iterates over the contents of an iterable, and checks whether a predicate is valid for at least one element. |
<K, V> |
public static boolean |
any(Map<K, V> self, Closure<?> predicate) Iterates over the entries of a map, and checks whether a predicate is valid for at least one entry. |
<T> |
public static boolean |
any(T[] self, Closure predicate) |
|
public static boolean |
asBoolean(Object object) Coerce an object instance to a boolean value. |
|
public static boolean |
asBoolean(Boolean bool) Coerce a Boolean instance to a boolean value. |
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public static boolean |
asBoolean(AtomicBoolean bool) Coerce an AtomicBoolean instance to a boolean value. |
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public static boolean |
asBoolean(Collection collection) Coerce a collection instance to a boolean value. |
|
public static boolean |
asBoolean(Map map) Coerce a map instance to a boolean value. |
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public static boolean |
asBoolean(Iterator iterator) Coerce an iterator instance to a boolean value. |
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public static boolean |
asBoolean(Enumeration enumeration) Coerce an enumeration instance to a boolean value. |
|
public static boolean |
asBoolean(Character character) Coerce a character to a boolean value. |
|
public static boolean |
asBoolean(Float object) Coerce a Float instance to a boolean value. |
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public static boolean |
asBoolean(Double object) Coerce a Double instance to a boolean value. |
|
public static boolean |
asBoolean(Number number) Coerce a number to a boolean value. |
|
public static boolean |
asBoolean(boolean[] self) |
|
public static boolean |
asBoolean(byte[] self) |
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public static boolean |
asBoolean(char[] self) |
|
public static boolean |
asBoolean(short[] self) |
|
public static boolean |
asBoolean(int[] self) |
|
public static boolean |
asBoolean(long[] self) |
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public static boolean |
asBoolean(float[] self) |
|
public static boolean |
asBoolean(double[] self) |
|
public static boolean |
asBoolean(Object[] self) |
<T> |
public static List<T> |
asChecked(List<T> self, Class<T> type) Creates a checked view of a List. |
<T> |
public static Queue<T> |
asChecked(Queue<T> self, Class<T> type) Creates a checked view of a Queue. |
<T> |
public static Collection<T> |
asChecked(Collection<T> self, Class<T> type) Creates a checked view of a Collection. |
<T> |
public static Set<T> |
asChecked(Set<T> self, Class<T> type) Creates a checked view of a Set. |
<T> |
public static SortedSet<T> |
asChecked(SortedSet<T> self, Class<T> type) Creates a checked view of a SortedSet. |
<T> |
public static NavigableSet<T> |
asChecked(NavigableSet<T> self, Class<T> type) Creates a checked view of a NavigableSet. |
<K, V> |
public static Map<K, V> |
asChecked(Map<K, V> self, Class<K> keyType, Class<V> valueType) Creates a checked view of a Map. |
<K, V> |
public static SortedMap<K, V> |
asChecked(SortedMap<K, V> self, Class<K> keyType, Class<V> valueType) Creates a checked view of a SortedMap. |
<K, V> |
public static NavigableMap<K, V> |
asChecked(NavigableMap<K, V> self, Class<K> keyType, Class<V> valueType) Creates a checked view of a NavigableMap. |
<T> |
public static Collection<T> |
asCollection(Iterable<T> self) Converts this Iterable to a Collection. |
<K, V> |
public static Map<K, V> |
asImmutable(Map<K, V> self) A convenience method for creating an immutable Map. |
<K, V> |
public static SortedMap<K, V> |
asImmutable(SortedMap<K, V> self) A convenience method for creating an immutable SortedMap. |
<T> |
public static List<T> |
asImmutable(List<T> self) A convenience method for creating an immutable List. |
<T> |
public static Set<T> |
asImmutable(Set<T> self) A convenience method for creating an immutable Set. |
<T> |
public static SortedSet<T> |
asImmutable(SortedSet<T> self) A convenience method for creating an immutable SortedSet. |
<T> |
public static Collection<T> |
asImmutable(Collection<T> self) A convenience method for creating an immutable Collection. |
<T> |
public static List<T> |
asList(Iterable<T> self) Converts this Iterable to a List. |
<T> |
public static List<T> |
asReversed(List<T> self) Creates a view list with reversed order, and the order of original list will not change. |
<T> |
public static NavigableSet<T> |
asReversed(NavigableSet<T> self) Creates a reverse order view of the set. |
|
public static String |
asString(Throwable self) Get the detail information of Throwable instance's stack trace |
<K, V> |
public static Map<K, V> |
asSynchronized(Map<K, V> self) Creates a synchronized view of a Map. |
<K, V> |
public static SortedMap<K, V> |
asSynchronized(SortedMap<K, V> self) Creates a synchronized view of a SortedMap. |
<K, V> |
public static NavigableMap<K, V> |
asSynchronized(NavigableMap<K, V> self) Creates a synchronized view of a NavigableMap. |
<T> |
public static Collection<T> |
asSynchronized(Collection<T> self) Creates a synchronized view of a Collection. |
<T> |
public static List<T> |
asSynchronized(List<T> self) Creates a synchronized view of a List. |
<T> |
public static Set<T> |
asSynchronized(Set<T> self) Creates a synchronized view of a Set. |
<T> |
public static SortedSet<T> |
asSynchronized(SortedSet<T> self) Creates a synchronized view of a SortedSet. |
<T> |
public static NavigableSet<T> |
asSynchronized(NavigableSet<T> self) Creates a synchronized view of a NavigableSet. |
<T> |
public static T |
asType(Iterable iterable, Class<T> clazz) Converts the given iterable to another type. |
<T> |
public static T |
asType(Collection col, Class<T> clazz) Converts the given collection to another type. |
<T> |
public static T |
asType(Closure impl, Class<T> type) Coerces the closure to an implementation of the given class. |
<T> |
public static T |
asType(Map map, Class<T> clazz) Coerces this map to the given type, using the map's keys as the public method names, and values as the implementation. |
<T> |
public static T |
asType(Number self, Class<T> type) Transform this number to the given type, using the 'as' operator. |
<T> |
public static T |
asType(Object obj, Class<T> type) Converts a given object to a type. |
<T> |
public static T |
asType(Object[] self, Class<T> type) |
<K, V> |
public static Map<K, V> |
asUnmodifiable(Map<K, V> self) Creates an unmodifiable view of a Map. |
<K, V> |
public static SortedMap<K, V> |
asUnmodifiable(SortedMap<K, V> self) Creates an unmodifiable view of a SortedMap. |
<K, V> |
public static SortedMap<K, V> |
asUnmodifiable(NavigableMap<K, V> self) Creates an unmodifiable view of a NavigableMap. |
<T> |
public static List<T> |
asUnmodifiable(List<T> self) Creates an unmodifiable view of a List. |
<T> |
public static Set<T> |
asUnmodifiable(Set<T> self) Creates an unmodifiable view of a Set. |
<T> |
public static SortedSet<T> |
asUnmodifiable(SortedSet<T> self) Creates an unmodifiable view of a SortedSet. |
<T> |
public static NavigableSet<T> |
asUnmodifiable(NavigableSet<T> self) Creates an unmodifiable view of a NavigableSet. |
<T> |
public static Collection<T> |
asUnmodifiable(Collection<T> self) Creates an unmodifiable view of a Collection. |
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public static Object |
average(Iterable<?> self) Averages the items in an Iterable. |
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public static Object |
average(Iterator<?> self) Averages the items from an Iterator. |
<T> |
public static Object |
average(Iterable<T> self, Closure closure) Averages the result of applying a closure to each item of an Iterable. |
<T> |
public static Object |
average(Iterator<T> self, Closure closure) Averages the result of applying a closure to each item returned from an iterator. |
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public static BigDecimal |
average(byte[] self) |
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public static BigDecimal |
average(short[] self) |
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public static BigDecimal |
average(int[] self) |
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public static BigDecimal |
average(long[] self) |
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public static double |
average(float[] self) |
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public static double |
average(double[] self) |
|
public static Object |
average(Object[] self) |
<T> |
public static Object |
average(T[] self, Closure closure) |
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public static BitSet |
bitwiseNegate(BitSet self) Bitwise NEGATE a BitSet. |
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public static Number |
bitwiseNegate(Number left) Bitwise NEGATE a Number. |
<T> |
public static BufferedIterator<T> |
buffered(Iterator<T> self) Returns a BufferedIterator that allows examining the next element without
consuming it.
|
<T> |
public static BufferedIterator<T> |
bufferedIterator(Iterable<T> self) Returns a BufferedIterator that allows examining the next element without
consuming it.
|
<T> |
public static BufferedIterator<T> |
bufferedIterator(List<T> self) Returns a BufferedIterator that allows examining the next element without
consuming it.
|
<T> |
protected static T |
callClosureForLine(Closure<T> closure, String line, int counter) |
<T, K, V> |
protected static T |
callClosureForMapEntry(Closure<T> closure, Map.Entry<K, V> entry) |
<T, K, V> |
protected static T |
callClosureForMapEntryAndCounter(Closure<T> closure, Map.Entry<K, V> entry, int counter) |
<T> |
public static List<List<T>> |
chop(Iterable<T> self, int chopSizes) Chops the Iterable into pieces, returning lists with sizes corresponding to the supplied chop sizes. |
<T> |
public static List<List<T>> |
chop(Iterator<T> self, int chopSizes) Chops the iterator items into pieces, returning lists with sizes corresponding to the supplied chop sizes. |
<T> |
public static List<List<T>> |
chop(T[] self, int chopSizes) |
<T> |
public static List<List<T>> |
collate(Iterable<T> self, int size) Collates this iterable into sub-lists of length size .
|
<T> |
public static List<List<T>> |
collate(Iterable<T> self, int size, int step) Collates this iterable into sub-lists of length size stepping through the code step
elements for each subList.
|
<T> |
public static List<List<T>> |
collate(Iterable<T> self, int size, boolean keepRemainder) Collates this iterable into sub-lists of length size . |
<T> |
public static List<List<T>> |
collate(Iterable<T> self, int size, int step, boolean keepRemainder) Collates this iterable into sub-lists of length size stepping through the code step
elements for each sub-list. |
<T> |
public static List<List<T>> |
collate(T[] self, int size) |
<T> |
public static List<List<T>> |
collate(T[] self, int size, int step) |
<T> |
public static List<List<T>> |
collate(T[] self, int size, boolean keepRemainder) |
<T> |
public static List<List<T>> |
collate(T[] self, int size, int step, boolean keepRemainder) |
|
public static Collection |
collect(Object self) Iterates through this aggregate Object transforming each item into a new value using Closure.IDENTITY as a transformer, basically returning a list of items copied from the original object. |
<T> |
public static List<T> |
collect(Object self, Closure<T> transform) Iterates through this aggregate Object transforming each item into a new value using the transform closure, returning a list of transformed values. |
<T, C extends Collection<T>> |
public static C |
collect(Object self, C collector, Closure<? extends T> transform) Iterates through this aggregate Object transforming each item into a new value using the transform closure
and adding it to the supplied collector . |
<E, T> |
public static List<T> |
collect(Iterator<E> self, Closure<T> transform) Iterates through this Iterator transforming each item into a new value using the transform closure, returning a list of transformed values. |
<E, T, C extends Collection<T>> |
public static C |
collect(Iterator<E> self, C collector, Closure<? extends T> transform) Iterates through this Iterator transforming each item into a new value using the transform closure
and adding it to the supplied collector . |
<T> |
public static List<T> |
collect(Iterable<T> self) Iterates through this collection transforming each entry into a new value using Closure.IDENTITY as a transformer, basically returning a list of items copied from the original collection. |
<E, T> |
public static List<T> |
collect(Iterable<E> self, Closure<T> transform) Iterates through this Iterable transforming each entry into a new value using the transform closure
returning a list of transformed values. |
<E, T, C extends Collection<T>> |
public static C |
collect(Iterable<E> self, C collector, Closure<? extends T> transform) Iterates through this collection transforming each value into a new value using the transform closure
and adding it to the supplied collector . |
<T, K, V, C extends Collection<T>> |
public static C |
collect(Map<K, V> self, C collector, Closure<? extends T> transform) Iterates through this Map transforming each map entry into a new value using the transform closure
returning the collector with all transformed values added to it. |
<T, K, V> |
public static List<T> |
collect(Map<K, V> self, Closure<T> transform) Iterates through this Map transforming each map entry into a new value using the transform closure
returning a list of transformed values. |
<E, T> |
public static List<T> |
collect(E[] self, Closure<T> transform) |
<E, T, C extends Collection<T>> |
public static C |
collect(E[] self, C collector, Closure<? extends T> transform) |
<K, V, X, Y> |
public static Map<K, V> |
collectEntries(Map<X, Y> self, Map<K, V> collector, Closure<?> transform) Iterates through this Map transforming each map entry using the transform closure
returning a map of the transformed entries. |
<K, V, X, Y> |
public static Map<K, V> |
collectEntries(Map<X, Y> self, Closure<?> transform) Iterates through this Map transforming each entry using the transform closure
and returning a map of the transformed entries. |
<K, V, E> |
public static Map<K, V> |
collectEntries(Iterator<E> self, Closure<?> transform) A variant of collectEntries for Iterators. |
<K, V, E> |
public static Map<K, V> |
collectEntries(Iterable<E> self, Closure<?> transform) Iterates through this Iterable transforming each item using the transform closure
and returning a map of the resulting transformed entries. |
<K, V> |
public static Map<K, V> |
collectEntries(Iterator<?> self) A variant of collectEntries for Iterators using the identity closure as the transform. |
<K, V> |
public static Map<K, V> |
collectEntries(Iterable<?> self) A variant of collectEntries for Iterable objects using the identity closure as the transform. |
<K, V, E> |
public static Map<K, V> |
collectEntries(Iterator<E> self, Map<K, V> collector, Closure<?> transform) A variant of collectEntries for Iterators using a supplied map as the destination of transformed entries. |
<K, V, E> |
public static Map<K, V> |
collectEntries(Iterator<E> self, Map<K, V> collector, Function<? super E, K> keyTransform, Function<? super E, V> valueTransform) A variant of collectEntries for Iterators with separate functions for transforming the keys and values. |
<K, V, E> |
public static Map<K, V> |
collectEntries(Iterator<E> self, Function<? super E, K> keyTransform, Function<? super E, V> valueTransform) A variant of collectEntries for Iterators with separate functions for transforming the keys and values. |
<K, V, E> |
public static Map<K, V> |
collectEntries(Iterable<E> self, Map<K, V> collector, Function<? super E, K> keyTransform, Function<? super E, V> valueTransform) A variant of collectEntries for Iterables with separate functions for transforming the keys and values. |
<K, V, E> |
public static Map<K, V> |
collectEntries(Iterable<E> self, Function<? super E, K> keyTransform, Function<? super E, V> valueTransform) A variant of collectEntries for Iterables with separate functions for transforming the keys and values. |
<K, V, X, Y> |
public static Map<K, V> |
collectEntries(Map<X, Y> self, Map<K, V> collector, Function<? super X, K> keyTransform, Function<? super Y, V> valueTransform) A variant of collectEntries for Maps with separate functions for transforming the keys and values. |
<K, V, X, Y> |
public static Map<K, V> |
collectEntries(Map<X, Y> self, Function<? super X, K> keyTransform, Function<? super Y, V> valueTransform) A variant of collectEntries for Maps with separate functions for transforming the keys and values. |
<K, V, E> |
public static Map<K, V> |
collectEntries(Iterable<E> self, Map<K, V> collector, Closure<?> transform) Iterates through this Iterable transforming each item using the closure as a transformer into a map entry, returning the supplied map with all the transformed entries added to it. |
<K, V> |
public static Map<K, V> |
collectEntries(Iterator<?> self, Map<K, V> collector) A variant of collectEntries for Iterators using the identity closure as the transform and a supplied map as the destination of transformed entries. |
<K, V> |
public static Map<K, V> |
collectEntries(Iterable<?> self, Map<K, V> collector) A variant of collectEntries for Iterables using the identity closure as the transform and a supplied map as the destination of transformed entries. |
<K, V, E> |
public static Map<K, V> |
collectEntries(E[] self) |
<K, V, E> |
public static Map<K, V> |
collectEntries(E[] self, Map<K, V> collector) |
<K, V, E> |
public static Map<K, V> |
collectEntries(E[] self, Closure<?> transform) |
<K, V, E> |
public static Map<K, V> |
collectEntries(E[] self, Map<K, V> collector, Closure<?> transform) |
<K, V> |
public static Map<K, V> |
collectKeys(Map<K, V> keys, Map<K, V> collector, Function<? super K, K> keyTransform) Transform a Maps' keys leaving the values unchanged. |
<K, V> |
public static Map<K, V> |
collectKeys(Map<K, V> keys, Function<? super K, K> keyTransform) Transform a Maps' keys leaving the values unchanged. |
<T, E> |
public static List<T> |
collectMany(Iterable<E> self, Closure<? extends Collection<? extends T>> projection) Projects each item from a source Iterable to a collection and concatenates (flattens) the resulting collections into a single list. |
<T, E, C extends Collection<T>> |
public static C |
collectMany(Iterable<E> self, C collector, Closure<? extends Collection<? extends T>> projection) Projects each item from a source collection to a result collection and concatenates (flattens) the resulting collections adding them into the collector . |
<T, K, V, C extends Collection<T>> |
public static C |
collectMany(Map<K, V> self, C collector, Closure<? extends Collection<? extends T>> projection) Projects each item from a source map to a result collection and concatenates (flattens) the resulting collections adding them into the collector . |
<T, K, V> |
public static List<T> |
collectMany(Map<K, V> self, Closure<? extends Collection<? extends T>> projection) Projects each item from a source map to a result collection and concatenates (flattens) the resulting collections adding them into a collection. |
<T, E, C extends Collection<T>> |
public static C |
collectMany(Iterator<E> self, C collector, Closure<? extends Collection<? extends T>> projection) Projects each item from a source iterator to a collection and concatenates (flattens) the resulting collections into a single list. |
<T, E> |
public static List<T> |
collectMany(Iterator<E> self, Closure<? extends Collection<? extends T>> projection) Projects each item from a source iterator to a collection and concatenates (flattens) the resulting collections into a single list. |
<T, E> |
public static List<T> |
collectMany(E[] self, Closure<? extends Collection<? extends T>> projection) |
<T, E, C extends Collection<T>> |
public static C |
collectMany(E[] self, C collector, Closure<? extends Collection<? extends T>> projection) |
<T, K, V> |
public static Collection<T> |
collectMany$$bridge(Map<K, V> self, Closure<? extends Collection<? extends T>> projection) |
|
public static List |
collectNested(Collection self, Closure transform) Recursively iterates through this collection transforming each non-Collection value into a new value using the closure as a transformer. |
|
public static List |
collectNested(Iterable self, Closure transform) Recursively iterates through this Iterable transforming each non-Collection value into a new value using the closure as a transformer. |
<C extends Collection> |
public static C |
collectNested(Iterable self, C collector, Closure transform) Recursively iterates through this Iterable transforming each non-Collection value into a new value using the transform closure. |
<K, V> |
public static Map<K, V> |
collectValues(Map<K, V> keys, Map<K, V> collector, Function<? super V, V> valueTransform) Transform a Maps' values leaving the keys unchanged. |
<K, V> |
public static Map<K, V> |
collectValues(Map<K, V> keys, Function<? super V, V> valueTransform) Transform a Maps' values leaving the keys unchanged. |
|
public static List<List> |
combinations(Iterable self) Finds all combinations of items from the given aggregate of collections. |
<T> |
public static List<T> |
combinations(Iterable self, Closure<T> function) Finds all combinations of items from the given aggregate of collections, then returns the results of the supplied transform. |
|
public static int |
compareTo(Character left, Number right) Compares a Character and a Number. |
|
public static int |
compareTo(Number left, Character right) Compares a Number and a Character. |
|
public static int |
compareTo(Character left, Character right) Compares two Characters. |
|
public static int |
compareTo(Number left, Number right) Compares two Numbers. |
|
public static boolean |
contains(Iterable self, Object item) Returns true if this iterable contains the item. |
|
public static boolean |
contains(boolean[] self, Object value) |
|
public static boolean |
contains(byte[] self, Object value) |
|
public static boolean |
contains(char[] self, Object value) |
|
public static boolean |
contains(short[] self, Object value) |
|
public static boolean |
contains(int[] self, Object value) |
|
public static boolean |
contains(long[] self, Object value) |
|
public static boolean |
contains(float[] self, Object value) |
|
public static boolean |
contains(double[] self, Object value) |
|
public static boolean |
contains(Object[] self, Object value) |
|
public static boolean |
containsAll(Iterable<?> self, Object[] items) Returns true if this iterable contains all the elements in the specified array. |
|
public static Number |
count(Iterator self, Object value) Counts the number of occurrences of the given value from the items within this Iterator. |
<T> |
public static Number |
count(Iterator<T> self, Closure closure) Counts the number of occurrences which satisfy the given closure from the items within this Iterator. |
<T, E extends Number> |
public static E |
count(Iterator<T> self, E initialCount, Closure closure) Counts the number of occurrences which satisfy the given closure from the items within this Iterator, adding the count to the initial count. |
|
public static Number |
count(Iterable self, Object value) Counts the number of occurrences of the given value inside this Iterable. |
<T> |
public static Number |
count(Iterable<T> self, Closure closure) Counts the number of occurrences which satisfy the given closure from inside this Iterable. |
<T, E extends Number> |
public static E |
count(Iterable<T> self, E initialCount, Closure closure) Counts the number of occurrences which satisfy the given closure from inside this Iterable. |
<K, V> |
public static Number |
count(Map<K, V> self, Closure<?> closure) Counts the number of occurrences which satisfy the given closure from inside this map. |
<K, V, E extends Number> |
public static E |
count(Map<K, V> self, E initialCount, Closure<?> closure) Counts the number of occurrences which satisfy the given closure from inside this map. |
|
public static Number |
count(boolean[] self, Object value) |
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public static Number |
count(byte[] self, Object value) |
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public static Number |
count(char[] self, Object value) |
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public static Number |
count(short[] self, Object value) |
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public static Number |
count(int[] self, Object value) |
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public static Number |
count(long[] self, Object value) |
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public static Number |
count(float[] self, Object value) |
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public static Number |
count(double[] self, Object value) |
|
public static Number |
count(Object[] self, Object value) |
<T> |
public static Number |
count(T[] self, Closure predicate) |
<K, E> |
public static Map<K, Integer> |
countBy(Iterable<E> self, Closure<K> closure) Sorts all collection members into groups determined by the supplied mapping closure and counts the group size. |
<E> |
public static Map<E, Integer> |
countBy(Iterable<E> self) Creates a multiset-like map of the collection members. |
<K, E> |
public static Map<K, Integer> |
countBy(Iterator<E> self, Closure<K> closure) Sorts all iterator items into groups determined by the supplied mapping closure and counts the group size. |
<E> |
public static Map<E, Integer> |
countBy(Iterator<E> self) Creates a multiset-like map of the iterator members. |
<K, U, V> |
public static Map<K, Integer> |
countBy(Map<U, V> self, Closure<K> closure) Groups the members of a map into groups determined by the supplied mapping closure and counts the frequency of the created groups. |
<K, E> |
public static Map<K, Integer> |
countBy(E[] self, Closure<K> closure) |
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public static boolean |
disjoint(Iterable left, Iterable right) Returns true if the intersection of two iterables is empty.
|
|
public static Number |
div(Character left, Number right) Divide a Character by a Number. |
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public static Number |
div(Number left, Character right) Divide a Number by a Character. |
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public static Number |
div(Character left, Character right) Divide one Character by another. |
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public static void |
downto(Number self, Number to, Closure closure) Iterates from this number down to the given number, inclusive, decrementing by one each time. |
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public static void |
downto(long self, Number to, Closure closure) Iterates from this number down to the given number, inclusive, decrementing by one each time. |
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public static void |
downto(Long self, Number to, Closure closure) Iterates from this number down to the given number, inclusive, decrementing by one each time. |
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public static void |
downto(float self, Number to, Closure closure) Iterates from this number down to the given number, inclusive, decrementing by one each time. |
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public static void |
downto(Float self, Number to, Closure closure) Iterates from this number down to the given number, inclusive, decrementing by one each time. |
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public static void |
downto(double self, Number to, Closure closure) Iterates from this number down to the given number, inclusive, decrementing by one each time. |
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public static void |
downto(Double self, Number to, Closure closure) Iterates from this number down to the given number, inclusive, decrementing by one each time. |
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public static void |
downto(BigInteger self, Number to, Closure closure) Iterates from this number down to the given number, inclusive, decrementing by one each time. |
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public static void |
downto(BigDecimal self, Number to, Closure closure) Iterates from this number down to the given number, inclusive, decrementing by one each time. |
<T> |
public static SortedSet<T> |
drop(SortedSet<T> self, int num) Drops the given number of elements from the head of this List. |
<T> |
public static List<T> |
drop(List<T> self, int num) Drops the given number of elements from the head of this List. |
<T> |
public static Collection<T> |
drop(Iterable<T> self, int num) Drops the given number of elements from the head of this Iterable. |
<K, V> |
public static Map<K, V> |
drop(Map<K, V> self, int num) Drops the given number of key/value pairs from the head of this map if they are available. |
<T> |
public static Iterator<T> |
drop(Iterator<T> self, int num) Drops the given number of elements from the head of this iterator if they are available. |
<T> |
public static T[] |
drop(T[] self, int num) |
<T> |
public static SortedSet<T> |
dropRight(SortedSet<T> self, int num) Drops the given number of elements from the tail of this SortedSet. |
<T> |
public static List<T> |
dropRight(List<T> self, int num) Drops the given number of elements from the tail of this List. |
<T> |
public static Collection<T> |
dropRight(Iterable<T> self, int num) Drops the given number of elements from the tail of this Iterable. |
<T> |
public static Iterator<T> |
dropRight(Iterator<T> self, int num) Drops the given number of elements from the tail of this Iterator. |
<T> |
public static T[] |
dropRight(T[] self, int num) |
<T> |
public static SortedSet<T> |
dropWhile(SortedSet<T> self, Closure condition) Returns a suffix of this SortedSet where elements are dropped from the front while the given Closure evaluates to true. |
<T> |
public static List<T> |
dropWhile(List<T> self, Closure condition) Returns a suffix of this List where elements are dropped from the front while the given Closure evaluates to true. |
<T> |
public static Collection<T> |
dropWhile(Iterable<T> self, Closure condition) Returns a suffix of this Iterable where elements are dropped from the front while the given closure evaluates to true. |
<K, V> |
public static Map<K, V> |
dropWhile(Map<K, V> self, Closure condition) Create a suffix of the given Map by dropping as many entries as possible from the front of the original Map such that calling the given closure condition evaluates to true when passed each of the dropped entries (or key/value pairs). |
<T> |
public static Iterator<T> |
dropWhile(Iterator<T> self, Closure<?> condition) Creates an Iterator that returns a suffix of the elements from an original Iterator. |
<T> |
public static T[] |
dropWhile(T[] self, Closure<?> condition) |
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public static String |
dump(Object self) Generates a detailed dump string of an object showing its class, hashCode and all accessible fields. |
<T> |
public static T |
each(T self, Closure closure) Iterates through an aggregate type or data structure, passing each item to the given closure. |
<T> |
public static Iterable<T> |
each(Iterable<T> self, Closure closure) Iterates through an Iterable, passing each item to the given closure. |
<T> |
public static Iterator<T> |
each(Iterator<T> self, Closure closure) Iterates through an Iterator, passing each item to the given closure. |
<T> |
public static Collection<T> |
each(Collection<T> self, Closure closure) Iterates through a Collection, passing each item to the given closure. |
<T> |
public static List<T> |
each(List<T> self, Closure closure) Iterates through a List, passing each item to the given closure. |
<T> |
public static Set<T> |
each(Set<T> self, Closure closure) Iterates through a Set, passing each item to the given closure. |
<T> |
public static SortedSet<T> |
each(SortedSet<T> self, Closure closure) Iterates through a SortedSet, passing each item to the given closure. |
<K, V> |
public static Map<K, V> |
each(Map<K, V> self, Closure<?> closure) Allows a Map to be iterated through using a closure. |
<T> |
public static T[] |
each(T[] self, Closure closure) |
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public static void |
eachByte(byte[] self, Closure closure) |
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public static void |
eachByte(Byte[] self, Closure closure) |
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public static void |
eachCombination(Iterable self, Closure<?> function) Applies a function on each combination of the input lists. |
<T> |
public static Iterator<List<T>> |
eachPermutation(Iterable<T> self, Closure closure) Iterates over all permutations of a collection, running a closure for each iteration. |
<T> |
public static T |
eachWithIndex(T self, Closure closure) Iterates through an aggregate type or data structure, passing each item and the item's index (a counter starting at zero) to the given closure. |
<T> |
public static Iterable<T> |
eachWithIndex(Iterable<T> self, Closure closure) Iterates through an iterable type, passing each item and the item's index (a counter starting at zero) to the given closure. |
<T> |
public static Iterator<T> |
eachWithIndex(Iterator<T> self, Closure closure) Iterates through an iterator type, passing each item and the item's index (a counter starting at zero) to the given closure. |
<T> |
public static Collection<T> |
eachWithIndex(Collection<T> self, Closure closure) Iterates through a Collection, passing each item and the item's index (a counter starting at zero) to the given closure. |
<T> |
public static List<T> |
eachWithIndex(List<T> self, Closure closure) Iterates through a List, passing each item and the item's index (a counter starting at zero) to the given closure. |
<T> |
public static Set<T> |
eachWithIndex(Set<T> self, Closure closure) Iterates through a Set, passing each item and the item's index (a counter starting at zero) to the given closure. |
<T> |
public static SortedSet<T> |
eachWithIndex(SortedSet<T> self, Closure closure) Iterates through a SortedSet, passing each item and the item's index (a counter starting at zero) to the given closure. |
<K, V> |
public static Map<K, V> |
eachWithIndex(Map<K, V> self, Closure<?> closure) Allows a Map to be iterated through using a closure. |
<T> |
public static T[] |
eachWithIndex(T[] self, Closure closure) |
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public static boolean |
equals(List left, Object[] right) Determines if the contents of this list are equal to the contents of the given array in the same order. |
|
public static boolean |
equals(List left, List right) Compare the contents of two Lists. |
<T> |
public static boolean |
equals(Set<T> self, Set<T> other) Compare the contents of two Sets for equality using Groovy's coercion rules. |
|
public static boolean |
equals(Map self, Map other) Compares two Maps treating coerced numerical values as identical. |
|
public static boolean |
equals(int[] left, int[] right) |
|
public static boolean |
equals(Object[] left, List right) |
|
public static boolean |
equalsIgnoreZeroSign(Float number, Object other) Compares this object against the specified object returning the same result as Float.equals but returning true if this object and the specified object are both zero and negative zero respectively or vice versa. |
|
public static boolean |
equalsIgnoreZeroSign(Double number, Object other) Compares this object against the specified object returning the same result as Double.equals but returning true if this object and the specified object are both zero and negative zero respectively or vice versa. |
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public static boolean |
every(Object self, Closure predicate) Used to determine if the given predicate closure is valid (i.e. returns true for all items in this data structure).
|
<T> |
public static boolean |
every(Iterator<T> self, Closure predicate) Used to determine if the given predicate closure is valid (i.e. returns true for all items in this iterator).
|
<T> |
public static boolean |
every(Iterable<T> self, Closure predicate) Used to determine if the given predicate closure is valid (i.e. returns true for all items in this iterable).
|
<K, V> |
public static boolean |
every(Map<K, V> self, Closure predicate) Iterates over the entries of a map, and checks whether a predicate is valid for all entries. |
|
public static boolean |
every(Object self) Iterates over every element of a collection, and checks whether all elements are true according to the Groovy Truth.
|
<T> |
public static boolean |
every(T[] self, Closure predicate) |
|
public static Object |
find(Object self, Closure closure) Finds the first value matching the closure condition. |
|
public static Object |
find(Object self) Finds the first item matching the IDENTITY Closure (i.e. matching Groovy truth). |
<T> |
public static T |
find(Collection<T> self, Closure closure) Finds the first value matching the closure condition. |
<T> |
public static T |
find(Collection<T> self) Finds the first item matching the IDENTITY Closure (i.e. matching Groovy truth). |
<K, V> |
public static Map.Entry<K, V> |
find(Map<K, V> self, Closure<?> closure) Finds the first entry matching the closure condition. |
<T> |
public static T |
find(T[] self, Closure condition) |
<K, V> |
public static Map<K, V> |
findAll(Map<K, V> self, Closure closure) Finds all entries matching the closure condition. |
<T> |
public static Set<T> |
findAll(Set<T> self, Closure closure) Finds all values matching the closure condition. |
<T> |
public static List<T> |
findAll(List<T> self, Closure closure) Finds all values matching the closure condition. |
<T> |
public static Collection<T> |
findAll(Collection<T> self, Closure closure) Finds all values matching the closure condition. |
<T> |
public static Set<T> |
findAll(Set<T> self) Finds the items matching the IDENTITY Closure (i.e. matching Groovy truth). |
<T> |
public static List<T> |
findAll(List<T> self) Finds the items matching the IDENTITY Closure (i.e. matching Groovy truth). |
<T> |
public static Collection<T> |
findAll(Collection<T> self) Finds the items matching the IDENTITY Closure (i.e. matching Groovy truth). |
|
public static List |
findAll(Object self, Closure closure) Finds all items matching the closure condition. |
|
public static List |
findAll(Object self) Finds all items matching the IDENTITY Closure (i.e. matching Groovy truth). |
<T> |
public static List<T> |
findAll(T[] self) |
<T> |
public static List<T> |
findAll(T[] self, Closure condition) |
|
public static Collection |
findAll$$bridge(Object self) |
<T> |
public static Collection<T> |
findAll$$bridge(T[] self) |
|
public static Collection |
findAll$$bridge(Object self, Closure closure) |
<T> |
public static Collection<T> |
findAll$$bridge(T[] self, Closure condition) |
|
public static int |
findIndexOf(Object self, Closure condition) Iterates over the elements of an aggregate of items and returns the index of the first item that matches the condition specified in the closure. |
|
public static int |
findIndexOf(Object self, int startIndex, Closure condition) Iterates over the elements of an aggregate of items, starting from a specified startIndex, and returns the index of the first item that matches the condition specified in the closure. |
<T> |
public static int |
findIndexOf(Iterator<T> self, Closure condition) Iterates over the elements of an Iterator and returns the index of the first item that satisfies the condition specified by the closure. |
<T> |
public static int |
findIndexOf(Iterator<T> self, int startIndex, Closure condition) Iterates over the elements of an Iterator, starting from a specified startIndex, and returns the index of the first item that satisfies the condition specified by the closure. |
<T> |
public static int |
findIndexOf(Iterable<T> self, Closure condition) Iterates over the elements of an Iterable and returns the index of the first item that satisfies the condition specified by the closure. |
<T> |
public static int |
findIndexOf(Iterable<T> self, int startIndex, Closure condition) Iterates over the elements of an Iterable, starting from a specified startIndex, and returns the index of the first item that satisfies the condition specified by the closure. |
<T> |
public static int |
findIndexOf(T[] self, Closure condition) |
<T> |
public static int |
findIndexOf(T[] self, int startIndex, Closure condition) |
|
public static List<Number> |
findIndexValues(Object self, Closure condition) Iterates over the elements of an aggregate of items and returns the index values of the items that match the condition specified in the closure. |
|
public static List<Number> |
findIndexValues(Object self, Number startIndex, Closure condition) Iterates over the elements of an aggregate of items, starting from a specified startIndex, and returns the index values of the items that match the condition specified in the closure. |
<T> |
public static List<Number> |
findIndexValues(Iterator<T> self, Closure condition) Iterates over the elements of an Iterator and returns the index values of the items that match the condition specified in the closure. |
<T> |
public static List<Number> |
findIndexValues(Iterator<T> self, Number startIndex, Closure condition) Iterates over the elements of an Iterator, starting from a specified startIndex, and returns the index values of the items that match the condition specified in the closure. |
<T> |
public static List<Number> |
findIndexValues(Iterable<T> self, Closure condition) Iterates over the elements of an Iterable and returns the index values of the items that match the condition specified in the closure. |
<T> |
public static List<Number> |
findIndexValues(Iterable<T> self, Number startIndex, Closure condition) Iterates over the elements of an Iterable, starting from a specified startIndex, and returns the index values of the items that match the condition specified in the closure. |
<T> |
public static List<Number> |
findIndexValues(T[] self, Closure condition) |
<T> |
public static List<Number> |
findIndexValues(T[] self, Number startIndex, Closure condition) |
|
public static int |
findLastIndexOf(Object self, Closure condition) Iterates over the elements of an aggregate of items and returns the index of the last item that matches the condition specified in the closure. |
|
public static int |
findLastIndexOf(Object self, int startIndex, Closure condition) Iterates over the elements of an aggregate of items, starting from a specified startIndex, and returns the index of the last item that matches the condition specified in the closure. |
<T> |
public static int |
findLastIndexOf(Iterator<T> self, Closure condition) Iterates over the elements of an Iterator and returns the index of the last item that matches the condition specified in the closure. |
<T> |
public static int |
findLastIndexOf(Iterator<T> self, int startIndex, Closure condition) Iterates over the elements of an Iterator, starting from a specified startIndex, and returns the index of the last item that matches the condition specified in the closure. |
<T> |
public static int |
findLastIndexOf(Iterable<T> self, Closure condition) Iterates over the elements of an Iterable and returns the index of the last item that matches the condition specified in the closure. |
<T> |
public static int |
findLastIndexOf(Iterable<T> self, int startIndex, Closure condition) Iterates over the elements of an Iterable, starting from a specified startIndex, and returns the index of the last item that matches the condition specified in the closure. |
<T> |
public static int |
findLastIndexOf(T[] self, Closure condition) |
<T> |
public static int |
findLastIndexOf(T[] self, int startIndex, Closure condition) |
|
public static Object |
findResult(Object self, Closure condition) Treats the object as iterable, iterating through the values it represents and returns the first non-null result obtained from calling the closure, otherwise returns null. |
|
public static Object |
findResult(Object self) Treats the object as iterable, iterating through the values it represents and returns the first non-null value, otherwise returns null. |
|
public static Object |
findResult(Object self, Object defaultResult, Closure condition) Treats the object as iterable, iterating through the values it represents and returns the first non-null result obtained from calling the closure, otherwise returns the defaultResult. |
|
public static Object |
findResult(Object self, Object defaultResult) Treats the object as iterable, iterating through the values it represents and returns the first non-null result, otherwise returns the defaultResult. |
<S, T, U extends T, V extends T> |
public static T |
findResult(Iterator<S> self, U defaultResult, Closure<V> condition) Iterates through the Iterator calling the given closure condition for each item but stopping once the first non-null result is found and returning that result. |
<T, U extends T, V extends T> |
public static T |
findResult(Iterator<U> self, V defaultResult) Iterates through the Iterator stopping once the first non-null result is found and returning that result. |
<T, U> |
public static T |
findResult(Iterator<U> self, Closure<T> condition) Iterates through the Iterator calling the given closure condition for each item but stopping once the first non-null result is found and returning that result. |
<T> |
public static T |
findResult(Iterator<T> self) Iterates through the Iterator stopping once the first non-null result is found and returning that result. |
<S, T, U extends T, V extends T> |
public static T |
findResult(Iterable<S> self, U defaultResult, Closure<V> condition) Iterates through the Iterable calling the given closure condition for each item but stopping once the first non-null result is found and returning that result. |
<T, U extends T, V extends T> |
public static T |
findResult(Iterable<U> self, V defaultResult) Iterates through the Iterable calling the given closure condition for each item but stopping once the first non-null result is found and returning that result. |
<T, U> |
public static T |
findResult(Iterable<U> self, Closure<T> condition) Iterates through the Iterable calling the given closure condition for each item but stopping once the first non-null result is found and returning that result. |
<T> |
public static T |
findResult(Iterable<T> self) Iterates through the Iterable stopping once the first non-null result is found and returning that result. |
<T, K, V> |
public static T |
findResult(Map<K, V> self, Closure<T> condition) Returns the first non-null closure result found by passing each map entry to the closure, otherwise null is returned. |
<T, U extends T, V extends T, A, B> |
public static T |
findResult(Map<A, B> self, U defaultResult, Closure<V> condition) Returns the first non-null closure result found by passing each map entry to the closure, otherwise the defaultResult is returned. |
<T> |
public static T |
findResult(T[] self) |
<T, U extends T, V extends T> |
public static T |
findResult(U[] self, V defaultResult) |
<S, T> |
public static T |
findResult(S[] self, Closure<T> condition) |
<S, T, U extends T, V extends T> |
public static T |
findResult(S[] self, U defaultResult, Closure<V> condition) |
<T, U> |
public static Collection<T> |
findResults(Iterable<U> self, Closure<T> filteringTransform) Iterates through the Iterable transforming items using the supplied closure and collecting any non-null results. |
<T> |
public static Collection<T> |
findResults(Iterable<T> self) Iterates through the Iterable collecting any non-null results. |
<T, U> |
public static Collection<T> |
findResults(Iterator<U> self, Closure<T> filteringTransform) Iterates through the Iterator transforming items using the supplied closure and collecting any non-null results. |
<T> |
public static Collection<T> |
findResults(Iterator<T> self) Iterates through the Iterator collecting any non-null results. |
<T, K, V> |
public static Collection<T> |
findResults(Map<K, V> self, Closure<T> filteringTransform) Iterates through the map transforming items using the supplied closure and collecting any non-null results. |
<T> |
public static Collection<T> |
findResults(T[] self) |
<T, U> |
public static Collection<T> |
findResults(U[] self, Closure<T> filteringTransform) |
<T> |
public static T |
first(List<T> self) Returns the first item from the List. |
<T> |
public static T |
first(Iterable<T> self) Returns the first item from the Iterable. |
<T> |
public static T |
first(T[] self) |
<T> |
public static Collection<T> |
flatten(Collection<T> self) Flatten a Collection. |
<T> |
public static Collection<T> |
flatten(Iterable<T> self) Flatten an Iterable. |
<T> |
public static Collection<T> |
flatten(Iterable<T> self, boolean flattenOptionals) Flatten an Iterable. |
<T> |
public static List<T> |
flatten(List<T> self) Flatten a List. |
<T> |
public static Set<T> |
flatten(Set<T> self) Flatten a Set. |
<T> |
public static SortedSet<T> |
flatten(SortedSet<T> self) Flatten a SortedSet. |
<T, E> |
public static Collection<T> |
flatten(Iterable<E> self, Closure<?> flattenUsing) Flatten an Iterable. |
<T, E> |
public static Collection<T> |
flatten(Iterable<E> self, boolean flattenOptionals, Closure<?> flattenUsing) Flatten an Iterable. |
<T> |
public static Collection<T> |
flatten(Optional<T> self) Flatten an Optional. |
|
public static Collection |
flatten(boolean[] self) |
|
public static Collection |
flatten(byte[] self) |
|
public static Collection |
flatten(char[] self) |
|
public static Collection |
flatten(short[] self) |
|
public static Collection |
flatten(int[] self) |
|
public static Collection |
flatten(long[] self) |
|
public static Collection |
flatten(float[] self) |
|
public static Collection |
flatten(double[] self) |
|
public static Collection |
flatten(Object[] self) |
|
public static Collection<Object> |
flattenMany(Iterable<?> self, Closure<?> transform) Flatten an Iterable. |
<K, V> |
public static V |
get(Map<K, V> map, K key, V defaultValue) Looks up an item in a Map for the given key and returns the corresponding value. |
|
public static Object |
getAt(Object self, String property) Allows the subscript operator to be used to lookup dynamic property values. |
<T> |
public static List<T> |
getAt(List<T> self, Range range) Support the range subscript operator for a List. |
<T> |
public static List<T> |
getAt(ListWithDefault<T> self, Collection indices) Select a List of items from an eager or lazy List using a Collection to identify the indices to be selected. |
<T> |
public static List<T> |
getAt(ListWithDefault<T> self, Range range) Support the range subscript operator for an eager or lazy List. |
<T> |
public static List<T> |
getAt(ListWithDefault<T> self, EmptyRange range) Support the range subscript operator for an eager or lazy List. |
<T> |
public static List<T> |
getAt(List<T> self, EmptyRange range) Support the range subscript operator for a List. |
<T> |
public static List<T> |
getAt(List<T> self, Collection indices) Select a List of items from a List using a Collection to identify the indices to be selected. |
<T> |
public static T |
getAt(List<T> self, int idx) Support the subscript operator for a List. |
<T> |
public static T |
getAt(List<T> self, Number idx) Support subscript operator for list access. |
<T> |
public static T |
getAt(Iterator<T> self, int idx) Support the subscript operator for an Iterator. |
<T> |
public static T |
getAt(Iterable<T> self, int idx) Support the subscript operator for an Iterable. |
<K, V> |
public static V |
getAt(Map<K, V> self, Object key) Support the subscript operator for a Map. |
|
public static boolean |
getAt(BitSet self, int index) Support the subscript operator for a Bitset |
|
public static BitSet |
getAt(BitSet self, IntRange range) Support retrieving a subset of a BitSet using a Range |
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public static List |
getAt(Collection coll, String property) Support the subscript operator for Collection. |
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public static List<Boolean> |
getAt(boolean[] self, Range range) |
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public static List<Byte> |
getAt(byte[] self, Range range) |
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public static List<Character> |
getAt(char[] self, Range range) |
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public static List<Short> |
getAt(short[] self, Range range) |
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public static List<Integer> |
getAt(int[] self, Range range) |
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public static List<Long> |
getAt(long[] self, Range range) |
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public static List<Float> |
getAt(float[] self, Range range) |
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public static List<Double> |
getAt(double[] self, Range range) |
<T> |
public static List<T> |
getAt(T[] self, Range range) |
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public static List<Boolean> |
getAt(boolean[] self, IntRange range) |
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public static List<Byte> |
getAt(byte[] self, IntRange range) |
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public static List<Character> |
getAt(char[] self, IntRange range) |
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public static List<Short> |
getAt(short[] self, IntRange range) |
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public static List<Integer> |
getAt(int[] self, IntRange range) |
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public static List<Long> |
getAt(long[] self, IntRange range) |
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public static List<Float> |
getAt(float[] self, IntRange range) |
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public static List<Double> |
getAt(double[] self, IntRange range) |
<T> |
public static List<T> |
getAt(T[] self, IntRange range) |
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public static List<Boolean> |
getAt(boolean[] self, ObjectRange range) |
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public static List<Byte> |
getAt(byte[] self, ObjectRange range) |
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public static List<Character> |
getAt(char[] self, ObjectRange range) |
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public static List<Short> |
getAt(short[] self, ObjectRange range) |
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public static List<Integer> |
getAt(int[] self, ObjectRange range) |
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public static List<Long> |
getAt(long[] self, ObjectRange range) |
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public static List<Float> |
getAt(float[] self, ObjectRange range) |
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public static List<Double> |
getAt(double[] self, ObjectRange range) |
<T> |
public static List<T> |
getAt(T[] self, ObjectRange range) |
<T> |
public static List<T> |
getAt(T[] self, EmptyRange range) |
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public static List<Boolean> |
getAt(boolean[] self, Collection indices) |
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public static List<Byte> |
getAt(byte[] self, Collection indices) |
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public static List<Character> |
getAt(char[] self, Collection indices) |
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public static List<Short> |
getAt(short[] self, Collection indices) |
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public static List<Integer> |
getAt(int[] self, Collection indices) |
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public static List<Long> |
getAt(long[] self, Collection indices) |
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public static List<Float> |
getAt(float[] self, Collection indices) |
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public static List<Double> |
getAt(double[] self, Collection indices) |
<T> |
public static List<T> |
getAt(T[] self, Collection indices) |
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public static Groovydoc |
getGroovydoc(AnnotatedElement holder) Gets runtime groovydoc. |
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public static IntRange |
getIndices(Collection self) Returns indices of the collection. |
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public static IntRange |
getIndices(boolean[] self) |
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public static IntRange |
getIndices(byte[] self) |
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public static IntRange |
getIndices(char[] self) |
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public static IntRange |
getIndices(short[] self) |
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public static IntRange |
getIndices(int[] self) |
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public static IntRange |
getIndices(long[] self) |
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public static IntRange |
getIndices(float[] self) |
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public static IntRange |
getIndices(double[] self) |
<T> |
public static IntRange |
getIndices(T[] self) |
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public static URL |
getLocation(Class self) Gets the url of the jar file/source file containing the specified class. |
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public static MetaClass |
getMetaClass(Class c) Adds a "metaClass" property to all class objects so you can use the syntax String.metaClass.myMethod = { println "foo" } |
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public static MetaClass |
getMetaClass(Object obj) Obtains a MetaClass for an object either from the registry or in the case of a GroovyObject from the object itself. |
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public static MetaClass |
getMetaClass(GroovyObject obj) Obtains a MetaClass for an object either from the registry or in the case of a GroovyObject from the object itself. |
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public static List<PropertyValue> |
getMetaPropertyValues(Object self) Retrieves the list of MetaProperty objects for 'self' and wraps it in a list of PropertyValue objects that additionally provide the value for each property of 'self'. |
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public static Map<String, Object> |
getProperties(Object self) Convenience method that calls getMetaPropertyValues(java.lang.Object)(self) and provides the data in form of simple key/value pairs, i.e. without type() information. |
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public static ClassLoader |
getRootLoader(ClassLoader self) Iterates through the classloader parents until it finds a loader with a class named "org.codehaus.groovy.tools.RootLoader". |
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public static Collection |
grep(Object self, Object filter) Iterates over the collection of items which this Object represents and returns each item that matches the given filter - calling the isCase(java.lang.Object, java.lang.Object)
method used by switch statements. |
<T> |
public static Collection<T> |
grep(Collection<T> self, Object filter) Iterates over the collection of items and returns each item that matches the given filter - calling the isCase(java.lang.Object, java.lang.Object)
method used by switch statements. method can be used with different
kinds of filters like regular expressions, classes, ranges etc.
|
<T> |
public static List<T> |
grep(List<T> self, Object filter) Iterates over the collection of items and returns each item that matches the given filter - calling the isCase(java.lang.Object, java.lang.Object)
method used by switch statements. |
<T> |
public static Set<T> |
grep(Set<T> self, Object filter) Iterates over the collection of items and returns each item that matches the given filter - calling the isCase(java.lang.Object, java.lang.Object)
method used by switch statements. |
|
public static Collection |
grep(Object self) Iterates over the collection of items which this Object represents and returns each item that matches using the IDENTITY Closure as a filter - effectively returning all elements which satisfy Groovy truth. |
<T> |
public static Collection<T> |
grep(Collection<T> self) Iterates over the collection returning each element that matches using the IDENTITY Closure as a filter - effectively returning all elements which satisfy Groovy truth. |
<T> |
public static List<T> |
grep(List<T> self) Iterates over the collection returning each element that matches using the IDENTITY Closure as a filter - effectively returning all elements which satisfy Groovy truth. |
<T> |
public static Set<T> |
grep(Set<T> self) Iterates over the collection returning each element that matches using the IDENTITY Closure as a filter - effectively returning all elements which satisfy Groovy truth. |
<T> |
public static Collection<T> |
grep(T[] self) |
<T> |
public static Collection<T> |
grep(T[] self, Object filter) |
<K, T> |
protected static void |
groupAnswer(Map<K, List<T>> answer, T element, K value) Groups the current element according to the value |
<K, T> |
public static Map<K, List<T>> |
groupBy(Iterable<T> self, Closure<K> closure) Sorts all Iterable members into groups determined by the supplied mapping closure. |
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public static Map |
groupBy(Iterable self, Object closures) Sorts all Iterable members into (sub)groups determined by the supplied mapping closures. |
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public static Map |
groupBy(Iterable self, List<Closure> closures) Sorts all Iterable members into (sub)groups determined by the supplied mapping closures. |
<G, K, V> |
public static Map<G, Map<K, V>> |
groupBy(Map<K, V> self, Closure<G> closure) Groups the members of a map into sub maps determined by the supplied mapping closure. |
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public static Map<Object, Map> |
groupBy(Map self, Object closures) Groups the members of a map into sub maps determined by the supplied mapping closures. |
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public static Map<Object, Map> |
groupBy(Map self, List<Closure> closures) Groups the members of a map into sub maps determined by the supplied mapping closures. |
<K, T> |
public static Map<K, List<T>> |
groupBy(T[] self, Closure<K> closure) |
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public static Map |
groupBy(Object[] self, Object closures) |
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public static Map |
groupBy(Object[] self, List<Closure> closures) |
<G, K, V> |
public static Map<G, List<Map.Entry<K, V>>> |
groupEntriesBy(Map<K, V> self, Closure<G> closure) Groups all map entries into groups determined by the supplied mapping closure. |
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public boolean |
hasNext() |
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public static MetaProperty |
hasProperty(Object self, String name) |
<T> |
public static T |
head(Iterable<T> self) Returns the first item from the Iterable. |
<T> |
public static T |
head(List<T> self) Returns the first item from the List. |
<T> |
public static T |
head(T[] self) |
<T, U> |
public static T |
identity(U self, Closure<T> closure) Allows the closure to be called for the object reference self. |
|
public static Boolean |
implies(Boolean left, Boolean right) Logical implication of two boolean operands. |
<E> |
public static Map<Integer, E> |
indexed(Iterable<E> self) Zips an Iterable with indices in (index, value) order. |
<E> |
public static Map<Integer, E> |
indexed(Iterable<E> self, int offset) Zips an Iterable with indices in (index, value) order. |
<E> |
public static Iterator<Tuple2<Integer, E>> |
indexed(Iterator<E> self) Zips an iterator with indices in (index, value) order. |
<E> |
public static Iterator<Tuple2<Integer, E>> |
indexed(Iterator<E> self, int offset) Zips an iterator with indices in (index, value) order. |
|
public static Map<Integer, Integer> |
indexed(int[] self) |
|
public static Map<Integer, Long> |
indexed(long[] self) |
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public static Map<Integer, Double> |
indexed(double[] self) |
|
public static Map<Integer, Integer> |
indexed(int[] self, int offset) |
|
public static Map<Integer, Long> |
indexed(long[] self, int offset) |
|
public static Map<Integer, Double> |
indexed(double[] self, int offset) |
<T> |
public static Collection<T> |
init(Iterable<T> self) Returns the items from the Iterable excluding the last item. |
<T> |
public static List<T> |
init(List<T> self) Returns the items from the List excluding the last item. |
<T> |
public static SortedSet<T> |
init(SortedSet<T> self) Returns the items from the SortedSet excluding the last item. |
<T> |
public static Iterator<T> |
init(Iterator<T> self) Returns an Iterator containing all the items from this iterator except the last one. |
<T> |
public static T[] |
init(T[] self) |
<T> |
public static List<List<T>> |
inits(Iterable<T> self) Calculates the init values of this Iterable: the first value will be this list of all items from the iterable and the final one will be an empty list, with the intervening values the results of successive applications of init on the items. |
<T, V extends T> |
public static T |
inject(Object self, Closure<V> closure) Iterates through the given object, passing the first two elements to the closure. |
<E extends T, T, V extends T> |
public static T |
inject(Iterable<E> self, Closure<V> closure) Iterates through the given object, passing the first two elements to the closure. |
<T, U extends T, V extends T> |
public static T |
inject(Object self, U initialValue, Closure<V> closure) Iterates through the given object, passing in the initial value to the closure along with the first item. |
<E, T, U extends T, V extends T> |
public static T |
inject(Iterable<E> self, U initialValue, Closure<V> closure) Iterates through the given object, passing in the initial value to the 2-arg closure along with the first item. |
<E, T, U extends T, V extends T> |
public static T |
inject(Iterator<E> self, U initialValue, Closure<V> closure) Iterates through the given iterator, passing in the initial value to the closure along with the first item. |
<K, V, T, U extends T, W extends T> |
public static T |
inject(Map<K, V> self, U initialValue, Closure<W> closure) Iterates through the given map, passing in the initial value to the 2-arg Closure along with the first item (or 3-arg Closure along with the first key and value). |
<E extends T, T, V extends T> |
public static T |
inject(E[] self, Closure<V> closure) |
<E extends T, T, V extends T> |
public static T |
inject(Collection<E> self, Closure<V> closure) |
<E, T, U extends T, V extends T> |
public static T |
inject(E[] self, U initialValue, Closure<V> closure) |
<E, T, U extends T, V extends T> |
public static T |
inject(Collection<E> self, U initialValue, Closure<V> closure) |
|
public static String |
inspect(Object self) Inspects returns the String that matches what would be typed into a terminal to create this object. |
|
public static Number |
intdiv(Character left, Number right) Integer Divide a Character by a Number. |
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public static Number |
intdiv(Number left, Character right) Integer Divide a Number by a Character. |
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public static Number |
intdiv(Character left, Character right) Integer Divide two Characters. |
|
public static Number |
intdiv(Number left, Number right) Integer Divide two Numbers. |
<T> |
public static Collection<T> |
intersect(Collection<T> left, Collection<T> right) Create a Collection composed of the intersection of both collections. |
<T> |
public static Collection<T> |
intersect(Collection<T> left, Collection<T> right, Comparator<? super T> comparator) Create a Collection composed of the intersection of both collections. |
<T> |
public static Collection<T> |
intersect(Iterable<T> left, Iterable<T> right) Create a Collection composed of the intersection of both iterables. |
<T> |
public static Collection<T> |
intersect(Iterable<T> left, Iterable<T> right, Comparator<? super T> comparator) Create a Collection composed of the intersection of both iterables. |
<T> |
public static Collection<T> |
intersect(Iterable<T> left, Iterable<T> right, Closure condition) Create a Collection composed of the intersection of both iterables. |
<T> |
public static List<T> |
intersect(List<T> left, Iterable<T> right) Create a List composed of the intersection of a List and an Iterable. |
<T> |
public static List<T> |
intersect(List<T> left, Iterable<T> right, Comparator<? super T> comparator) Create a List composed of the intersection of a List and an Iterable. |
<T> |
public static Set<T> |
intersect(Set<T> left, Iterable<T> right) Create a Set composed of the intersection of a Set and an Iterable. |
<T> |
public static Set<T> |
intersect(Set<T> left, Iterable<T> right, Comparator<? super T> comparator) Create a Set composed of the intersection of a Set and an Iterable. |
<T> |
public static SortedSet<T> |
intersect(SortedSet<T> left, Iterable<T> right) Create a SortedSet composed of the intersection of a SortedSet and an Iterable. |
<T> |
public static SortedSet<T> |
intersect(SortedSet<T> left, Iterable<T> right, Comparator<? super T> comparator) Create a SortedSet composed of the intersection of a SortedSet and an Iterable. |
<K, V> |
public static Map<K, V> |
intersect(Map<K, V> left, Map<K, V> right) Create a Map composed of the intersection of both maps. |
|
public static Object |
invokeMethod(Object object, String method, Object arguments) Provide a dynamic method invocation method which can be overloaded in classes to implement dynamic proxies easily. |
|
public static boolean |
is(Object self, Object other) Identity check. |
|
public static Boolean |
isAtLeast(BigDecimal left, BigDecimal right) Compare a BigDecimal to another. |
|
public static Boolean |
isAtLeast(BigDecimal left, String right) Compare a BigDecimal to a String representing a number. |
|
public static boolean |
isCase(Object caseValue, Object switchValue) Method for overloading the behavior of the 'case' method in switch statements. |
|
public static boolean |
isCase(Class caseValue, Object switchValue) Special 'Case' implementation for Class, which allows testing whether some switch value is assignable from the given case class. |
|
public static boolean |
isCase(Collection caseValue, Object switchValue) 'Case' implementation for collections which tests if the 'switch' operand is contained in any of the 'case' values. |
|
public static boolean |
isCase(Iterable caseValue, Object switchValue) 'Case' implementation for iterable types which tests if the 'switch' operand is contained in any of the 'case' values. |
|
public static boolean |
isCase(Map caseValue, Object switchValue) 'Case' implementation for maps which tests the groovy truth value obtained using the 'switch' operand as key. |
|
public static boolean |
isCase(Number caseValue, Number switchValue) Special 'case' implementation for all numbers, which delegates to the compareTo() method for comparing numbers of different
types. |
|
public static boolean |
isDigit(Character self) Determines if a character is a digit. |
|
public static boolean |
isEmpty(Iterable self) Check whether an Iterable has elements
def items = [1] def iterable = { [ hasNext:{ ! |
|
public static boolean |
isLetter(Character self) Determines if a character is a letter. |
|
public static boolean |
isLetterOrDigit(Character self) Determines if a character is a letter or digit. |
|
public static boolean |
isLowerCase(Character self) Determines if a Character is lowercase. |
|
public static boolean |
isNotCase(Number caseValue, Number switchValue)
|
|
public static boolean |
isNotCase(Object caseValue, Object switchValue)
|
|
public static boolean |
isNotCase(Class<?> caseValue, Object switchValue)
|
|
public static boolean |
isNotCase(Closure<?> caseValue, Object switchValue)
|
|
public static boolean |
isNotCase(Collection<?> caseValue, Object switchValue)
|
|
public static boolean |
isNotCase(Map<?, ?> caseValue, Object switchValue)
|
|
public static boolean |
isUpperCase(Character self) Determines if a Character is uppercase. |
|
public static boolean |
isWhitespace(Character self) Determines if a character is a whitespace character. |
|
public static Iterator |
iterator(Object self) Creates an Iterator for the given Object by converting it to a Collection. |
<T> |
public static Iterator<T> |
iterator(Iterator<T> self) Supports 'duck-typing' when trying to get an Iterator for each element of a Collection, some of which may already be an Iterator. |
<T> |
public static Iterator<T> |
iterator(Enumeration<T> self) Allows an Enumeration to behave like an Iterable. |
<K, V> |
public static Iterator<Map.Entry<K, V>> |
iterator(Map<K, V> self) Returns an Iterator for the given Map's entry set. |
<T> |
public static Iterator<T> |
iterator(T[] self) |
|
public static String |
join(Iterator<?> self) Concatenates the toString() representation of each item from
the Iterator. |
|
public static String |
join(Iterable<?> self) Concatenates the toString() representation of each item from
the Iterable. |
|
public static String |
join(Iterator<?> self, String separator) Concatenates the toString() representation of each item from
the Iterator, with the given String as a separator between each item. |
|
public static String |
join(Iterable<?> self, String separator) Concatenates the toString() representation of each item from
the Iterable, with the given String as a separator between each item. |
|
public static String |
join(boolean[] self, String separator) |
|
public static String |
join(byte[] self, String separator) |
|
public static String |
join(char[] self, String separator) |
|
public static String |
join(short[] self, String separator) |
|
public static String |
join(int[] self, String separator) |
|
public static String |
join(long[] self, String separator) |
|
public static String |
join(float[] self, String separator) |
|
public static String |
join(double[] self, String separator) |
<T> |
public static String |
join(T[] self, String separator) |
<T> |
public static T |
last(List<T> self) Returns the last item from the List. |
<T> |
public static T |
last(Deque<T> self) An optimized version of last(List). |
<T> |
public static T |
last(Iterable<T> self) Returns the last item from the Iterable. |
<T> |
public static T |
last(T[] self) |
<T> |
public static Collection<T> |
leftShift(Collection<T> self, T value) Overloads the left shift operator to provide an easy way to append objects to a Collection. |
<T> |
public static List<T> |
leftShift(List<T> self, T value) Overloads the left shift operator to provide an easy way to append objects to a List. |
<T> |
public static Set<T> |
leftShift(Set<T> self, T value) Overloads the left shift operator to provide an easy way to append objects to a Set. |
<T> |
public static SortedSet<T> |
leftShift(SortedSet<T> self, T value) Overloads the left shift operator to provide an easy way to append objects to a SortedSet. |
<T> |
public static BlockingQueue<T> |
leftShift(BlockingQueue<T> self, T value) Overloads the left shift operator to provide an easy way to append objects to a BlockingQueue. |
<K, V> |
public static Map<K, V> |
leftShift(Map<K, V> self, Map.Entry<K, V> entry) Overloads the left shift operator to provide an easy way to append Map.Entry values to a Map. |
<K, V> |
public static Map<K, V> |
leftShift(Map<K, V> self, Map<K, V> other) Overloads the left shift operator to provide an easy way to put one maps entries into another map. |
|
public static Number |
leftShift(Number self, Number operand) Implementation of the left shift operator for integral types. |
|
public static BitSet |
leftShift(BitSet self, Number operand) Implementation of the left shift operator for BitSets, returning a new BitSet and leaving the original unchanged. |
<T> |
public static T |
max(Iterable<T> self) Adds max() method to Iterable objects. |
<T> |
public static T |
max(Iterator<T> self) Adds max() method to Iterator objects. |
<T> |
public static T |
max(Iterable<T> self, Comparator<? super T> comparator) Selects the maximum value found in the Iterable using the given comparator. |
<T> |
public static T |
max(Iterator<T> self, Comparator<? super T> comparator) Selects the maximum value found from the Iterator using the given comparator. |
<T> |
public static T |
max(Iterable<T> self, Closure closure) Selects the item in the iterable which when passed as a parameter to the supplied closure returns the maximum value. |
<T> |
public static T |
max(Iterator<T> self, Closure closure) Selects the maximum value found from the Iterator using the closure to determine the correct ordering. |
<K, V> |
public static Map.Entry<K, V> |
max(Map<K, V> self, Closure closure) Selects an entry in the map having the maximum calculated value as determined by the supplied closure. |
|
public static int |
max(int[] self) |
|
public static long |
max(long[] self) |
|
public static double |
max(double[] self) |
<T> |
public static T |
max(T[] self) |
<T> |
public static T |
max(T[] self, Comparator<? super T> comparator) |
<T> |
public static T |
max(T[] self, Closure closure) |
|
public static MetaClass |
metaClass(Class self, Closure closure) Sets/updates the metaclass for a given class to a closure. |
|
public static MetaClass |
metaClass(Object self, Closure closure) Sets/updates the metaclass for a given object to a closure. |
<T> |
public static T |
min(Iterable<T> self) Adds min() method to Collection objects. |
<T> |
public static T |
min(Iterator<T> self) Adds min() method to Iterator objects. |
<T> |
public static T |
min(Iterable<T> self, Comparator<? super T> comparator) Selects the minimum value found in the Iterable using the given comparator. |
<T> |
public static T |
min(Iterator<T> self, Comparator<? super T> comparator) Selects the minimum value found from the Iterator using the given comparator. |
<T> |
public static T |
min(Iterable<T> self, Closure closure) Selects the item in the iterable which when passed as a parameter to the supplied closure returns the minimum value. |
<T> |
public static T |
min(Iterator<T> self, Closure closure) Selects the minimum value found from the Iterator using the closure to determine the correct ordering. |
<K, V> |
public static Map.Entry<K, V> |
min(Map<K, V> self, Closure closure) Selects an entry in the map having the minimum calculated value as determined by the supplied closure. |
|
public static int |
min(int[] self) |
|
public static long |
min(long[] self) |
|
public static double |
min(double[] self) |
<T> |
public static T |
min(T[] self) |
<T> |
public static T |
min(T[] self, Comparator<? super T> comparator) |
<T> |
public static T |
min(T[] self, Closure closure) |
<T> |
public static Set<T> |
minus(Set<T> self, Collection<?> removeMe) Create a Set composed of the elements of the first Set minus the elements of the given Collection. |
<T> |
public static Set<T> |
minus(Set<T> self, Iterable<?> removeMe) Create a Set composed of the elements of the first Set minus the elements from the given Iterable. |
<T> |
public static Set<T> |
minus(Set<T> self, Object removeMe) Create a Set composed of the elements of the first Set minus the given element. |
<T> |
public static SortedSet<T> |
minus(SortedSet<T> self, Collection<?> removeMe) Create a SortedSet composed of the elements of the first SortedSet minus the elements of the given Collection. |
<T> |
public static SortedSet<T> |
minus(SortedSet<T> self, Iterable<?> removeMe) Create a SortedSet composed of the elements of the first SortedSet minus the elements of the given Iterable. |
<T> |
public static SortedSet<T> |
minus(SortedSet<T> self, Object removeMe) Create a SortedSet composed of the elements of the first SortedSet minus the given element. |
<T> |
public static List<T> |
minus(List<T> self, Collection<?> removeMe) Create a List composed of the elements of the first list minus every occurrence of elements of the given Collection. |
<T> |
public static Collection<T> |
minus(Collection<T> self, Collection<?> removeMe) Create a new Collection composed of the elements of the first Collection minus every occurrence of elements of the given Collection. |
<T> |
public static List<T> |
minus(List<T> self, Iterable<?> removeMe) Create a new List composed of the elements of the first List minus every occurrence of elements of the given Iterable. |
<T> |
public static Collection<T> |
minus(Iterable<T> self, Iterable<?> removeMe) Create a new Collection composed of the elements of the first Iterable minus every occurrence of elements of the given Iterable. |
<T> |
public static Collection<T> |
minus(Iterable<T> self, Iterable<?> removeMe, Closure condition) Create a new Collection composed of the elements of the first Iterable minus every matching occurrence as determined by the condition closure of elements of the given Iterable. |
<T> |
public static Collection<T> |
minus(Iterable<T> self, Iterable<?> removeMe, Comparator<? super T> comparator) Create a new Collection composed of the elements of the first Iterable minus every matching occurrence as determined by the condition comparator of elements of the given Iterable. |
<T> |
public static List<T> |
minus(List<T> self, Object removeMe) Create a new List composed of the elements of the first List minus every occurrence of the given element to remove. |
<T> |
public static Collection<T> |
minus(Iterable<T> self, Object removeMe) Create a new Collection composed of the elements of the first Iterable minus every occurrence of the given element to remove. |
<K, V> |
public static Map<K, V> |
minus(Map<K, V> self, Map removeMe) Create a Map composed of the entries of the first map minus the entries of the given map. |
|
public static Number |
minus(Character left, Number right) Subtract a Number from a Character. |
|
public static Number |
minus(Number left, Character right) Subtract a Character from a Number. |
|
public static Number |
minus(Character left, Character right) Subtract one Character from another. |
<T> |
public static T[] |
minus(T[] self, Iterable removeMe) |
<T> |
public static T[] |
minus(T[] self, Object[] removeMe) |
<T> |
public static T[] |
minus(T[] self, Object removeMe) |
|
public static void |
mixin(MetaClass self, List<Class> categoryClasses) Extend object with category methods. |
|
public static void |
mixin(Class self, List<Class> categoryClasses) Extend class globally with category methods. |
|
public static void |
mixin(Class self, Class categoryClass) Extend class globally with category methods. |
|
public static void |
mixin(Class self, Class[] categoryClass) Extend class globally with category methods. |
|
public static void |
mixin(MetaClass self, Class categoryClass) Extend class globally with category methods. |
|
public static void |
mixin(MetaClass self, Class[] categoryClass) Extend class globally with category methods. |
|
public static Number |
mod(Number left, Number right) Performs a division modulus operation. |
<T> |
public static Collection<T> |
multiply(Iterable<T> self, Number factor) Create a Collection composed of the elements of this Iterable, repeated a certain number of times. |
<T> |
public static List<T> |
multiply(List<T> self, Number factor) Create a List composed of the elements of this Iterable, repeated a certain number of times. |
|
public static Number |
multiply(Character left, Number right) Multiply a Character by a Number. |
|
public static Number |
multiply(Number left, Character right) Multiply a Number by a Character. |
|
public static Number |
multiply(Character left, Character right) Multiply two Characters. |
|
public static Number |
multiply(BigDecimal left, Double right) Multiply a BigDecimal and a Double. |
|
public static Number |
multiply(BigDecimal left, BigInteger right) Multiply a BigDecimal and a BigInteger. |
<T> |
public static T |
newInstance(Class<T> c) Convenience method to dynamically create a new instance of this class. |
<T> |
public static T |
newInstance(Class<T> c, Object[] args) Helper to construct a new instance from the given arguments. |
|
public T |
next() |
|
public static Character |
next(Character self) Increment a Character by one. |
|
public static Number |
next(Number self) Increment a Number by one. |
|
public static int |
numberAwareCompareTo(Comparable self, Comparable other) Provides a method that compares two comparables using Groovy's default number aware comparator. |
|
public static Number |
or(Number left, Number right) Bitwise OR together two numbers. |
|
public static BitSet |
or(BitSet left, BitSet right) Bitwise OR together two BitSets. |
|
public static Boolean |
or(Boolean left, Boolean right) Logical disjunction of two boolean operators |
<T> |
public static Set<T> |
or(Set<T> left, Iterable<T> right) Create a Set as a union of a Set and an Iterable. |
<T> |
public static SortedSet<T> |
or(SortedSet<T> left, Iterable<T> right) Create a SortedSet as a union of a SortedSet and an Iterable. |
<T> |
public static Set<List<T>> |
permutations(Iterable<T> self) Finds all permutations of an iterable. |
<T, V> |
public static List<V> |
permutations(Iterable<T> self, Closure<V> function) Finds all permutations of an iterable, applies a function to each permutation and collects the result into a list. |
<T> |
public static Collection<T> |
plus(Collection<T> left, Collection<T> right) Create a Collection as a union of two collections. |
<T> |
public static Collection<T> |
plus(Iterable<T> left, Iterable<T> right) Create a Collection as a union of two iterables. |
<T> |
public static Collection<T> |
plus(Collection<T> left, Iterable<T> right) Create a Collection as a union of a Collection and an Iterable. |
<T> |
public static List<T> |
plus(List<T> left, Iterable<T> right) Create a List as a union of a List and an Iterable. |
<T> |
public static List<T> |
plus(List<T> left, Collection<T> right) Create a List as a union of a List and a Collection. |
<T> |
public static Set<T> |
plus(Set<T> left, Iterable<T> right) Create a Set as a union of a Set and an Iterable. |
<T> |
public static Set<T> |
plus(Set<T> left, Collection<T> right) Create a Set as a union of a Set and a Collection. |
<T> |
public static SortedSet<T> |
plus(SortedSet<T> left, Iterable<T> right) Create a SortedSet as a union of a SortedSet and an Iterable. |
<T> |
public static SortedSet<T> |
plus(SortedSet<T> left, Collection<T> right) Create a SortedSet as a union of a SortedSet and a Collection. |
<T> |
public static List<T> |
plus(List<T> self, int index, T[] items) Creates a new List by inserting all the elements in the specified array to the elements from the original List at the specified index. |
<T> |
public static List<T> |
plus(List<T> self, int index, List<T> additions) Creates a new List by inserting all the elements in the given additions List to the elements from the original List at the specified index. |
<T> |
public static List<T> |
plus(List<T> self, int index, Iterable<T> additions) Creates a new List by inserting all the elements in the given Iterable to the elements from this List at the specified index. |
<T> |
public static Collection<T> |
plus(Collection<T> left, T right) Create a collection as a union of a Collection and an Object. |
<T> |
public static Collection<T> |
plus(Iterable<T> left, T right) Create a collection as a union of an Iterable and an Object. |
<T> |
public static List<T> |
plus(List<T> left, T right) Create a List as a union of a List and an Object. |
<T> |
public static Set<T> |
plus(Set<T> left, T right) Create a Set as a union of a Set and an Object. |
<T> |
public static SortedSet<T> |
plus(SortedSet<T> left, T right) Create a SortedSet as a union of a SortedSet and an Object. |
<K, V> |
public static Map<K, V> |
plus(Map<K, V> left, Map<K, V> right) Returns a new Map containing all entries from left and right ,
giving precedence to right . |
<K, V> |
public static Map<K, V> |
plus(Map<K, V> self, Collection<? extends Map.Entry<? extends K, ? extends V>> entries) Returns a new Map containing all entries from self and entries ,
giving precedence to entries . |
|
public static Number |
plus(Character left, Number right) Add a Character and a Number. |
|
public static Number |
plus(Number left, Character right) Add a Number and a Character. |
|
public static Number |
plus(Character left, Character right) Add one Character to another. |
|
public static String |
plus(Map left, String right) Appends a String to the literal of the Map instance. |
|
public static String |
plus(Map left, GString right) Appends a GString to the literal of the Map instance. |
<T> |
public static T[] |
plus(T[] left, Collection<?> right) |
<T> |
public static T[] |
plus(T[] left, Iterable<?> right) |
<T> |
public static T[] |
plus(T[] left, Object[] right) |
<T> |
public static T[] |
plus(T[] left, Object right) |
<T> |
public static T |
pop(List<T> self) Removes the initial item from the List. |
|
public static Number |
power(Number self, Number exponent) Power of a Number to a certain exponent. |
|
public static Number |
power(BigDecimal self, Integer exponent) Power of a BigDecimal to an integer certain exponent. |
|
public static Number |
power(BigInteger self, Integer exponent) Power of a BigInteger to an integer certain exponent. |
|
public static Number |
power(Integer self, Integer exponent) Power of an integer to an integer certain exponent. |
|
public static Number |
power(Long self, Integer exponent) Power of a long to an integer certain exponent. |
|
public static BigInteger |
power(BigInteger self, BigInteger exponent) Power of a BigInteger to a BigInteger certain exponent. |
|
public static Character |
previous(Character self) Decrement a Character by one. |
|
public static Number |
previous(Number self) Decrement a Number by one. |
|
protected static Object |
primitiveArrayGet(Object self, int idx) Implements the getAt(int) method for primitive type arrays. |
|
protected static List |
primitiveArrayGet(Object self, Range range) Implements the getAt(Range) method for primitive type arrays. |
|
protected static List |
primitiveArrayGet(Object self, Collection indices) Implements the getAt(Collection) method for primitive type arrays. |
|
protected static Object |
primitiveArrayPut(Object self, int idx, Object newValue) Implements the putAt(int) method for primitive type arrays. |
|
public static void |
print(Object self, Object value) Print a value formatted Groovy style to self if it is a Writer, otherwise to the standard output stream. |
|
public static void |
print(PrintWriter self, Object value) Print a value formatted Groovy style to the print writer. |
|
public static void |
print(PrintStream self, Object value) Print a value formatted Groovy style to the print stream. |
|
public static void |
print(Object self, PrintWriter out) Print to a console in interactive format. |
|
public static void |
print(Closure self, Object value) Print a value to the standard output stream. |
|
public static void |
printf(Object self, String format, Object[] values) Printf to the standard output stream. |
|
public static void |
printf(Closure self, String format, Object[] values) Printf 0 or more values to the standard output stream using a format string. |
|
public static void |
printf(Closure self, String format, Object value) Printf a value to the standard output stream using a format string. |
|
public static void |
printf(Object self, String format, Object arg) Prints a formatted string using the specified format string and arguments. |
|
public static void |
println(Object self) Print a linebreak to the standard output stream. |
|
public static void |
println(Closure self) Print a linebreak to the standard output stream. |
|
public static void |
println(Object self, Object value) Print a value formatted Groovy style (followed by a newline) to self if it is a Writer, otherwise to the standard output stream. |
|
public static void |
println(PrintWriter self, Object value) Print a value formatted Groovy style (followed by a newline) to the print writer. |
|
public static void |
println(PrintStream self, Object value) Print a value formatted Groovy style (followed by a newline) to the print stream. |
|
public static void |
println(Closure self, Object value) Print a value (followed by a newline) to the standard output stream. |
|
public static void |
println(Object self, PrintWriter out) Print to a console in interactive format. |
<T> |
public static boolean |
push(List<T> self, T value) Prepends an item to the start of the List. |
<K, V> |
public static Map<K, V> |
putAll(Map<K, V> self, Collection<? extends Map.Entry<? extends K, ? extends V>> entries) Provides an easy way to append multiple Map.Entry values to a Map. |
|
public static void |
putAt(Object self, String property, Object newValue) Allows the subscript operator to be used to set dynamically named property values. |
<T> |
public static void |
putAt(List<T> self, int idx, T value) A helper method to allow lists to work with subscript operators. |
<T> |
public static void |
putAt(List<T> self, Number idx, T value) Support subscript operator for list modification. |
|
public static void |
putAt(List self, EmptyRange range, Object value) A helper method to allow lists to work with subscript operators. |
|
public static void |
putAt(List self, EmptyRange range, Collection value) A helper method to allow lists to work with subscript operators. |
|
public static void |
putAt(List self, IntRange range, Collection col) List subscript assignment operator when given a range as the index and the assignment operand is a collection. |
|
public static void |
putAt(List self, IntRange range, Object value) List subscript assignment operator when given a range as the index. |
|
public static void |
putAt(List self, List splice, Collection values) A helper method to allow lists to work with subscript operators. |
|
public static void |
putAt(List self, List splice, Object value) A helper method to allow lists to work with subscript operators. |
<K, V> |
public static V |
putAt(Map<K, V> self, K key, V value) A helper method to allow maps to work with subscript operators |
|
public static void |
putAt(BitSet self, IntRange range, boolean value) Support assigning a range of values with a single assignment statement. |
|
public static void |
putAt(BitSet self, int index, boolean value) Support subscript-style assignment for a BitSet. |
|
public static void |
putAt(List self, List splice, List values) |
|
public static Number |
remainder(Number left, Number right) Performs a division modulus operation. |
|
public void |
remove() |
|
public static boolean |
removeAll(Collection self, Object[] items) Modifies this collection by removing its elements that are contained within the specified object array. |
<T> |
public static boolean |
removeAll(Collection<T> self, Closure condition) Modifies this collection by removing the elements that are matched according to the specified closure condition. |
<K, V> |
public static boolean |
removeAll(Map<K, V> self, Closure condition) Modifies this map by removing the elements that are matched according to the specified closure condition. |
<E> |
public static E |
removeAt(List<E> self, int index) Modifies this list by removing the element at the specified position in this list. |
<E> |
public static boolean |
removeElement(Collection<E> self, Object o) Modifies this collection by removing a single instance of the specified element from this collection, if it is present. |
<T> |
public static T |
removeLast(List<T> self) Removes the last item from the List. |
|
public static List<MetaMethod> |
respondsTo(Object self, String name, Object[] argTypes) |
|
public static List<MetaMethod> |
respondsTo(Object self, String name) |
|
public static boolean |
retainAll(Collection self, Object[] items) Modifies this collection so that it retains only its elements that are contained in the specified array. |
<T> |
public static boolean |
retainAll(Collection<T> self, Closure condition) Modifies this collection so that it retains only its elements that are matched according to the specified closure condition. |
<K, V> |
public static boolean |
retainAll(Map<K, V> self, Closure condition) Modifies this map so that it retains only its elements that are matched according to the specified closure condition. |
<T> |
public static List<T> |
reverse(List<T> self) Creates a new List with the identical contents to this list but in reverse order. |
<T> |
public static List<T> |
reverse(List<T> self, boolean mutate) Reverses the elements in a list. |
<T> |
public static Iterator<T> |
reverse(Iterator<T> self) Reverses the iterator. |
<T> |
public static T[] |
reverse(T[] self) |
<T> |
public static T[] |
reverse(T[] self, boolean mutate) |
<K, V> |
public static Map<K, V> |
reverseEach(Map<K, V> self, Closure<?> closure) Allows a Map to be iterated through in reverse order using a closure. |
<T> |
public static List<T> |
reverseEach(List<T> self, Closure closure) Iterate over each element of the list in the reverse order. |
<T> |
public static NavigableSet<T> |
reverseEach(NavigableSet<T> self, Closure closure) Iterate over each element of the set in reverse order. |
<T> |
public static T[] |
reverseEach(T[] self, Closure closure) |
|
public static Number |
rightShift(Number self, Number operand) Implementation of the right shift operator for integral types. |
|
public static BitSet |
rightShift(BitSet self, Number operand) Implementation of the right shift operator for BitSets, returning a new BitSet and leaving the original unchanged. |
|
public static Number |
rightShiftUnsigned(Number self, Number operand) Implementation of the right shift (unsigned) operator for integral types. |
|
public static BitSet |
rightShiftUnsigned(BitSet self, Number operand) Implementation of the right shift (unsigned) operator for BitSets, returning a new BitSet and leaving the original unchanged. |
|
public static int |
round(Float number) Round the value |
|
public static float |
round(Float number, int precision) Round the value |
|
public static long |
round(Double number) Round the value |
|
public static double |
round(Double number, int precision) Round the value |
|
public static BigDecimal |
round(BigDecimal number) Round the value |
|
public static BigDecimal |
round(BigDecimal number, int precision) Round the value |
|
public void |
run() |
|
public static TimerTask |
runAfter(Timer timer, int delay, Closure closure) Allows a simple syntax for using timers. |
|
public static void |
setMetaClass(Class self, MetaClass metaClass) Sets the metaclass for a given class. |
|
public static void |
setMetaClass(Object self, MetaClass metaClass) Sets the metaclass for an object. |
|
public static void |
setMetaClass(GroovyObject self, MetaClass metaClass) Sets the metaclass for a GroovyObject . |
|
public static void |
shuffle(List<?> self) Randomly reorders the elements of the specified list. |
|
public static void |
shuffle(List<?> self, Random rnd) Randomly reorders the elements of the specified list using the specified random instance as the source of randomness. |
<T> |
public static void |
shuffle(T[] self) |
<T> |
public static void |
shuffle(T[] self, Random rnd) |
<T> |
public static List<T> |
shuffled(List<T> self) Creates a new list containing the elements of the specified list but in a random order. |
<T> |
public static List<T> |
shuffled(List<T> self, Random rnd) Creates a new list containing the elements of the specified list but in a random order using the specified random instance as the source of randomness. |
<T> |
public static T[] |
shuffled(T[] self) |
<T> |
public static T[] |
shuffled(T[] self, Random rnd) |
|
public static int |
size(Iterator self) Provide the standard Groovy size() method for Iterator .
|
|
public static int |
size(Iterable self) Provide the standard Groovy size() method for Iterable .
|
|
public static int |
size(boolean[] self) |
|
public static int |
size(byte[] self) |
|
public static int |
size(char[] self) |
|
public static int |
size(short[] self) |
|
public static int |
size(int[] self) |
|
public static int |
size(long[] self) |
|
public static int |
size(float[] self) |
|
public static int |
size(double[] self) |
|
public static int |
size(Object[] self) |
<T> |
public static List<T> |
sort(Iterable<T> self) Sorts the Collection. |
<T> |
public static List<T> |
sort(Iterable<T> self, boolean mutate) Sorts the Iterable. |
<K, V> |
public static Map<K, V> |
sort(Map<K, V> self, Closure closure) Sorts the elements from the given map into a new ordered map using the closure as a comparator to determine the ordering. |
<K, V> |
public static Map<K, V> |
sort(Map<K, V> self, Comparator<? super K> comparator) Sorts the elements from the given map into a new ordered Map using the specified key comparator to determine the ordering. |
<K, V> |
public static Map<K, V> |
sort(Map<K, V> self) Sorts the elements from the given map into a new ordered Map using the natural ordering of the keys to determine the ordering. |
<T> |
public static Iterator<T> |
sort(Iterator<T> self) Sorts the given iterator items into a sorted iterator. |
<T> |
public static Iterator<T> |
sort(Iterator<T> self, Comparator<? super T> comparator) Sorts the given iterator items into a sorted iterator using the comparator. |
<T> |
public static List<T> |
sort(Iterable<T> self, boolean mutate, Comparator<? super T> comparator) Sorts the Iterable using the given Comparator. |
<T> |
public static Iterator<T> |
sort(Iterator<T> self, Closure closure) Sorts the given iterator items into a sorted iterator using the Closure to determine the correct ordering. |
<T> |
public static List<T> |
sort(Iterable<T> self, Closure closure) Sorts this Iterable using the given Closure to determine the correct ordering. |
<T> |
public static List<T> |
sort(Iterable<T> self, boolean mutate, Closure closure) Sorts this Iterable using the given Closure to determine the correct ordering. |
<T> |
public static SortedSet<T> |
sort(SortedSet<T> self) Avoids doing unnecessary work when sorting an already sorted set (i.e. an identity function for an already sorted set). |
<K, V> |
public static SortedMap<K, V> |
sort(SortedMap<K, V> self) Avoids doing unnecessary work when sorting an already sorted map (i.e. an identity function for an already sorted map). |
<T> |
public static T[] |
sort(T[] self) |
<T> |
public static T[] |
sort(T[] self, boolean mutate) |
<T> |
public static T[] |
sort(T[] self, Comparator<? super T> comparator) |
<T> |
public static T[] |
sort(T[] self, boolean mutate, Comparator<? super T> comparator) |
<T> |
public static T[] |
sort(T[] self, Closure closure) |
<T> |
public static T[] |
sort(T[] self, boolean mutate, Closure closure) |
|
public static Collection |
split(Object self, Closure closure) Splits all items into two lists based on the closure condition. |
<T> |
public static Collection<Collection<T>> |
split(Collection<T> self, Closure closure) Splits all items into two collections based on the closure condition. |
<T> |
public static List<List<T>> |
split(List<T> self, Closure closure) Splits all items into two collections based on the closure condition. |
<T> |
public static List<Set<T>> |
split(Set<T> self, Closure closure) Splits all items into two collections based on the closure condition. |
<T> |
public static Collection<Collection<T>> |
split(T[] self, Closure closure) |
|
public static SpreadMap |
spread(Map self) Synonym for toSpreadMap(java.util.Map). |
|
public static String |
sprintf(Object self, String format, Object[] values) Sprintf to a string. |
|
public static String |
sprintf(Object self, String format, Object arg) Returns a formatted string using the specified format string and arguments. |
|
public static void |
step(Number self, Number to, Number stepNumber, Closure closure) Iterates from this number up to the given number using a step increment. |
<K, V> |
public static Map<K, V> |
subMap(Map<K, V> map, Collection<K> keys) Creates a sub-Map containing the given keys. |
<K, V> |
public static Map<K, V> |
subMap(Map<K, V> map, K[] keys) Creates a sub-Map containing the given keys. |
<T> |
public static Set<List<T>> |
subsequences(List<T> self) Finds all non-null subsequences of a list. |
|
public static Object |
sum(Iterable<?> self) Sums the items in an Iterable. |
|
public static Object |
sum(Iterator<Object> self) Sums the items from an Iterator. |
|
public static Object |
sum(Iterable<?> self, Object initialValue) Sums the items in an Iterable, adding the result to some initial value. |
|
public static Object |
sum(Iterator<?> self, Object initialValue) Sums the items from an Iterator, adding the result to some initial value. |
<T> |
public static Object |
sum(Iterable<T> self, Closure closure) Sums the result of applying a closure to each item of an Iterable. |
<T> |
public static Object |
sum(Iterator<T> self, Closure closure) Sums the result of applying a closure to each item returned from an iterator. |
<T> |
public static Object |
sum(Iterable<T> self, Object initialValue, Closure closure) Sums the result of applying a closure to each item of an Iterable to some initial value. |
<T> |
public static Object |
sum(Iterator<T> self, Object initialValue, Closure closure) Sums the result of applying a closure to each item of an Iterator to some initial value. |
|
public static byte |
sum(byte[] self) |
|
public static char |
sum(char[] self) |
|
public static short |
sum(short[] self) |
|
public static int |
sum(int[] self) |
|
public static long |
sum(long[] self) |
|
public static float |
sum(float[] self) |
|
public static double |
sum(double[] self) |
|
public static Object |
sum(Object[] self) |
|
public static byte |
sum(byte[] self, byte initialValue) |
|
public static float |
sum(float[] self, float initialValue) |
|
public static short |
sum(short[] self, short initialValue) |
|
public static int |
sum(int[] self, int initialValue) |
|
public static long |
sum(long[] self, long initialValue) |
|
public static char |
sum(char[] self, char initialValue) |
|
public static double |
sum(double[] self, double initialValue) |
|
public static Object |
sum(Object[] self, Object initialValue) |
<T> |
public static Object |
sum(T[] self, Closure closure) |
<T> |
public static Object |
sum(T[] self, Object initialValue, Closure closure) |
<T> |
public static List<T> |
swap(List<T> self, int i, int j) Swaps two elements at the specified positions. |
|
public static boolean[] |
swap(boolean[] self, int i, int j) |
|
public static byte[] |
swap(byte[] self, int i, int j) |
|
public static char[] |
swap(char[] self, int i, int j) |
|
public static short[] |
swap(short[] self, int i, int j) |
|
public static int[] |
swap(int[] self, int i, int j) |
|
public static long[] |
swap(long[] self, int i, int j) |
|
public static float[] |
swap(float[] self, int i, int j) |
|
public static double[] |
swap(double[] self, int i, int j) |
<T> |
public static T[] |
swap(T[] self, int i, int j) |
<T> |
public static List<T> |
tail(List<T> self) Returns the items from the List excluding the first item. |
<T> |
public static SortedSet<T> |
tail(SortedSet<T> self) Returns the items from the SortedSet excluding the first item. |
<T> |
public static Collection<T> |
tail(Iterable<T> self) Returns the items from the Iterable excluding the first item. |
<T> |
public static Iterator<T> |
tail(Iterator<T> self) Returns the original iterator after throwing away the first element. |
<T> |
public static T[] |
tail(T[] self) |
<T> |
public static List<List<T>> |
tails(Iterable<T> self) Calculates the tail values of this Iterable: the first value will be this list of all items from the iterable and the final one will be an empty list, with the intervening values the results of successive applications of tail on the items. |
<T> |
public static List<T> |
take(List<T> self, int num) Returns the first num elements from the head of this List.
|
<T> |
public static SortedSet<T> |
take(SortedSet<T> self, int num) Returns the first num elements from the head of this SortedSet.
|
<T> |
public static Collection<T> |
take(Iterable<T> self, int num) Returns the first num elements from the head of this Iterable.
|
<K, V> |
public static Map<K, V> |
take(Map<K, V> self, int num) Returns a new map containing the first num elements from the head of this map.
|
<T> |
public static Iterator<T> |
take(Iterator<T> self, int num) Returns an iterator of up to the first num elements from this iterator.
|
<T> |
public static T[] |
take(T[] self, int num) |
<T> |
public static Collection<T> |
takeRight(Iterable<T> self, int num) Returns the last num elements from the tail of this Iterable.
|
<T> |
public static List<T> |
takeRight(List<T> self, int num) Returns the last num elements from the tail of this List.
|
<T> |
public static SortedSet<T> |
takeRight(SortedSet<T> self, int num) Returns the last num elements from the tail of this SortedSet.
|
<T> |
public static T[] |
takeRight(T[] self, int num) |
<T> |
public static List<T> |
takeWhile(List<T> self, Closure condition) Returns the longest prefix of this list where each element passed to the given closure condition evaluates to true. |
<T> |
public static Collection<T> |
takeWhile(Iterable<T> self, Closure condition) Returns a Collection containing the longest prefix of the elements from this Iterable where each element passed to the given closure evaluates to true. |
<T> |
public static SortedSet<T> |
takeWhile(SortedSet<T> self, Closure condition) Returns the longest prefix of this SortedSet where each element passed to the given closure condition evaluates to true. |
<K, V> |
public static Map<K, V> |
takeWhile(Map<K, V> self, Closure condition) Returns the longest prefix of this Map where each entry (or key/value pair) when passed to the given closure evaluates to true. |
<T> |
public static Iterator<T> |
takeWhile(Iterator<T> self, Closure condition) Returns the longest prefix of elements in this iterator where each element passed to the given condition closure evaluates to true. |
<T> |
public static T[] |
takeWhile(T[] self, Closure condition) |
<T, U> |
public static U |
tap(U self, Closure<T> closure) Allows the closure to be called for the object reference self (similar to with ) and always returns self. |
|
public static void |
times(Number self, Closure closure) Executes the closure this many times, starting from zero. |
|
public static String |
toArrayString(Object[] self) |
|
public static BigDecimal |
toBigDecimal(Number self) Transforms a Number into a BigDecimal. |
|
public static BigInteger |
toBigInteger(Number self) Transforms this Number into a BigInteger. |
|
public static Boolean |
toBoolean(Boolean self) Identity conversion which returns Boolean.TRUE for a true Boolean and Boolean.FALSE for a false Boolean. |
|
public static Double |
toDouble(Number self) Transforms a Number into a Double. |
|
public static Float |
toFloat(Number self) Transforms a Number into a Float. |
|
public static Integer |
toInteger(Number self) Transforms a Number into an Integer. |
<T> |
public static List<T> |
toList(Iterator<T> self) Convert an iterator to a List. |
<T> |
public static List<T> |
toList(Iterable<T> self) Convert an Iterable to a List. |
<T> |
public static List<T> |
toList(Enumeration<T> self) Convert an enumeration to a List. |
|
public static List<Boolean> |
toList(boolean[] self) |
|
public static List<Byte> |
toList(byte[] self) |
|
public static List<Character> |
toList(char[] self) |
|
public static List<Short> |
toList(short[] self) |
|
public static List<Integer> |
toList(int[] self) |
|
public static List<Long> |
toList(long[] self) |
|
public static List<Float> |
toList(float[] self) |
|
public static List<Double> |
toList(double[] self) |
<T> |
public static List<T> |
toList(T[] self) |
|
public static String |
toListString(Collection self) Returns the string representation of the given list. |
|
public static String |
toListString(Collection self, int maxSize) Returns the string representation of the given list. |
|
public static Long |
toLong(Number self) Transforms a Number into a Long. |
|
public static char |
toLowerCase(Character self) Converts the character to lowercase. |
|
public static String |
toMapString(Map self) Returns the string representation of this map. |
|
public static String |
toMapString(Map self, int maxSize) Returns the string representation of this map. |
<T> |
public static Set<T> |
toSet(Collection<T> self) Convert a Collection to a Set. |
<T> |
public static Set<T> |
toSet(Iterable<T> self) Convert an Iterable to a Set. |
<T> |
public static Set<T> |
toSet(Iterator<T> self) Convert an iterator to a Set. |
<T> |
public static Set<T> |
toSet(Enumeration<T> self) Convert an enumeration to a Set. |
|
public static Set<Boolean> |
toSet(boolean[] self) |
|
public static Set<Byte> |
toSet(byte[] self) |
|
public static Set<Character> |
toSet(char[] self) |
|
public static Set<Short> |
toSet(short[] self) |
|
public static Set<Integer> |
toSet(int[] self) |
|
public static Set<Long> |
toSet(long[] self) |
|
public static Set<Float> |
toSet(float[] self) |
|
public static Set<Double> |
toSet(double[] self) |
<T> |
public static List<T> |
toSorted(Iterable<T> self) Sorts the Iterable. |
<T> |
public static List<T> |
toSorted(Iterable<T> self, Comparator<? super T> comparator) Sorts the Iterable using the given Comparator. |
<T> |
public static List<T> |
toSorted(Iterable<T> self, Closure closure) Sorts this Iterable using the given Closure to determine the correct ordering. |
<T> |
public static Iterator<T> |
toSorted(Iterator<T> self) Sorts the Iterator. |
<T> |
public static Iterator<T> |
toSorted(Iterator<T> self, Comparator<? super T> comparator) Sorts the given iterator items using the comparator. |
<T> |
public static Iterator<T> |
toSorted(Iterator<T> self, Closure closure) Sorts the given iterator items into a sorted iterator using the Closure to determine the correct ordering. |
<K, V> |
public static Map<K, V> |
toSorted(Map<K, V> self) Sorts the elements from the given map into a new ordered map using a NumberAwareComparator on map entry values to determine the resulting order. |
<K, V> |
public static Map<K, V> |
toSorted(Map<K, V> self, Comparator<Map.Entry<K, V>> comparator) Sorts the elements from the given map into a new ordered map using the supplied comparator to determine the ordering. |
<K, V> |
public static Map<K, V> |
toSorted(Map<K, V> self, Closure condition) Sorts the elements from the given map into a new ordered map using the supplied Closure condition as a comparator to determine the ordering. |
<T> |
public static Set<T> |
toSorted(SortedSet<T> self) Avoids doing unnecessary work when sorting an already sorted set |
<K, V> |
public static Map<K, V> |
toSorted(SortedMap<K, V> self) Avoids doing unnecessary work when sorting an already sorted map |
<T> |
public static T[] |
toSorted(T[] self) |
<T> |
public static T[] |
toSorted(T[] self, Comparator<? super T> comparator) |
<T> |
public static T[] |
toSorted(T[] self, Closure closure) |
|
public static SpreadMap |
toSpreadMap(Map self) Returns a new SpreadMap from this map. |
|
public static SpreadMap |
toSpreadMap(List self) Creates a spreadable map from this list. |
|
public static SpreadMap |
toSpreadMap(Iterable self) Creates a spreadable map from this iterable. |
|
public static SpreadMap |
toSpreadMap(Object[] self) |
|
public static String |
toString(AbstractMap self) Returns the string representation of the given map. |
|
public static String |
toString(AbstractCollection self) Returns the string representation of the given collection. |
|
public static String |
toString(Object value) Create a String representation of this object. |
|
public static String |
toString(boolean[] self) |
|
public static String |
toString(byte[] self) |
|
public static String |
toString(char[] self) |
|
public static String |
toString(short[] self) |
|
public static String |
toString(int[] self) |
|
public static String |
toString(long[] self) |
|
public static String |
toString(float[] self) |
|
public static String |
toString(double[] self) |
|
public static String |
toString(Object[] self) |
<T> |
public static Iterator<T> |
toUnique(Iterator<T> self, Closure condition) Returns an iterator equivalent to this iterator but with all duplicated items removed where duplicate (equal) items are deduced by calling the supplied Closure condition. |
<T> |
public static Iterator<T> |
toUnique(Iterator<T> self, Comparator<? super T> comparator) Returns an iterator equivalent to this iterator with all duplicated items removed by using the supplied comparator. |
<T> |
public static Iterator<T> |
toUnique(Iterator<T> self) Returns an iterator equivalent to this iterator with all duplicated items removed by using the natural ordering of the items. |
<T> |
public static Collection<T> |
toUnique(Iterable<T> self, Comparator<? super T> comparator) Returns a Collection containing the items from the Iterable but with duplicates removed. |
<T> |
public static List<T> |
toUnique(List<T> self, Comparator<? super T> comparator) Returns a List containing the items from the List but with duplicates removed. |
<T> |
public static Collection<T> |
toUnique(Iterable<T> self) Returns a Collection containing the items from the Iterable but with duplicates removed using the natural ordering of the items to determine uniqueness. |
<T> |
public static List<T> |
toUnique(List<T> self) Returns a List containing the items from the List but with duplicates removed using the natural ordering of the items to determine uniqueness. |
<T> |
public static Collection<T> |
toUnique(Iterable<T> self, Closure condition) Returns a Collection containing the items from the Iterable but with duplicates removed. |
<T> |
public static List<T> |
toUnique(List<T> self, Closure condition) Returns a List containing the items from the List but with duplicates removed. |
<T> |
public static T[] |
toUnique(T[] self) |
<T> |
public static T[] |
toUnique(T[] self, Comparator<? super T> comparator) |
<T> |
public static T[] |
toUnique(T[] self, Closure closure) |
|
public static char |
toUpperCase(Character self) Converts the character to uppercase. |
|
public static List |
transpose(List self) Adds GroovyCollections#transpose(List) as a method on lists. |
|
public static int |
transpose(int self) |
|
public static long |
transpose(long self) |
|
public static double |
transpose(double self) |
|
public static float |
trunc(Float number, int precision) Truncate the value |
|
public static float |
trunc(Float number) Truncate the value |
|
public static double |
trunc(Double number) Truncate the value |
|
public static double |
trunc(Double number, int precision) Truncate the value |
|
public static BigDecimal |
trunc(BigDecimal number) Truncate the value |
|
public static BigDecimal |
trunc(BigDecimal number, int precision) Truncate the value |
|
public static Number |
unaryMinus(Number left) Negates the number. |
|
public static Number |
unaryPlus(Number left) Returns the number, effectively being a noop for numbers. |
<T> |
public static Collection<T> |
union(Collection<T> left, Collection<T> right) Create a Collection composed of the union of both collections. |
<T> |
public static Collection<T> |
union(Collection<T> left, Collection<T> right, Comparator<? super T> comparator) Create a Collection composed of the union of both collections. |
<T> |
public static Collection<T> |
union(Iterable<T> left, Iterable<T> right) Create a Collection composed of the union of both iterables. |
<T> |
public static Collection<T> |
union(Iterable<T> left, Iterable<T> right, Comparator<? super T> comparator) Create a Collection composed of the union of both iterables. |
<T> |
public static Collection<T> |
union(Iterable<T> left, Iterable<T> right, Closure condition) Create a Collection composed of the union of both iterables. |
<T> |
public static List<T> |
union(List<T> left, Iterable<T> right) Create a List composed of the union of a List and an Iterable. |
<T> |
public static List<T> |
union(List<T> left, Iterable<T> right, Comparator<? super T> comparator) Create a List composed of the union of a List and an Iterable. |
<T> |
public static Set<T> |
union(Set<T> left, Iterable<T> right) Create a Set composed of the union of a Set and an Iterable. |
<T> |
public static Set<T> |
union(Set<T> left, Iterable<T> right, Comparator<? super T> comparator) Create a Set composed of the union of a Set and an Iterable. |
<T> |
public static SortedSet<T> |
union(SortedSet<T> left, Iterable<T> right) Create a SortedSet composed of the union of a SortedSet and an Iterable. |
<T> |
public static SortedSet<T> |
union(SortedSet<T> left, Iterable<T> right, Comparator<? super T> comparator) Create a SortedSet composed of the intersection of a SortedSet and an Iterable. |
|
public static Object[] |
union(Object[] left, Collection<?> right) |
|
public static Object[] |
union(Object[] left, Iterable<?> right) |
|
public static Object[] |
union(Object[] left, Object[] right) |
|
public static Object[] |
union(Object[] left, Object right) |
<T> |
public static Iterator<T> |
unique(Iterator<T> self) Returns an iterator equivalent to this iterator with all duplicated items removed by using Groovy's default number-aware comparator. |
<T> |
public static Collection<T> |
unique(Collection<T> self) Modifies this collection to remove all duplicated items, using Groovy's default number-aware comparator. |
<T> |
public static List<T> |
unique(List<T> self) Modifies this List to remove all duplicated items, using Groovy's default number-aware comparator. |
<T> |
public static Collection<T> |
unique(Collection<T> self, boolean mutate) Remove all duplicates from a given Collection using Groovy's default number-aware comparator. |
<T> |
public static List<T> |
unique(List<T> self, boolean mutate) Remove all duplicates from a given List using Groovy's default number-aware comparator. |
<T> |
public static Iterator<T> |
unique(Iterator<T> self, Closure condition) Returns an iterator equivalent to this iterator but with all duplicated items removed by using a Closure to determine duplicate (equal) items. |
<T> |
public static Collection<T> |
unique(Collection<T> self, Closure closure) A convenience method for making a collection unique using a Closure to determine duplicate (equal) items. |
<T> |
public static List<T> |
unique(List<T> self, Closure closure) A convenience method for making a List unique using a Closure to determine duplicate (equal) items. |
<T> |
public static Collection<T> |
unique(Collection<T> self, boolean mutate, Closure closure) A convenience method for making a collection unique using a Closure to determine duplicate (equal) items. |
<T> |
public static List<T> |
unique(List<T> self, boolean mutate, Closure closure) A convenience method for making a List unique using a Closure to determine duplicate (equal) items. |
<T> |
public static Iterator<T> |
unique(Iterator<T> self, Comparator<? super T> comparator) Returns an iterator equivalent to this iterator with all duplicated items removed by using the supplied comparator. |
<T> |
public static Collection<T> |
unique(Collection<T> self, Comparator<? super T> comparator) Remove all duplicates from a given Collection. |
<T> |
public static List<T> |
unique(List<T> self, Comparator<? super T> comparator) Remove all duplicates from a given List. |
<T> |
public static Collection<T> |
unique(Collection<T> self, boolean mutate, Comparator<? super T> comparator) Remove all duplicates from a given Collection. |
<T> |
public static List<T> |
unique(List<T> self, boolean mutate, Comparator<? super T> comparator) Remove all duplicates from a given List. |
|
public static void |
upto(Number self, Number to, Closure closure) Iterates from this number up to the given number, inclusive, incrementing by one each time. |
|
public static void |
upto(long self, Number to, Closure closure) Iterates from this number up to the given number, inclusive, incrementing by one each time. |
|
public static void |
upto(Long self, Number to, Closure closure) Iterates from this number up to the given number, inclusive, incrementing by one each time. |
|
public static void |
upto(float self, Number to, Closure closure) Iterates from this number up to the given number, inclusive, incrementing by one each time. |
|
public static void |
upto(Float self, Number to, Closure closure) Iterates from this number up to the given number, inclusive, incrementing by one each time. |
|
public static void |
upto(double self, Number to, Closure closure) Iterates from this number up to the given number, inclusive, incrementing by one each time. |
|
public static void |
upto(Double self, Number to, Closure closure) Iterates from this number up to the given number, inclusive, incrementing by one each time. |
|
public static void |
upto(BigInteger self, Number to, Closure closure) Iterates from this number up to the given number, inclusive, incrementing by one each time. |
|
public static void |
upto(BigDecimal self, Number to, Closure closure) Iterates from this number up to the given number, inclusive, incrementing by one each time. |
<T> |
public static T |
use(Object self, Class categoryClass, Closure<T> closure) Scoped use method |
<T> |
public static T |
use(Object self, List<Class> categoryClassList, Closure<T> closure) Scoped use method with list of categories. |
|
public static Object |
use(Object self, Object[] array) Allows you to use a list of categories, specifying the list as varargs. |
<T, U> |
public static T |
with(U self, Closure<T> closure) Allows the closure to be called for the object reference self. |
<T, U extends T, V extends T> |
public static T |
with(U self, boolean returnIt, Closure<V> closure) Allows the closure to be called for the object reference self. |
<K, V> |
public static Map<K, V> |
withCollectedKeys(Iterator<V> values, Map<K, V> collector, Function<? super V, K> keyTransform) A variant of withCollectedKeys for Iterators. |
<K, V> |
public static Map<K, V> |
withCollectedKeys(Iterator<V> values, Function<? super V, K> keyTransform) A variant of withCollectedKeys for Iterators. |
<K, V> |
public static Map<K, V> |
withCollectedKeys(Iterable<V> values, Map<K, V> collector, Function<? super V, K> keyTransform) Transform Iterable elements into Map entries with values unchanged and keys transformed using the supplied function. |
<K, V> |
public static Map<K, V> |
withCollectedKeys(Iterable<V> values, Function<? super V, K> keyTransform) Transform Iterable elements into Map entries with values unchanged and keys transformed using the supplied function. |
<K, V> |
public static Map<K, V> |
withCollectedValues(Iterator<K> keys, Map<K, V> collector, Function<? super K, V> valueTransform) A variant of withCollectedValues for Iterators. |
<K, V> |
public static Map<K, V> |
withCollectedValues(Iterator<K> keys, Function<? super K, V> valueTransform) A variant of withCollectedValues for Iterators. |
<K, V> |
public static Map<K, V> |
withCollectedValues(Iterable<K> keys, Map<K, V> collector, Function<? super K, V> valueTransform) Transform Iterable elements into Map entries with keys unchanged and values transformed using the supplied function. |
<K, V> |
public static Map<K, V> |
withCollectedValues(Iterable<K> keys, Function<? super K, V> valueTransform) Transform Iterable elements into Map entries with keys unchanged and values transformed using the supplied function. |
<K, V> |
public static Map<K, V> |
withDefault(Map<K, V> self, Closure<V> init) Wraps a map using the decorator pattern with a wrapper that intercepts all calls to get(key) . |
<K, V> |
public static Map<K, V> |
withDefault(Map<K, V> self, boolean autoGrow, boolean autoShrink, Closure<V> init) Wraps a map using the decorator pattern with a wrapper that intercepts all calls to get(key) and put(key, value) .
|
<T> |
public static ListWithDefault<T> |
withDefault(List<T> self, Closure<T> init) An alias for withLazyDefault which decorates a list allowing
it to grow when called with index values outside the normal list bounds. |
<T> |
public static List<T> |
withDefault$$bridge(List<T> self, Closure<T> init) |
<T> |
public static ListWithDefault<T> |
withEagerDefault(List<T> self, Closure<T> init) Decorates a list allowing it to grow when called with a non-existent index value. |
<T> |
public static List<T> |
withEagerDefault$$bridge(List<T> self, Closure<T> init) |
<E> |
public static List<Tuple2<E, Integer>> |
withIndex(Iterable<E> self) Zips an Iterable with indices in (value, index) order. |
<E> |
public static List<Tuple2<E, Integer>> |
withIndex(Iterable<E> self, int offset) Zips an Iterable with indices in (value, index) order. |
<E> |
public static Iterator<Tuple2<E, Integer>> |
withIndex(Iterator<E> self) Zips an iterator with indices in (value, index) order. |
<E> |
public static Iterator<Tuple2<E, Integer>> |
withIndex(Iterator<E> self, int offset) Zips an iterator with indices in (value, index) order. |
<T> |
public static ListWithDefault<T> |
withLazyDefault(List<T> self, Closure<T> init) Decorates a list allowing it to grow when called with a non-existent index value. |
<T> |
public static List<T> |
withLazyDefault$$bridge(List<T> self, Closure<T> init) |
|
public static Object |
withMethodClosure(Object self, MethodClosure mc) A utility method for calling a method closure on an object. |
|
public static Object |
withTraits(Object self, Class<?> traits) Dynamically wraps an instance into something which implements the supplied trait classes. |
|
public static Number |
xor(Number left, Number right) Bitwise XOR together two Numbers. |
|
public static BitSet |
xor(BitSet left, BitSet right) Bitwise XOR together two BitSets. |
|
public static Boolean |
xor(Boolean left, Boolean right) Exclusive disjunction of two boolean operators |
<T> |
public static Set<T> |
xor(Set<T> left, Iterable<T> right) Create a Set composed of the symmetric difference of a Set and an Iterable. |
<T> |
public static Set<T> |
xor(Set<T> left, Iterable<T> right, Comparator<? super T> comparator) Create a Set composed of the symmetric difference of a Set and an Iterable. |
<T> |
public static SortedSet<T> |
xor(SortedSet<T> left, Iterable<T> right) Create a SortedSet composed of the symmetric difference of a SortedSet and an Iterable. |
<T> |
public static SortedSet<T> |
xor(SortedSet<T> left, Iterable<T> right, Comparator<? super T> comparator) Create a SortedSet composed of the symmetric difference of a SortedSet and an Iterable. |
<U, V> |
public static Iterator<Tuple2<U, V>> |
zip(Iterable<U> self, Iterable<V> other) An iterator of all the pairs of two Iterables. |
<U, V> |
public static Iterator<Tuple2<U, V>> |
zip(Iterator<U> self, Iterator<V> other) An iterator of all the pairs of two Iterators. |
Gets the absolute value.
Note: This method is NOT called if number is a BigInteger or BigDecimal, because those classes implement a method with a better exact match.
number
- a NumberGets the absolute value.
number
- a LongGets the absolute value.
number
- a FloatGets the absolute value.
number
- a DoubleAdds all items from the iterator to the Collection.
self
- the collectionitems
- the items to addAdds all items from the iterable to the Collection.
self
- the collectionitems
- the items to addModifies the collection by adding all the elements in the specified array to the collection. The behavior of this operation is undefined if the specified array is modified while the operation is in progress.
See also plus
or the '+' operator if wanting to produce a new collection
containing additional items but while leaving the original collection unchanged.
self
- a Collection to be modifieditems
- array containing elements to be added to this collection Modifies this list by inserting all the elements in the specified array into the
list at the specified position. Shifts the
element currently at that position (if any) and any subsequent
elements to the right (increases their indices). The new elements
will appear in this list in the order that they occur in the array.
The behavior of this operation is undefined if the specified array
is modified while the operation is in progress.
See also plus
for similar functionality with copy semantics, i.e. which produces a new
list after adding the additional items at the specified position but leaves the original list unchanged.
self
- a list to be modifieditems
- array containing elements to be added to this collectionindex
- index at which to insert the first element from the
specified arrayAllows the usage of addShutdownHook without getting the runtime first.
self
- the object the method is called on (ignored)closure
- the shutdown hook actionBitwise AND together two Numbers.
left
- a Numberright
- another Number to bitwise ANDBitwise AND together two BitSets.
left
- a BitSetright
- another BitSet to bitwise ANDLogical conjunction of two boolean operators.
left
- left operatorright
- right operatorCreates a Set composed of the intersection of a Set and an Iterable. Any elements that exist in both are added to the resultant Set.
This operation will always create a new object for the result, while the operands remain unchanged.
def a = [1,2,3,4] as Set def b = [3,4,5,6] as Set assert (a & b) == [3,4] as SetBy default, Groovy uses a NumberAwareComparator when determining if an element exists in both sets.
left
- a Setright
- an IterableCreates a Set composed of the intersection of a Set and an Iterable. Any elements that exist in both iterables are added to the resultant collection.
This operation will always create a new object for the result, while the operands remain unchanged.
assert [3,4] as Set == ([1,2,3,4] as Set).and([3,4,5,6], Comparator.naturalOrder())
left
- a Setright
- an Iterablecomparator
- a ComparatorCreates a SortedSet composed of the intersection of a SortedSet and an Iterable. Any elements that exist in both are added to the resultant SortedSet.
This operation will always create a new object for the result, while the operands remain unchanged.
def a = [1,2,3,4] as SortedSet def b = [3,4,5,6] as Set assert (a & b) == [3,4] as SortedSetBy default, Groovy uses a NumberAwareComparator when determining if an element exists in both sets.
left
- a SortedSetright
- an IterableCreates a SortedSet composed of the intersection of a SortedSet and an Iterable. Any elements that exist in both iterables are added to the resultant collection.
This operation will always create a new object for the result, while the operands remain unchanged.
assert [3,4] as SortedSet == ([1,2,3,4] as SortedSet).and([3,4,5,6], Comparator.naturalOrder())
left
- a SortedSetright
- an Iterablecomparator
- a Comparator Iterates over the elements of a collection, and checks whether at least
one element is true according to the Groovy Truth.
Equivalent to self.any({element ->
element})
assert [false, true].any() assert [0, 1].any() assert ![0, 0].any()
self
- the object over which we iterateIterates over the contents of an object or collection, and checks whether a predicate is valid for at least one element.
assert [1, 2, 3].any { it == 2 }
assert ![1, 2, 3].any { it >
3 }
self
- the object over which we iteratepredicate
- the closure predicate used for matchingIterates over the contents of an iterator, and checks whether a predicate is valid for at least one element.
assert [1, 2, 3].iterator().any { it == 2 }
assert ![1, 2, 3].iterator().any { it >
3 }
self
- the iterator over which we iteratepredicate
- the closure predicate used for matchingIterates over the contents of an iterable, and checks whether a predicate is valid for at least one element.
assert [1, 2, 3].any { it == 2 }
assert ![1, 2, 3].any { it >
3 }
self
- the iterable over which we iteratepredicate
- the closure predicate used for matchingIterates over the entries of a map, and checks whether a predicate is valid for at least one entry. If the closure takes one parameter then it will be passed the Map.Entry otherwise if the closure takes two parameters then it will be passed the key and the value.
assert [2:3, 4:5, 5:10].any { key, value->
key * 2 == value } assert ![2:3, 4:5, 5:10].any { entry->
entry.key == entry.value * 2 }
self
- the map over which we iteratepredicate
- the 1 or 2 arg closure predicate used for matchingCoerce an object instance to a boolean value. An object is coerced to true if it's not null, to false if it is null.
object
- the object to coerceCoerce a Boolean instance to a boolean value.
// you can omit ".asBoolean()" assert Boolean.TRUE.asBoolean() assert !Boolean.FALSE.asBoolean()
Coerce an AtomicBoolean instance to a boolean value.
import java.util.concurrent.atomic.AtomicBoolean // you can omit ".asBoolean()" assert new AtomicBoolean(true).asBoolean() assert !new AtomicBoolean(false).asBoolean() assert !new AtomicBoolean(true).tap{set(false)}
Coerce a collection instance to a boolean value. A collection is coerced to false if it's empty, and to true otherwise.
assert [1,2].asBoolean() == true
assert [].asBoolean() == false
collection
- the collectionCoerce a map instance to a boolean value. A map is coerced to false if it's empty, and to true otherwise.
assert [:] as Boolean == false assert [a:2] as Boolean == true
map
- the mapCoerce an iterator instance to a boolean value. An iterator is coerced to false if there are no more elements to iterate over, and to true otherwise.
iterator
- the iteratorCoerce an enumeration instance to a boolean value. An enumeration is coerced to false if there are no more elements to enumerate, and to true otherwise.
enumeration
- the enumerationCoerce a character to a boolean value. A character is coerced to false if it's character value is equal to 0, and to true otherwise.
character
- the characterCoerce a Float instance to a boolean value.
object
- the Floattrue
for non-zero and non-NaN values, else false
Coerce a Double instance to a boolean value.
object
- the Doubletrue
for non-zero and non-NaN values, else false
Coerce a number to a boolean value. A number is coerced to false if its double value is equal to 0, and to true otherwise.
number
- the numberCreates a checked view of a List.
Creates a checked view of a Queue.
Creates a checked view of a Collection.
Creates a checked view of a Set.
Creates a checked view of a SortedSet.
Creates a checked view of a NavigableSet.
Creates a checked view of a Map.
Creates a checked view of a SortedMap.
Creates a checked view of a NavigableMap.
Converts this Iterable to a Collection. Returns the original argument if it is already a Collection.
Example usage:
assert new HashSet().asCollection() instanceof Collection
self
- an Iterable to be converted into a CollectionA convenience method for creating an immutable Map.
self
- a MapA convenience method for creating an immutable SortedMap.
self
- a SortedMapA convenience method for creating an immutable List.
def mutable = [1,2,3] def immutable = mutable.asImmutable() try { immutable << 4 assert false } catch (UnsupportedOperationException) { assert true } mutable << 4 assert mutable.size() == 4 assert immutable.size() == 3
self
- a ListA convenience method for creating an immutable Set.
self
- a SetA convenience method for creating an immutable SortedSet.
self
- a SortedSetA convenience method for creating an immutable Collection.
self
- a CollectionConverts this Iterable to a List. Returns the original Iterable if it is already a List.
Example usage:
assert new HashSet().asList() instanceof List
self
- an Iterable to be converted into a ListCreates a view list with reversed order, and the order of original list will not change.
def list = ["a", 6, true] assert list.asReversed() == [true, 6, "a"] assert list == ["a", 6, true]
self
- a listT
- the type of elementCreates a reverse order view of the set. The order of original list will not change.
TreeSet navSet = [2, 4, 1, 3] // natural order is sorted assert navSet.asReversed() == [4, 3, 2, 1] as Set
self
- a NavigableSetT
- the type of elementGet the detail information of Throwable instance's stack trace
self
- a Throwable instanceCreates a synchronized view of a Map.
self
- a MapCreates a synchronized view of a SortedMap.
self
- a SortedMapCreates a synchronized view of a NavigableMap.
self
- a NavigableMapCreates a synchronized view of a Collection.
self
- a CollectionCreates a synchronized view of a List.
self
- a ListCreates a synchronized view of a Set.
self
- a SetCreates a synchronized view of a SortedSet.
self
- a SortedSetCreates a synchronized view of a NavigableSet.
self
- a NavigableSetConverts the given iterable to another type.
iterable
- an Iterableclazz
- the desired classConverts the given collection to another type. A default concrete type is used for List, Set, or SortedSet. If the given type has a constructor taking a collection, that is used. Otherwise, the call is deferred to asType(Object,Class). If this collection is already of the given type, the same instance is returned.
col
- a collectionclazz
- the desired classCoerces the closure to an implementation of the given class. The class is assumed to be an interface or class with a single method definition. The closure is used as the implementation of that single method.
impl
- the implementation of the single methodtype
- the target typeCoerces this map to the given type, using the map's keys as the public method names, and values as the implementation. Typically the value would be a closure which behaves like the method implementation.
map
- this mapclazz
- the target typeTransform this number to the given type, using the 'as' operator. The following types are supported in addition to the default asType(java.lang.Object, java.lang.Class):
self
- this numbertype
- the desired type of the transformed resultConverts a given object to a type. This method is used through the "as" operator and is overloadable as any other operator.
obj
- the object to converttype
- the goal typeCreates an unmodifiable view of a Map.
self
- a MapCreates an unmodifiable view of a SortedMap.
self
- a SortedMapCreates an unmodifiable view of a NavigableMap.
self
- a NavigableMapCreates an unmodifiable view of a List.
def mutable = [1,2,3] def unmodifiable = mutable.asUnmodifiable() try { unmodifiable << 4 assert false } catch (UnsupportedOperationException) { assert true } mutable << 4 assert unmodifiable.size() == 4
self
- a ListCreates an unmodifiable view of a Set.
self
- a SetCreates an unmodifiable view of a SortedSet.
self
- a SortedSetCreates an unmodifiable view of a NavigableSet.
self
- a NavigableSetCreates an unmodifiable view of a Collection.
self
- a CollectionAverages the items in an Iterable. This is equivalent to invoking the "plus" method on all items in the Iterable and then dividing by the total count using the "div" method for the resulting sum.
assert 3 == [1, 2, 6].average()
self
- Iterable of values to average Averages the items from an Iterator. This is equivalent to invoking the
"plus" method on all items in the array and then dividing by the
total count using the "div" method for the resulting sum.
The iterator will become exhausted of elements after determining the average value.
While most frequently used with aggregates of numbers,
average
will work with any class supporting plus
and div
, e.g.:
class Stars { int numStars = 0 String toString() { '*' * numStars } Stars plus(Stars other) { new Stars(numStars: numStars + other.numStars) } Stars div(Number divisor) { int newSize = numStars.intdiv(divisor) new Stars(numStars: newSize) } } def stars = [new Stars(numStars: 1), new Stars(numStars: 3)] assert stars*.toString() == ['*', '***'] assert stars.average().toString() == '**'
self
- an Iterator for the values to average Averages the result of applying a closure to each item of an Iterable.
iter.average(closure)
is equivalent to:
iter.collect(closure).average()
.
assert 20 == [1, 3].average { it * 10 } assert 3 == ['to', 'from'].average { it.size() }
self
- an Iterableclosure
- a single parameter closure that returns a (typically) numeric value. Averages the result of applying a closure to each item returned from an iterator.
iter.average(closure)
is equivalent to:
iter.collect(closure).average()
.
The iterator will become exhausted of elements after determining the average value.
self
- An Iteratorclosure
- a single parameter closure that returns a (typically) numeric value.Bitwise NEGATE a BitSet.
self
- a BitSetBitwise NEGATE a Number.
left
- a Number Returns a BufferedIterator
that allows examining the next element without
consuming it.
assert [1, 2, 3, 4].iterator().buffered().with { [head(), toList()] } == [1, [1, 2, 3, 4]]
self
- an iterator object Returns a BufferedIterator
that allows examining the next element without
consuming it.
assert new LinkedHashSet([1,2,3,4]).bufferedIterator().with { [head(), toList()] } == [1, [1,2,3,4]]
self
- an iterable object Returns a BufferedIterator
that allows examining the next element without
consuming it.
assert [1, 2, 3, 4].bufferedIterator().with { [head(), toList()] } == [1, [1, 2, 3, 4]]
self
- a listChops the Iterable into pieces, returning lists with sizes corresponding to the supplied chop sizes. If the Iterable isn't large enough, truncated (possibly empty) pieces are returned. Using a chop size of -1 will cause that piece to contain all remaining items from the Iterable.
Example usage:
assert [1, 2, 3, 4].chop(1) == [[1]] assert [1, 2, 3, 4].chop(1,-1) == [[1], [2, 3, 4]] assert ('a'..'h').chop(2, 4) == [['a', 'b'], ['c', 'd', 'e', 'f']] assert ['a', 'b', 'c', 'd', 'e'].chop(3) == [['a', 'b', 'c']] assert ['a', 'b', 'c', 'd', 'e'].chop(1, 2, 3) == [['a'], ['b', 'c'], ['d', 'e']] assert ['a', 'b', 'c', 'd', 'e'].chop(1, 2, 3, 3, 3) == [['a'], ['b', 'c'], ['d', 'e'], [], []]
self
- an Iterable to be choppedchopSizes
- the sizes for the returned piecesChops the iterator items into pieces, returning lists with sizes corresponding to the supplied chop sizes. If the iterator is exhausted early, truncated (possibly empty) pieces are returned. Using a chop size of -1 will cause that piece to contain all remaining items from the iterator.
self
- an Iterator to be choppedchopSizes
- the sizes for the returned pieces Collates this iterable into sub-lists of length size
.
Example:
def list = [ 1, 2, 3, 4, 5, 6, 7 ] def coll = list.collate( 3 ) assert coll == [ [ 1, 2, 3 ], [ 4, 5, 6 ], [ 7 ] ]
self
- an Iterablesize
- the length of each sub-list in the returned list Collates this iterable into sub-lists of length size
stepping through the code step
elements for each subList.
Example:
def list = [ 1, 2, 3, 4 ] def coll = list.collate( 3, 1 ) assert coll == [ [ 1, 2, 3 ], [ 2, 3, 4 ], [ 3, 4 ], [ 4 ] ]
self
- an Iterablesize
- the length of each sub-list in the returned liststep
- the number of elements to step through for each sub-list Collates this iterable into sub-lists of length size
. Any remaining elements in
the iterable after the subdivision will be dropped if keepRemainder
is false.
Example:
def list = [ 1, 2, 3, 4, 5, 6, 7 ] def coll = list.collate( 3, false ) assert coll == [ [ 1, 2, 3 ], [ 4, 5, 6 ] ]
self
- an Iterablesize
- the length of each sub-list in the returned listkeepRemainder
- if true, any remaining elements are returned as sub-lists. Otherwise they are discarded Collates this iterable into sub-lists of length size
stepping through the code step
elements for each sub-list. Any remaining elements in the iterable after the subdivision will be dropped if
keepRemainder
is false.
Example:
def list = [ 1, 2, 3, 4 ] assert list.collate( 2, 2, true ) == [ [ 1, 2 ], [ 3, 4 ] ] assert list.collate( 3, 1, true ) == [ [ 1, 2, 3 ], [ 2, 3, 4 ], [ 3, 4 ], [ 4 ] ] assert list.collate( 3, 1, false ) == [ [ 1, 2, 3 ], [ 2, 3, 4 ] ]
self
- an Iterablesize
- the length of each sub-list in the returned liststep
- the number of elements to step through for each sub-listkeepRemainder
- if true, any remaining elements are returned as sub-lists. Otherwise they are discardedIterates through this aggregate Object transforming each item into a new value using Closure.IDENTITY as a transformer, basically returning a list of items copied from the original object.
def obj = new Object(); assert obj.collect() == [obj]
self
- an aggregate Object with an Iterator returning its items Iterates through this aggregate Object transforming each item into a new value using the
transform
closure, returning a list of transformed values.
def list = [1, 'a', 1.23, true ] def types = list.collect { it.class } assert types == [Integer, String, BigDecimal, Boolean]
self
- an aggregate Object with an Iterator returning its itemstransform
- the closure used to transform each item of the aggregate object Iterates through this aggregate Object transforming each item into a new value using the transform
closure
and adding it to the supplied collector
.
self
- an aggregate Object with an Iterator returning its itemscollector
- the Collection to which the transformed values are addedtransform
- the closure used to transform each item of the aggregate object Iterates through this Iterator transforming each item into a new value using the
transform
closure, returning a list of transformed values.
self
- an Iteratortransform
- the closure used to transform each item Iterates through this Iterator transforming each item into a new value using the transform
closure
and adding it to the supplied collector
.
assert [1,2,3].iterator().collect() == [1,2,3]
self
- an Iteratorcollector
- the Collection to which the transformed values are addedtransform
- the closure used to transform each itemIterates through this collection transforming each entry into a new value using Closure.IDENTITY as a transformer, basically returning a list of items copied from the original collection.
assert [1,2,3].collect() == [1,2,3]
self
- an Iterable Iterates through this Iterable transforming each entry into a new value using the transform
closure
returning a list of transformed values.
assert [1,2,3].collect { it * 2 } == [2,4,6]
self
- an Iterabletransform
- the closure used to transform each item of the collection Iterates through this collection transforming each value into a new value using the transform
closure
and adding it to the supplied collector
.
assert [2,4,5,6].collect(new HashSet()) { (int)(it / 2) } == [1,2,3] as Set
self
- an Iterablecollector
- the Collection to which the transformed values are addedtransform
- the closure used to transform each item Iterates through this Map transforming each map entry into a new value using the transform
closure
returning the collector
with all transformed values added to it.
assert [a:1, b:2].collect(new HashSet()) { key, value -> key * value } == ["a", "bb"] as Set assert [3:20, 2:30].collect(new HashSet()) { entry -> entry.key * entry.value } == [60] as Set
self
- a Mapcollector
- the Collection to which transformed values are addedtransform
- the transformation closure which can take one (Map.Entry) or two (key, value) parameters Iterates through this Map transforming each map entry into a new value using the transform
closure
returning a list of transformed values.
assert [a:1, b:2].collect { key, value -> key * value } == ["a", "bb"] assert [3:20, 2:30].collect { entry -> entry.key * entry.value } == [60, 60]
self
- a Maptransform
- the transformation closure which can take one (Map.Entry) or two (key, value) parameters Iterates through this Map transforming each map entry using the transform
closure
returning a map of the transformed entries.
assert [a:1, b:2].collectEntries([:]) { k, v -> Map.entry(v, k) } == [1:'a', 2:'b'] assert [a:1, b:2].collectEntries([30:'C']) { key, value -> [(value*10): key.toUpperCase()] } == [10:'A', 20:'B', 30:'C']Note: When using the list-style of result, the behavior is '
def (key, value) = listResultFromClosure
'.
While we strongly discourage using a list of size other than 2, Groovy's normal semantics apply in this case;
throwing away elements after the second one and using null for the key or value for the case of a shortened list.
If your collector Map doesn't support null keys or values, you might get a runtime error, e.g. NullPointerException or IllegalArgumentException.
self
- a Mapcollector
- the Map into which the transformed entries are puttransform
- the closure used for transforming, which can take one (Map.Entry) or two (key, value) parameters and
should return a Map.Entry, a Map or a two-element list containing the resulting key and value Iterates through this Map transforming each entry using the transform
closure
and returning a map of the transformed entries.
assert [a:1, b:2].collectEntries { key, value -> [value, key] } == [1:'a', 2:'b'] assert [a:1, b:2].collectEntries { key, value -> [(value*10): key.toUpperCase()] } == [10:'A', 20:'B']Note: When using the list-style of result, the behavior is '
def (key, value) = listResultFromClosure
'.
While we strongly discourage using a list of size other than 2, Groovy's normal semantics apply in this case;
throwing away elements after the second one and using null for the key or value for the case of a shortened list.
If your Map doesn't support null keys or values, you might get a runtime error, e.g. NullPointerException or IllegalArgumentException.
self
- a Maptransform
- the closure used for transforming, which can take one (Map.Entry) or two (key, value) parameters and
should return a Map.Entry, a Map or a two-element list containing the resulting key and valueA variant of collectEntries for Iterators.
self
- an Iteratortransform
- the closure used for transforming, which has an item from self as the parameter and
should return a Map.Entry, a Map or a two-element list containing the resulting key and value Iterates through this Iterable transforming each item using the transform
closure
and returning a map of the resulting transformed entries.
def letters = "abc" // collect letters with index using list style assert (0..2).collectEntries { index -> [index, letters[index]] } == [0:'a', 1:'b', 2:'c'] // collect letters with index using map style assert (0..2).collectEntries { index -> [(index): letters[index]] } == [0:'a', 1:'b', 2:'c']Note: When using the list-style of result, the behavior is '
def (key, value) = listResultFromClosure
'.
While we strongly discourage using a list of size other than 2, Groovy's normal semantics apply in this case;
throwing away elements after the second one and using null for the key or value for the case of a shortened list.
self
- an Iterabletransform
- the closure used for transforming, which has an item from self as the parameter and
should return a Map.Entry, a Map or a two-element list containing the resulting key and valueA variant of collectEntries for Iterators using the identity closure as the transform.
self
- an Iterator A variant of collectEntries for Iterable objects using the identity closure as the transform.
The source Iterable should contain a list of [key, value]
tuples or Map.Entry
objects.
def nums = [1, 10, 100, 1000] def tuples = nums.collect{ [it, it.toString().size()] } assert tuples == [[1, 1], [10, 2], [100, 3], [1000, 4]] def map = tuples.collectEntries() assert map == [1:1, 10:2, 100:3, 1000:4]
self
- an IterableA variant of collectEntries for Iterators using a supplied map as the destination of transformed entries.
self
- an Iteratorcollector
- the Map into which the transformed entries are puttransform
- the closure used for transforming, which has an item from self as the parameter and
should return a Map.Entry, a Map or a two-element list containing the resulting key and valueA variant of collectEntries for Iterators with separate functions for transforming the keys and values. The supplied collector map is used as the destination for transformed entries.
self
- an Iteratorcollector
- the Map into which the transformed entries are putkeyTransform
- a function for transforming Iterator elements into keysvalueTransform
- a function for transforming Iterator elements into valuesA variant of collectEntries for Iterators with separate functions for transforming the keys and values.
self
- an IteratorkeyTransform
- a function for transforming Iterator elements into keysvalueTransform
- a function for transforming Iterator elements into valuesA variant of collectEntries for Iterables with separate functions for transforming the keys and values. The supplied collector map is used as the destination for transformed entries.
def languages = ['Groovy', 'Java', 'Kotlin', 'Scala'] assert languages.collectEntries([clojure:7], String::toLowerCase, String::size) == [clojure:7, groovy:6, java:4, kotlin:6, scala:5]
self
- an Iterablecollector
- the Map into which the transformed entries are putkeyTransform
- a function for transforming Iterable elements into keysvalueTransform
- a function for transforming Iterable elements into valuesA variant of collectEntries for Iterables with separate functions for transforming the keys and values.
def languages = ['Groovy', 'Java', 'Kotlin', 'Scala'] assert languages.collectEntries(String::toLowerCase, String::size) == [groovy:6, java:4, kotlin:6, scala:5]
self
- an IterablekeyTransform
- a function for transforming Iterable elements into keysvalueTransform
- a function for transforming Iterable elements into valuesA variant of collectEntries for Maps with separate functions for transforming the keys and values. The supplied collector map is used as the destination for transformed entries.
self
- a Mapcollector
- the Map into which the transformed entries are putkeyTransform
- a function for transforming Map keysvalueTransform
- a function for transforming Map valuesA variant of collectEntries for Maps with separate functions for transforming the keys and values.
self
- a MapkeyTransform
- a function for transforming Map keysvalueTransform
- a function for transforming Map valuesIterates through this Iterable transforming each item using the closure as a transformer into a map entry, returning the supplied map with all the transformed entries added to it.
def letters = "abc" // collect letters with index assert (0..2).collectEntries( [:] ) { index -> [index, letters[index]] } == [0:'a', 1:'b', 2:'c'] assert (0..2).collectEntries( [4:'d'] ) { index -> [(index+1): letters[index]] } == [1:'a', 2:'b', 3:'c', 4:'d']Note: When using the list-style of result, the behavior is '
def (key, value) = listResultFromClosure
'.
While we strongly discourage using a list of size other than 2, Groovy's normal semantics apply in this case;
throwing away elements after the second one and using null for the key or value for the case of a shortened list.
If your collector Map doesn't support null keys or values, you might get a runtime error, e.g. NullPointerException or IllegalArgumentException.
self
- an Iterablecollector
- the Map into which the transformed entries are puttransform
- the closure used for transforming, which has an item from self as the parameter and
should return a Map.Entry, a Map or a two-element list containing the resulting key and valueA variant of collectEntries for Iterators using the identity closure as the transform and a supplied map as the destination of transformed entries.
self
- an Iteratorcollector
- the Map into which the transformed entries are putA variant of collectEntries for Iterables using the identity closure as the transform and a supplied map as the destination of transformed entries.
self
- an Iterablecollector
- the Map into which the transformed entries are putTransform a Maps' keys leaving the values unchanged. Similar to withCollectedKeys(Iterable, Map, Function) but for Maps.
def lengths = [Groovy:6, Java:4, Kotlin:6, Scala:5] def firstLetter = (s) -> s[0] assert lengths.collectKeys([C:7], firstLetter) == [C:7, G:6, J:4, K:6, S:5]
keys
- a Mapcollector
- the Map into which the transformed entries are putkeyTransform
- a function for transforming Map keysTransform a Maps' keys leaving the values unchanged. Similar to withCollectedKeys(Iterable, Function) but for Maps.
def lengths = [Groovy:6, Java:4, Kotlin:6, Scala:5] def firstLetter = (s) -> s[0] assert lengths.collectKeys(firstLetter) == [G:6, J:4, K:6, S:5]
keys
- a MapkeyTransform
- a function for transforming Map keysProjects each item from a source Iterable to a collection and concatenates (flattens) the resulting collections into a single list.
def nums = 1..10
def squaresAndCubesOfEvens = nums.collectMany{ it % 2 ? [] : [it**2, it**3] }
assert squaresAndCubesOfEvens == [4, 8, 16, 64, 36, 216, 64, 512, 100, 1000]
def animals = ['CAT', 'DOG', 'ELEPHANT'] as Set
def smallAnimals = animals.collectMany{ it.size() >
3 ? [] : [it.toLowerCase()] }
assert smallAnimals == ['cat', 'dog']
def orig = nums as Set
def origPlusIncrements = orig.collectMany{ [it, it+1] }
assert origPlusIncrements.size() == orig.size() * 2
assert origPlusIncrements.unique().size() == orig.size() + 1
self
- an Iterableprojection
- a projecting Closure returning a collection of items Projects each item from a source collection to a result collection and concatenates (flattens) the resulting
collections adding them into the collector
.
def animals = ['CAT', 'DOG', 'ELEPHANT'] def smallAnimals = animals.collectMany(['ant', 'bee']){ it.size() > 3 ? [] : [it.toLowerCase()] } assert smallAnimals == ['ant', 'bee', 'cat', 'dog'] def nums = 1..5 def origPlusIncrements = nums.collectMany([] as Set){ [it, it+1] } assert origPlusIncrements.size() == nums.size() + 1 @groovy.transform.TypeChecked void test() { LinkedHashSet<String> lhs = ['abc','def'].collectMany(new LinkedHashSet<>()){ it.iterator().collect() } assert lhs == ['a','b','c','d','e','f'] as Set<String> } test()
self
- an Iterablecollector
- an initial collection to add the projected items toprojection
- a projecting Closure returning a collection of items Projects each item from a source map to a result collection and concatenates (flattens) the resulting
collections adding them into the collector
.
def map = [bread:3, milk:5, butter:2]
def result = map.collectMany(['x']){ k, v ->
if (k.startsWith('b')) k.toList() }
assert result == ['x', 'b', 'r', 'e', 'a', 'd', 'b', 'u', 't', 't', 'e', 'r']
self
- a mapcollector
- an initial collection to add the projected items toprojection
- a projecting Closure returning a collection of itemsProjects each item from a source map to a result collection and concatenates (flattens) the resulting collections adding them into a collection.
def map = [bread:3, milk:5, butter:2]
def result = map.collectMany{ k, v ->
k.startsWith('b') ? k.toList() : [] }
assert result == ['b', 'r', 'e', 'a', 'd', 'b', 'u', 't', 't', 'e', 'r']
self
- a mapprojection
- a projecting Closure returning a collection of itemsProjects each item from a source iterator to a collection and concatenates (flattens) the resulting collections into a single list.
def numsIter = [1, 2, 3, 4, 5, 6].iterator() def squaresAndCubesOfEvens = numsIter.collectMany{ if (it % 2 == 0) [it**2, it**3] } assert squaresAndCubesOfEvens == [4, 8, 16, 64, 36, 216]
var letters = 'a'..'z' var pairs = letters.collectMany{ a -> letters.collectMany{ b -> if (a != b) ["$a$b"] } } assert pairs.join(',').matches('ab,ac,ad,.*,zw,zx,zy')
self
- an iteratorcollector
- an initial collection to add the projected items toprojection
- a projecting Closure returning a collection of itemsProjects each item from a source iterator to a collection and concatenates (flattens) the resulting collections into a single list.
def numsIter = [1, 2, 3, 4, 5, 6].iterator() def squaresAndCubesOfEvens = numsIter.collectMany{ it % 2 ? [] : [it**2, it**3] } assert squaresAndCubesOfEvens == [4, 8, 16, 64, 36, 216]
self
- an iteratorprojection
- a projecting Closure returning a collection of itemsRecursively iterates through this collection transforming each non-Collection value into a new value using the closure as a transformer. Returns a potentially nested list of transformed values.
assert [2,[4,6],[8],[]] == [1,[2,3],[4],[]].collectNested { it * 2 }
self
- a collectiontransform
- the closure used to transform each item of the collectionRecursively iterates through this Iterable transforming each non-Collection value into a new value using the closure as a transformer. Returns a potentially nested list of transformed values.
assert [2,[4,6],[8],[]] == [1,[2,3],[4],[]].collectNested { it * 2 }
self
- an Iterabletransform
- the closure used to transform each item of the Iterable Recursively iterates through this Iterable transforming each non-Collection value
into a new value using the transform
closure. Returns a potentially nested
collection of transformed values.
def x = [1,[2,3],[4],[]].collectNested(new Vector()) { it * 2 } assert x == [2,[4,6],[8],[]] assert x instanceof Vector
self
- an Iterablecollector
- an initial Collection to which the transformed values are addedtransform
- the closure used to transform each element of the IterableTransform a Maps' values leaving the keys unchanged. Similar to withCollectedValues(Iterable, Map, Function) but for Maps.
def lengths = [Groovy:6, Java:4, Kotlin:6, Scala:5] def squared = (e) -> e ** 2 assert lengths.collectValues([Clojure:49], squared) == [Clojure:49, Groovy:36, Java:16, Kotlin:36, Scala:25]
keys
- a Mapcollector
- the Map into which the transformed entries are putvalueTransform
- a function for transforming Map valuesTransform a Maps' values leaving the keys unchanged. Similar to withCollectedValues(Iterable, Function) but for Maps.
def lengths = [Groovy:6, Java:4, Kotlin:6, Scala:5] def squared = (e) -> e ** 2 assert lengths.collectValues(squared) == [Groovy:36, Java:16, Kotlin:36, Scala:25]
keys
- a MapvalueTransform
- a function for transforming Map valuesFinds all combinations of items from the given aggregate of collections.
Example usage:
result = [['a', 'b'], [1, 2, 3]].combinations() assert result == [['a', 1], ['b', 1], ['a', 2], ['b', 2], ['a', 3], ['b', 3]]
self
- an iterable of collectionsFinds all combinations of items from the given aggregate of collections, then returns the results of the supplied transform.
Example usage:
result = [[2, 3], [4, 5, 6]].combinations { x,y ->
x*y }
assert result == [8, 12, 10, 15, 12, 18]
self
- an iterable of collectionsfunction
- a closure to be called on each combination (list)Compares a Character and a Number. The ordinal value of the Character is used in the comparison (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Characterright
- a NumberCompares a Number and a Character. The ordinal value of the Character is used in the comparison (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Numberright
- a CharacterCompares two Characters. The ordinal values of the Characters are compared (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Characterright
- a CharacterCompares two Numbers. Equality (==) for numbers dispatches to this.
left
- a Numberright
- another Number to compare toReturns true if this iterable contains the item.
self
- an Iterable to be checked for containmentitem
- an Object to be checked for containment in this iterableReturns true if this iterable contains all the elements in the specified array.
self
- an Iterable to be checked for containmentitems
- array to be checked for containment in this iterable Counts the number of occurrences of the given value from the
items within this Iterator.
Comparison is done using Groovy's == operator (using
compareTo(value) == 0
or equals(value)
).
The iterator will become exhausted of elements after determining the count value.
self
- the Iterator from which we count the number of matching occurrencesvalue
- the value being searched forCounts the number of occurrences which satisfy the given closure from the items within this Iterator. The iterator will become exhausted of elements after determining the count value.
Example usage:
assert [2,4,2,1,3,5,2,4,3].toSet().iterator().count{ it % 2 == 0 } == 2
self
- the Iterator from which we count the number of matching occurrencesclosure
- a closure conditionCounts the number of occurrences which satisfy the given closure from the items within this Iterator, adding the count to the initial count. The iterator will become exhausted of elements after determining the count value.
Example usage:
assert [2,4,2,1,3,5,2,4,3].toSet().iterator().count(100){ it % 2 == 0 } == 102
self
- the Iterator from which we count the number of matching occurrencesinitialCount
- start counting from this valueclosure
- a closure condition Counts the number of occurrences of the given value inside this Iterable.
Comparison is done using Groovy's == operator (using
compareTo(value) == 0
or equals(value)
).
Example usage:
assert [2,4,2,1,3,5,2,4,3].count(4) == 2
self
- the Iterable within which we count the number of occurrencesvalue
- the value being searched forCounts the number of occurrences which satisfy the given closure from inside this Iterable.
Example usage:
assert [2,4,2,1,3,5,2,4,3].count{ it % 2 == 0 } == 5
self
- the Iterable within which we count the number of occurrencesclosure
- a closure conditionCounts the number of occurrences which satisfy the given closure from inside this Iterable.
Example usage:
assert [2,4,2,1,3,5,2,4,3].count(100L){ it % 2 == 0 } == 105L
self
- the Iterable within which we count the number of occurrencesinitialCount
- start counting from this valueclosure
- a closure conditionCounts the number of occurrences which satisfy the given closure from inside this map. If the closure takes one parameter then it will be passed the Map.Entry. Otherwise, the closure should take two parameters and will be passed the key and value.
Example usage:
assert [a:1, b:1, c:2, d:2].count{ k,v->
k == 'a'||
v == 2 } == 3
self
- the map within which we count the number of occurrencesclosure
- a 1 or 2 arg Closure condition applying on the entriesCounts the number of occurrences which satisfy the given closure from inside this map. If the closure takes one parameter then it will be passed the Map.Entry. Otherwise, the closure should take two parameters and will be passed the key and value.
Example usage:
assert [a:1, b:1, c:2, d:2].count(100G){ k,v->
k == 'a'||
v == 2 } == 103G
self
- the map within which we count the number of occurrencesinitialCount
- start counting from this valueclosure
- a 1 or 2 arg Closure condition applying on the entriesSorts all collection members into groups determined by the supplied mapping closure and counts the group size. The closure should return the key that each item should be grouped by. The returned Map will have an entry for each distinct key returned from the closure, with each value being the frequency of items occurring for that group.
Example usage:
assert [0:2, 1:3] == [1,2,3,4,5].countBy { it % 2 }
self
- a collection to group and countclosure
- a closure mapping items to the frequency keysCreates a multiset-like map of the collection members.
Example usage:
assert [1:2, 2:2, 3:1] == [1,2,1,2,3].countBy()
self
- a collection to group and countSorts all iterator items into groups determined by the supplied mapping closure and counts the group size. The closure should return the key that each item should be grouped by. The returned Map will have an entry for each distinct key returned from the closure, with each value being the frequency of items occurring for that group.
Example usage:
assert [1,2,2,2,3].toSet().iterator().countBy{ it % 2 } == [1:2, 0:1]
self
- an iterator to group and countclosure
- a closure mapping items to the frequency keysCreates a multiset-like map of the iterator members.
Example usage:
assert [1:2, 2:2, 3:1] == [1,2,1,2,3].iterator().countBy()
self
- an iterator to group and countGroups the members of a map into groups determined by the supplied mapping closure and counts the frequency of the created groups. The closure will be passed a Map.Entry or key and value (depending on the number of parameters the closure accepts) and should return the key that each item should be grouped under. The resulting map will have an entry for each 'group' key returned by the closure, with values being the frequency counts for that 'group'.
def result = [a:1,b:2,c:3,d:4,e:5].countBy { it.value % 2 } assert result == [0:2, 1:3]
self
- a map to group and countclosure
- a closure mapping entries to frequency count keys Returns true
if the intersection of two iterables is empty.
assert [1,2,3].disjoint([3,4,5]) == false
assert [1,2].disjoint([3,4]) == true
left
- an Iterableright
- an Iterabletrue
if the intersection of two iterables
is empty, false
otherwise.Divide a Character by a Number. The ordinal value of the Character is used in the division (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Characterright
- a NumberDivide a Number by a Character. The ordinal value of the Character is used in the division (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Numberright
- a CharacterDivide one Character by another. The ordinal values of the Characters are used in the division (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Characterright
- another CharacterIterates from this number down to the given number, inclusive, decrementing by one each time.
self
- a Numberto
- another Number to go down toclosure
- the closure to callIterates from this number down to the given number, inclusive, decrementing by one each time.
self
- a longto
- the end numberclosure
- the code to execute for each numberIterates from this number down to the given number, inclusive, decrementing by one each time.
self
- a Longto
- the end numberclosure
- the code to execute for each numberIterates from this number down to the given number, inclusive, decrementing by one each time.
self
- a floatto
- the end numberclosure
- the code to execute for each numberIterates from this number down to the given number, inclusive, decrementing by one each time.
self
- a Floatto
- the end numberclosure
- the code to execute for each numberIterates from this number down to the given number, inclusive, decrementing by one each time.
self
- a doubleto
- the end numberclosure
- the code to execute for each numberIterates from this number down to the given number, inclusive, decrementing by one each time.
self
- a Doubleto
- the end numberclosure
- the code to execute for each numberIterates from this number down to the given number, inclusive, decrementing by one each time.
self
- a BigIntegerto
- the end numberclosure
- the code to execute for each numberIterates from this number down to the given number, inclusive, decrementing by one each time. Each number is passed to the closure. Example:
10.5.downto(0) { println it }Prints numbers 10.5, 9.5 ... to 0.5.
self
- a BigDecimalto
- the end numberclosure
- the code to execute for each numberDrops the given number of elements from the head of this List.
def strings = [ 'a', 'b', 'c' ] as SortedSet assert strings.drop( 0 ) == [ 'a', 'b', 'c' ] as SortedSet assert strings.drop( 2 ) == [ 'c' ] as SortedSet assert strings.drop( 5 ) == [] as SortedSet
self
- the original SortedSetnum
- the number of elements to drop from this Iterablenum
elements,
or an empty list if it has less than num
elements.Drops the given number of elements from the head of this List.
def strings = [ 'a', 'b', 'c' ] assert strings.drop( 0 ) == [ 'a', 'b', 'c' ] assert strings.drop( 2 ) == [ 'c' ] assert strings.drop( 5 ) == []
self
- the original Listnum
- the number of elements to drop from this Iterablenum
elements,
or an empty list if it has less than num
elements.Drops the given number of elements from the head of this Iterable.
def strings = [ 'a', 'b', 'c' ] assert strings.drop( 0 ) == [ 'a', 'b', 'c' ] assert strings.drop( 2 ) == [ 'c' ] assert strings.drop( 5 ) == [] class AbcIterable implements Iterable{ Iterator iterator() { "abc".iterator() } } def abc = new AbcIterable() assert abc.drop(0) == ['a', 'b', 'c'] assert abc.drop(1) == ['b', 'c'] assert abc.drop(3) == [] assert abc.drop(5) == []
self
- the original Iterablenum
- the number of elements to drop from this Iterablenum
elements,
or an empty list if it has less than num
elements.Drops the given number of key/value pairs from the head of this map if they are available.
def strings = [ 'a':10, 'b':20, 'c':30 ] assert strings.drop( 0 ) == [ 'a':10, 'b':20, 'c':30 ] assert strings.drop( 2 ) == [ 'c':30 ] assert strings.drop( 5 ) == [:]If the map instance does not have ordered keys, then this function could drop a random
num
entries. Groovy by default uses LinkedHashMap, so this shouldn't be an issue in the main.
self
- the original mapnum
- the number of elements to drop from this mapnum
ones, or else the empty map, if this map has
less than num
elements. Drops the given number of elements from the head of this iterator if they are available.
The original iterator is stepped along by num
elements.
def iteratorCompare( Iterator a, List b ) { a.collect { it } == b } def iter = [ 1, 2, 3, 4, 5 ].listIterator() assert iteratorCompare( iter.drop( 0 ), [ 1, 2, 3, 4, 5 ] ) iter = [ 1, 2, 3, 4, 5 ].listIterator() assert iteratorCompare( iter.drop( 2 ), [ 3, 4, 5 ] ) iter = [ 1, 2, 3, 4, 5 ].listIterator() assert iteratorCompare( iter.drop( 5 ), [] )
self
- the original iteratornum
- the number of elements to drop from this iteratornum
elements if they exist.Drops the given number of elements from the tail of this SortedSet.
def strings = [ 'a', 'b', 'c' ] as SortedSet assert strings.dropRight( 0 ) == [ 'a', 'b', 'c' ] as SortedSet assert strings.dropRight( 2 ) == [ 'a' ] as SortedSet assert strings.dropRight( 5 ) == [] as SortedSet
self
- the original SortedSetnum
- the number of elements to drop from this SortedSetnum
elements,
or an empty SortedSet if it has less than num
elements.Drops the given number of elements from the tail of this List.
def strings = [ 'a', 'b', 'c' ] assert strings.dropRight( 0 ) == [ 'a', 'b', 'c' ] assert strings.dropRight( 2 ) == [ 'a' ] assert strings.dropRight( 5 ) == []
self
- the original Listnum
- the number of elements to drop from this Listnum
elements,
or an empty List if it has less than num
elements.Drops the given number of elements from the tail of this Iterable.
def strings = [ 'a', 'b', 'c' ] assert strings.dropRight( 0 ) == [ 'a', 'b', 'c' ] assert strings.dropRight( 2 ) == [ 'a' ] assert strings.dropRight( 5 ) == [] class AbcIterable implements Iterable{ Iterator iterator() { "abc".iterator() } } def abc = new AbcIterable() assert abc.dropRight(0) == ['a', 'b', 'c'] assert abc.dropRight(1) == ['a', 'b'] assert abc.dropRight(3) == [] assert abc.dropRight(5) == []
self
- the original Iterablenum
- the number of elements to drop from this Iterablenum
elements,
or an empty list if it has less than num
elements.Drops the given number of elements from the tail of this Iterator.
def getObliterator() { "obliter8".iterator() } assert obliterator.dropRight(-1).toList() == ['o', 'b', 'l', 'i', 't', 'e', 'r', '8'] assert obliterator.dropRight(0).toList() == ['o', 'b', 'l', 'i', 't', 'e', 'r', '8'] assert obliterator.dropRight(1).toList() == ['o', 'b', 'l', 'i', 't', 'e', 'r'] assert obliterator.dropRight(4).toList() == ['o', 'b', 'l', 'i'] assert obliterator.dropRight(7).toList() == ['o'] assert obliterator.dropRight(8).toList() == [] assert obliterator.dropRight(9).toList() == []
self
- the original Iteratornum
- the number of elements to dropnum
elements,
or an empty Iterator if it has less than num
elements.Returns a suffix of this SortedSet where elements are dropped from the front while the given Closure evaluates to true. Similar to dropWhile(Iterable, groovy.lang.Closure) except that it attempts to preserve the type of the original SortedSet.
def nums = [ 1, 2, 3 ] as SortedSet assert nums.dropWhile{ it<
4 } == [] as SortedSet assert nums.dropWhile{ it<
2 } == [ 2, 3 ] as SortedSet assert nums.dropWhile{ it != 3 } == [ 3 ] as SortedSet assert nums.dropWhile{ it == 0 } == [ 1, 2, 3 ] as SortedSet
self
- the original SortedSetcondition
- the closure that must evaluate to true to continue dropping elementsReturns a suffix of this List where elements are dropped from the front while the given Closure evaluates to true. Similar to dropWhile(Iterable, groovy.lang.Closure) except that it attempts to preserve the type of the original list.
def nums = [ 1, 3, 2 ] assert nums.dropWhile{ it<
4 } == [] assert nums.dropWhile{ it<
3 } == [ 3, 2 ] assert nums.dropWhile{ it != 2 } == [ 2 ] assert nums.dropWhile{ it == 0 } == [ 1, 3, 2 ]
self
- the original listcondition
- the closure that must evaluate to true to continue dropping elementsReturns a suffix of this Iterable where elements are dropped from the front while the given closure evaluates to true.
class HorseIterable implements Iterable{ Iterator iterator() { "horse".iterator() } } def horse = new HorseIterable() assert horse.dropWhile{ it <
'r' } == ['r', 's', 'e'] assert horse.dropWhile{ it<=
'r' } == ['s', 'e']
self
- an Iterablecondition
- the closure that must evaluate to true to continue dropping elementsCreate a suffix of the given Map by dropping as many entries as possible from the front of the original Map such that calling the given closure condition evaluates to true when passed each of the dropped entries (or key/value pairs).
def shopping = [milk:1, bread:2, chocolate:3] assert shopping.dropWhile{ it.key.size()If the map instance does not have ordered keys, then this function could appear to drop random entries. Groovy by default uses LinkedHashMap, so this shouldn't be an issue in the main.<
6 } == [chocolate:3] assert shopping.dropWhile{ it.value % 2 } == [bread:2, chocolate:3] assert shopping.dropWhile{ k, v->
k.size() + v<=
7 } == [chocolate:3]
self
- a Mapcondition
- a 1 (or 2) arg Closure that must evaluate to true for the
entry (or key and value) to continue dropping elementsCreates an Iterator that returns a suffix of the elements from an original Iterator. As many elements as possible are dropped from the front of the original Iterator such that calling the given closure condition evaluates to true when passed each of the dropped elements.
def a = 0 def iter = [ hasNext:{ a<
10 }, next:{ a++ } ] as Iterator assert [].iterator().dropWhile{ it<
3 }.toList() == [] assert [1, 2, 3, 4, 5].iterator().dropWhile{ it<
3 }.toList() == [ 3, 4, 5 ] assert iter.dropWhile{ it<
5 }.toList() == [ 5, 6, 7, 8, 9 ]
self
- the Iteratorcondition
- the closure that must evaluate to true to continue dropping elementsGenerates a detailed dump string of an object showing its class, hashCode and all accessible fields.
self
- an objectIterates through an aggregate type or data structure, passing each item to the given closure. Custom types may utilize this method by simply providing an "iterator()" method. The items returned from the resulting iterator will be passed to the closure.
String result = '' ['a', 'b', 'c'].each{ result += it } assert result == 'abc'
self
- the object over which we iterateclosure
- the closure applied on each element foundIterates through an Iterable, passing each item to the given closure.
self
- the Iterable over which we iterateclosure
- the closure applied on each element foundIterates through an Iterator, passing each item to the given closure.
self
- the Iterator over which we iterateclosure
- the closure applied on each element foundIterates through a Collection, passing each item to the given closure.
self
- the Collection over which we iterateclosure
- the closure applied on each element foundIterates through a List, passing each item to the given closure.
self
- the List over which we iterateclosure
- the closure applied on each element foundIterates through a Set, passing each item to the given closure.
self
- the Set over which we iterateclosure
- the closure applied on each element foundIterates through a SortedSet, passing each item to the given closure.
self
- the SortedSet over which we iterateclosure
- the closure applied on each element foundAllows a Map to be iterated through using a closure. If the closure takes one parameter then it will be passed the Map.Entry otherwise if the closure takes two parameters then it will be passed the key and the value.
def result = ""
[a:1, b:3].each { key, value ->
result += "$key$value" }
assert result == "a1b3"
def result = ""
[a:1, b:3].each { entry ->
result += entry }
assert result == "a=1b=3"
In general, the order in which the map contents are processed
cannot be guaranteed. In practise, specialized forms of Map,
e.g. a TreeMap will have its contents processed according to
the natural ordering of the map.
self
- the map over which we iterateclosure
- the 1 or 2 arg closure applied on each entry of the mapApplies a function on each combination of the input lists.
Example usage:
[[2, 3],[4, 5, 6]].eachCombination { println "Found $it" }
self
- a Collection of listsfunction
- a closure to be called on each combinationIterates over all permutations of a collection, running a closure for each iteration.
Example usage:
def permutations = [] [1, 2, 3].eachPermutation{ permutations << it } assert permutations == [[1, 2, 3], [1, 3, 2], [2, 1, 3], [2, 3, 1], [3, 1, 2], [3, 2, 1]]
self
- the Collection of itemsclosure
- the closure to call for each permutationIterates through an aggregate type or data structure, passing each item and the item's index (a counter starting at zero) to the given closure.
String result = ''
['a', 'b', 'c'].eachWithIndex{ letter, index ->
result += "$index:$letter" }
assert result == '0:a1:b2:c'
self
- an Objectclosure
- a Closure to operate on each itemIterates through an iterable type, passing each item and the item's index (a counter starting at zero) to the given closure.
self
- an Iterableclosure
- a Closure to operate on each itemIterates through an iterator type, passing each item and the item's index (a counter starting at zero) to the given closure.
self
- an Iteratorclosure
- a Closure to operate on each itemIterates through a Collection, passing each item and the item's index (a counter starting at zero) to the given closure.
self
- a Collectionclosure
- a Closure to operate on each itemIterates through a List, passing each item and the item's index (a counter starting at zero) to the given closure.
self
- a Listclosure
- a Closure to operate on each itemIterates through a Set, passing each item and the item's index (a counter starting at zero) to the given closure.
self
- a Setclosure
- a Closure to operate on each itemIterates through a SortedSet, passing each item and the item's index (a counter starting at zero) to the given closure.
self
- a SortedSetclosure
- a Closure to operate on each itemAllows a Map to be iterated through using a closure. If the closure takes two parameters then it will be passed the Map.Entry and the item's index (a counter starting at zero) otherwise if the closure takes three parameters then it will be passed the key, the value, and the index.
def result = ""
[a:1, b:3].eachWithIndex { key, value, index ->
result += "$index($key$value)" }
assert result == "0(a1)1(b3)"
def result = ""
[a:1, b:3].eachWithIndex { entry, index ->
result += "$index($entry)" }
assert result == "0(a=1)1(b=3)"
self
- the map over which we iterateclosure
- a 2 or 3 arg Closure to operate on each item Determines if the contents of this list are equal to the
contents of the given array in the same order. This returns
false
if either collection is null
.
assert [1, "a"].equals( [ 1, "a" ] as Object[] )
left
- a Listright
- the Object[] being compared to Compare the contents of two Lists. Order matters.
If numbers exist in the Lists, then they are compared as numbers,
for example 2 == 2L. If both lists are null
, the result
is true; otherwise if either list is null
, the result
is false
.
assert ["a", 2].equals(["a", 2]) assert ![2, "a"].equals("a", 2) assert [2.0, "a"].equals(2L, "a") // number comparison at work
left
- a Listright
- the List being compared totrue
if the contents of both lists are identical,
false
otherwise.Compare the contents of two Sets for equality using Groovy's coercion rules.
Returns true if the two sets have the same size, and every member
of the specified set is contained in this set (or equivalently, every member
of this set is contained in the specified set).
If numbers exist in the sets, then they are compared as numbers,
for example 2 == 2L. If both sets are null
, the result
is true; otherwise if either set is null
, the result
is false
. Example usage:
Set s1 = ["a", 2] def s2 = [2, 'a'] as Set Set s3 = [3, 'a'] def s4 = [2.0, 'a'] as Set def s5 = [2L, 'a'] as Set assert s1.equals(s2) assert !s1.equals(s3) assert s1.equals(s4) assert s1.equals(s5)
self
- a Setother
- the Set being compared toCompares two Maps treating coerced numerical values as identical.
Example usage:
assert [a:2, b:3] == [a:2L, b:3.0]
self
- this Mapother
- the Map being compared toCompares this object against the specified object returning the same result as Float.equals but returning true if this object and the specified object are both zero and negative zero respectively or vice versa.
Compares this object against the specified object returning the same result as Double.equals but returning true if this object and the specified object are both zero and negative zero respectively or vice versa.
Used to determine if the given predicate closure is valid (i.e. returns
true
for all items in this data structure).
A simple example for a list:
def list = [3,4,5]
def greaterThanTwo = list.every { it >
2 }
self
- the object over which we iteratepredicate
- the closure predicate used for matching Used to determine if the given predicate closure is valid (i.e. returns
true
for all items in this iterator).
A simple example for a list:
def list = [3,4,5]
def greaterThanTwo = list.iterator().every { it >
2 }
self
- the iterator over which we iteratepredicate
- the closure predicate used for matching Used to determine if the given predicate closure is valid (i.e. returns
true
for all items in this iterable).
A simple example for a list:
def list = [3,4,5]
def greaterThanTwo = list.every { it >
2 }
self
- the iterable over which we iteratepredicate
- the closure predicate used for matchingIterates over the entries of a map, and checks whether a predicate is valid for all entries. If the closure takes one parameter then it will be passed the Map.Entry otherwise if the closure takes two parameters then it will be passed the key and the value.
def map = [a:1, b:2.0, c:2L] assert !map.every { key, value->
value instanceof Integer } assert map.every { entry->
entry.value instanceof Number }
self
- the map over which we iteratepredicate
- the 1 or 2 arg Closure predicate used for matching Iterates over every element of a collection, and checks whether all
elements are true
according to the Groovy Truth.
Equivalent to self.every({element
->
element})
assert [true, true].every() assert [1, 1].every() assert ![1, 0].every()
self
- the object over which we iterateFinds the first value matching the closure condition.
def numbers = [1, 2, 3]
def result = numbers.find { it >
1}
assert result == 2
self
- an Object with an iterator returning its valuesclosure
- a closure conditionFinds the first item matching the IDENTITY Closure (i.e. matching Groovy truth).
Example:
def items = [null, 0, 0.0, false, '', [], 42, 43] assert items.find() == 42
self
- an Object with an Iterator returning its valuesFinds the first value matching the closure condition. Example:
def list = [1,2,3]
assert 2 == list.find { it >
1 }
self
- a Collectionclosure
- a closure conditionFinds the first item matching the IDENTITY Closure (i.e. matching Groovy truth).
Example:
def items = [null, 0, 0.0, false, '', [], 42, 43] assert items.find() == 42
self
- a CollectionFinds the first entry matching the closure condition. If the closure takes two parameters, the entry key and value are passed. If the closure takes one parameter, the Map.Entry object is passed.
assert [a:1, b:3].find { it.value == 3 }.key == "b"
self
- a Mapclosure
- a 1 or 2 arg Closure conditionFinds all entries matching the closure condition. If the closure takes one parameter then it will be passed the Map.Entry. Otherwise if the closure should take two parameters, which will be the key and the value.
If the self
map is one of TreeMap, LinkedHashMap, Hashtable
or Properties, the returned Map will preserve that type, otherwise a HashMap will
be returned.
Example usage:
def result = [a:1, b:2, c:4, d:5].findAll { it.value % 2 == 0 } assert result.every { it instanceof Map.Entry } assert result*.key == ["b", "c"] assert result*.value == [2, 4]
self
- a Mapclosure
- a 1 or 2 arg Closure condition applying on the entriesFinds all values matching the closure condition.
assert ([2,4] as Set) == ([1,2,3,4] as Set).findAll { it % 2 == 0 }
self
- a Setclosure
- a closure conditionFinds all values matching the closure condition.
assert [2,4] == [1,2,3,4].findAll { it % 2 == 0 }
self
- a Listclosure
- a closure conditionFinds all values matching the closure condition.
assert [2,4] == [1,2,3,4].findAll { it % 2 == 0 }
self
- a Collectionclosure
- a closure conditionFinds the items matching the IDENTITY Closure (i.e. matching Groovy truth).
Example:
def items = [1, 2, 0, false, true, '', 'foo', [], [4, 5], null] as Set assert items.findAll() == [1, 2, true, 'foo', [4, 5]] as Set
self
- a SetFinds the items matching the IDENTITY Closure (i.e. matching Groovy truth).
Example:
def items = [1, 2, 0, false, true, '', 'foo', [], [4, 5], null] assert items.findAll() == [1, 2, true, 'foo', [4, 5]]
self
- a ListFinds the items matching the IDENTITY Closure (i.e. matching Groovy truth).
Example:
def items = [1, 2, 0, false, true, '', 'foo', [], [4, 5], null] assert items.findAll() == [1, 2, true, 'foo', [4, 5]]
self
- a CollectionFinds all items matching the closure condition.
self
- an Object with an Iterator returning its valuesclosure
- a closure conditionFinds all items matching the IDENTITY Closure (i.e. matching Groovy truth).
Example:
def items = [1, 2, 0, false, true, '', 'foo', [], [4, 5], null] assert items.findAll() == [1, 2, true, 'foo', [4, 5]]
self
- an Object with an Iterator returning its valuesIterates over the elements of an aggregate of items and returns the index of the first item that matches the condition specified in the closure.
self
- the iteration object over which to iteratecondition
- the matching condition Iterates over the elements of an aggregate of items, starting from a
specified startIndex, and returns the index of the first item that matches the
condition specified in the closure.
Example (aggregate is ChronoUnit
enum values):
import java.time.temporal.ChronoUnit def nameStartsWithM = { it.name().startsWith('M') } def first = ChronoUnit.findIndexOf(nameStartsWithM) def second = ChronoUnit.findIndexOf(first + 1, nameStartsWithM) def third = ChronoUnit.findIndexOf(second + 1, nameStartsWithM) Set units = [first, second, third] assert !units.contains(-1) // should have found 3 of MICROS, MILLIS, MINUTES, MONTHS, ... assert units.size() == 3 // just check size so as not to rely on order
self
- the iteration object over which to iteratestartIndex
- start matching from this indexcondition
- the matching conditionIterates over the elements of an Iterator and returns the index of the first item that satisfies the condition specified by the closure.
self
- an Iteratorcondition
- the matching conditionIterates over the elements of an Iterator, starting from a specified startIndex, and returns the index of the first item that satisfies the condition specified by the closure.
self
- an IteratorstartIndex
- start matching from this indexcondition
- the matching conditionIterates over the elements of an Iterable and returns the index of the first item that satisfies the condition specified by the closure.
self
- an Iterablecondition
- the matching conditionIterates over the elements of an Iterable, starting from a specified startIndex, and returns the index of the first item that satisfies the condition specified by the closure.
self
- an IterablestartIndex
- start matching from this indexcondition
- the matching conditionIterates over the elements of an aggregate of items and returns the index values of the items that match the condition specified in the closure.
self
- the iteration object over which to iteratecondition
- the matching conditionIterates over the elements of an aggregate of items, starting from a specified startIndex, and returns the index values of the items that match the condition specified in the closure.
self
- the iteration object over which to iteratestartIndex
- start matching from this indexcondition
- the matching conditionIterates over the elements of an Iterator and returns the index values of the items that match the condition specified in the closure.
self
- an Iteratorcondition
- the matching conditionIterates over the elements of an Iterator, starting from a specified startIndex, and returns the index values of the items that match the condition specified in the closure.
self
- an IteratorstartIndex
- start matching from this indexcondition
- the matching conditionIterates over the elements of an Iterable and returns the index values of the items that match the condition specified in the closure.
self
- an Iterablecondition
- the matching conditionIterates over the elements of an Iterable, starting from a specified startIndex, and returns the index values of the items that match the condition specified in the closure.
self
- an IterablestartIndex
- start matching from this indexcondition
- the matching condition Iterates over the elements of an aggregate of items and returns
the index of the last item that matches the condition specified in the closure.
Example (aggregate is ChronoUnit
enum values):
import java.time.temporal.ChronoUnit def nameStartsWithM = { it.name().startsWith('M') } def first = ChronoUnit.findIndexOf(nameStartsWithM) def last = ChronoUnit.findLastIndexOf(nameStartsWithM) // should have found 2 unique index values for MICROS, MILLIS, MINUTES, MONTHS, ... assert first != -1 && last != -1 && first != last
self
- the iteration object over which to iteratecondition
- the matching conditionIterates over the elements of an aggregate of items, starting from a specified startIndex, and returns the index of the last item that matches the condition specified in the closure.
self
- the iteration object over which to iteratestartIndex
- start matching from this indexcondition
- the matching conditionIterates over the elements of an Iterator and returns the index of the last item that matches the condition specified in the closure.
self
- an Iteratorcondition
- the matching conditionIterates over the elements of an Iterator, starting from a specified startIndex, and returns the index of the last item that matches the condition specified in the closure.
self
- an IteratorstartIndex
- start matching from this indexcondition
- the matching conditionIterates over the elements of an Iterable and returns the index of the last item that matches the condition specified in the closure.
self
- an Iterablecondition
- the matching conditionIterates over the elements of an Iterable, starting from a specified startIndex, and returns the index of the last item that matches the condition specified in the closure.
self
- an IterablestartIndex
- start matching from this indexcondition
- the matching conditionTreats the object as iterable, iterating through the values it represents and returns the first non-null result obtained from calling the closure, otherwise returns null.
int[] numbers = [1, 2, 3] assert numbers.findResult { if(it>
1) return it } == 2 assert numbers.findResult { if(it>
4) return it } == null
self
- an Object with an iterator returning its valuescondition
- a closure that returns a non-null value to indicate that processing should stop and the value should be returnedTreats the object as iterable, iterating through the values it represents and returns the first non-null value, otherwise returns null.
class Foo { List items Iterator iterator() { items.iterator() } } assert new Foo(items: [null, 2, 4]).findResult() == 2 assert new Foo(items: [null, null]).findResult() == null
self
- an Object with an iterator returning its valuesTreats the object as iterable, iterating through the values it represents and returns the first non-null result obtained from calling the closure, otherwise returns the defaultResult.
int[] numbers = [1, 2, 3] assert numbers.findResult(5) { if(it>
1) return it } == 2 assert numbers.findResult(5) { if(it>
4) return it } == 5
self
- an Object with an iterator returning its valuesdefaultResult
- an Object that should be returned if all closure results are nullcondition
- a closure that returns a non-null value to indicate that processing should stop and the value should be returnedTreats the object as iterable, iterating through the values it represents and returns the first non-null result, otherwise returns the defaultResult.
class Foo { List items Iterator iterator() { items.iterator() } } assert new Foo(items: [null, 2, 4]).findResult(5) == 2 assert new Foo(items: [null, null]).findResult(5) == 5
self
- an Object with an iterator returning its valuesdefaultResult
- an Object that should be returned if all elements are nullIterates through the Iterator calling the given closure condition for each item but stopping once the first non-null result is found and returning that result. If all are null, the defaultResult is returned.
Examples:
def iter = [1,2,3].iterator() assert "Found 2" == iter.findResult("default") { it>
1 ? "Found $it" : null } assert "default" == iter.findResult("default") { it>
3 ? "Found $it" : null }
self
- an IteratordefaultResult
- an Object that should be returned if all closure results are nullcondition
- a closure that returns a non-null value to indicate that processing should stop and the value should be returnedIterates through the Iterator stopping once the first non-null result is found and returning that result. If all are null, the defaultResult is returned.
Examples:
assert [null, 1, 2].iterator().findResult('default') == 1 assert [null, null].findResult('default') == 'default'
self
- an IteratordefaultResult
- an Object that should be returned if all elements are nullIterates through the Iterator calling the given closure condition for each item but stopping once the first non-null result is found and returning that result. If all results are null, null is returned.
self
- an Iteratorcondition
- a closure that returns a non-null value to indicate that processing should stop and the value should be returnedIterates through the Iterator stopping once the first non-null result is found and returning that result. If all results are null, null is returned.
self
- an IteratorIterates through the Iterable calling the given closure condition for each item but stopping once the first non-null result is found and returning that result. If all are null, the defaultResult is returned.
Examples:
def list = [1,2,3] assert "Found 2" == list.findResult("default") { it>
1 ? "Found $it" : null } assert "default" == list.findResult("default") { it>
3 ? "Found $it" : null }
self
- an IterabledefaultResult
- an Object that should be returned if all closure results are nullcondition
- a closure that returns a non-null value to indicate that processing should stop and the value should be returnedIterates through the Iterable calling the given closure condition for each item but stopping once the first non-null result is found and returning that result. If all are null, the defaultResult is returned.
Examples:
assert [null, 1, 2].findResult('default') == 1 assert [null, null].findResult('default') == 'default'
self
- an IterabledefaultResult
- an Object that should be returned if all elements in the iterable are nullIterates through the Iterable calling the given closure condition for each item but stopping once the first non-null result is found and returning that result. If all results are null, null is returned.
self
- an Iterablecondition
- a closure that returns a non-null value to indicate that processing should stop and the value should be returnedIterates through the Iterable stopping once the first non-null result is found and returning that result. If all results are null, null is returned.
self
- an IterableReturns the first non-null closure result found by passing each map entry to the closure, otherwise null is returned. If the closure takes two parameters, the entry key and value are passed. If the closure takes one parameter, the Map.Entry object is passed.
assert "Found b:3" == [a:1, b:3].findResult { if (it.value == 3) return "Found ${it.key}:${it.value}" }
assert null == [a:1, b:3].findResult { if (it.value == 9) return "Found ${it.key}:${it.value}" }
assert "Found a:1" == [a:1, b:3].findResult { k, v ->
if (k.size() + v == 2) return "Found $k:$v" }
self
- a Mapcondition
- a 1 or 2 arg Closure that returns a non-null value when processing should stop and a value should be returnedReturns the first non-null closure result found by passing each map entry to the closure, otherwise the defaultResult is returned. If the closure takes two parameters, the entry key and value are passed. If the closure takes one parameter, the Map.Entry object is passed.
assert "Found b:3" == [a:1, b:3].findResult("default") { if (it.value == 3) return "Found ${it.key}:${it.value}" }
assert "default" == [a:1, b:3].findResult("default") { if (it.value == 9) return "Found ${it.key}:${it.value}" }
assert "Found a:1" == [a:1, b:3].findResult("default") { k, v ->
if (k.size() + v == 2) return "Found $k:$v" }
self
- a MapdefaultResult
- an Object that should be returned if all closure results are nullcondition
- a 1 or 2 arg Closure that returns a non-null value when processing should stop and a value should be returnedIterates through the Iterable transforming items using the supplied closure and collecting any non-null results.
Example:
def list = [1,2,3]
def result = list.findResults { it >
1 ? "Found $it" : null }
assert result == ["Found 2", "Found 3"]
self
- an IterablefilteringTransform
- a Closure that should return either a non-null transformed value or null for items which should be discardedIterates through the Iterable collecting any non-null results.
Example:
assert [1, null, 2, null, 3].findResults() == [1, 2, 3]
self
- an IterableIterates through the Iterator transforming items using the supplied closure and collecting any non-null results.
self
- an IteratorfilteringTransform
- a Closure that should return either a non-null transformed value or null for items which should be discardedIterates through the Iterator collecting any non-null results.
self
- an IteratorIterates through the map transforming items using the supplied closure and collecting any non-null results. If the closure takes two parameters, the entry key and value are passed. If the closure takes one parameter, the Map.Entry object is passed.
Example:
def map = [a:1, b:2, hi:2, cat:3, dog:2]
def result = map.findResults { k, v ->
k.size() == v ? "Found $k:$v" : null }
assert result == ["Found a:1", "Found hi:2", "Found cat:3"]
self
- a MapfilteringTransform
- a 1 or 2 arg Closure that should return either a non-null transformed value or null for items which should be discardedReturns the first item from the List.
def list = [3, 4, 2] assert list.first() == 3 // check original is unaltered assert list == [3, 4, 2]
self
- a ListReturns the first item from the Iterable.
def set = [3, 4, 2] as LinkedHashSet assert set.first() == 3 // check original is unaltered assert set == [3, 4, 2] as SetThe first element returned by the Iterable's iterator is returned. If the Iterable doesn't guarantee a defined order it may appear like a random element is returned.
self
- an IterableFlatten a Collection. This Collection and any nested arrays or collections have their contents (recursively) added to the new collection.
assert [1,2,3,4,5] == [1,[2,3],[[4]],[],5].flatten()
self
- a Collection to flattenFlatten an Iterable. This Iterable and any nested arrays or collections have their contents (recursively) added to the new collection.
assert [1,2,3,4,5] == [1,[2,3],[[4]],[],5].flatten()
self
- an Iterable to flattenFlatten an Iterable. This Iterable and any nested arrays or collections have their contents (recursively) added to the new collection. If flattenOptionals is true, the non-empty optionals are also flattened.
var items = [1..2, [3, [4]], Optional.of(5), Optional.empty()] assert items.flatten() == [1, 2, 3, 4, 5] // boolean param determines whether to flatten optionals (false for legacy behavior) assert items.flatten(true) == [1, 2, 3, 4, 5] assert items.flatten(false) == [1, 2, 3, 4, Optional.of(5), Optional.empty()]
self
- an Iterable to flattenflattenOptionals
- whether to treat an Optional as a container to flattenFlatten a List. This List and any nested arrays or collections have their contents (recursively) added to the new List.
assert [1,2,3,4,5] == [1,[2,3],[[4]],[],5].flatten()
self
- a List to flattenFlatten a Set. This Set and any nested arrays or collections have their contents (recursively) added to the new Set.
assert [1,2,3,4,5] as Set == ([1,[2,3],[[4]],[],5] as Set).flatten()
self
- a Set to flattenFlatten a SortedSet. This SortedSet and any nested arrays or collections have their contents (recursively) added to the new SortedSet.
Set nested = [[0,1],[2],3,[4],5] SortedSet sorted = new TreeSet({ a, b->
(a instanceof List ? a[0] : a)<=>
(b instanceof List ? b[0] : b) } as Comparator) sorted.addAll(nested) assert [0,1,2,3,4,5] as SortedSet == sorted.flatten()
self
- a SortedSet to flattenFlatten an Iterable. This Iterable and any nested arrays, collections, or optionals have their contents (recursively) added to a new collection. Non-Array, non-Collection, non-Optional objects are leaf nodes. The flattenUsing transform can be used to modify leaf nodes. If a leaf node represents some other kind of collective type, the supplied closure should yield the contained items; otherwise, the closure should just return the (optionally modified) leaf.
// some examples just transforming the leaf var items = [1..2, [3, [4]]] assert items.flatten(n -> n + 5) == 6..9 assert items.flatten{ 'x' * it } == ['x', 'xx', 'xxx', 'xxxx'] // Here our String is a "container" of day, month, year parts var dates = ['01/02/99', '12/12/23'] assert dates.flatten{ it.split('/') } == [['01', '02', '99'], ['12', '12', '23']] assert dates.flatten{ it.split('/').toList() } == ['01', '02', '99', '12', '12', '23'] // some examples with Maps assert [a:1, b:2].entrySet().flatten{ "$it.key$it.value" } == ['a1', 'b2'] as Set assert [[a:1], [b:2]].flatten{ it.keySet() + it.values() } == ['a', 1, 'b', 2]
self
- an IterableflattenUsing
- a closure to determine how to flatten non-Array, non-Collection elementsFlatten an Iterable. This Iterable and any nested arrays, collections, and potentially Optional elements have their contents (recursively) added to a new collection. Non-container elements are leaf elements. If flattenOptionals is false, Optionals are treated as leaf elements, otherwise they are considered as containers to flatten. The flattenUsing transform can be used to modify leaf nodes. If a leaf node represents some other kind of collective type, the supplied closure should yield the contained item or items; otherwise, the closure should just return the (optionally modified) leaf.
var items = ['a'..'b', ['c'], Optional.of('d'), Optional.empty()] var unknown = { it instanceof Optional ? it.orElse('Unknown') : it.toUpperCase() } // by default Optionals are flattened so the ternary in the // 'unknown' closure will never see the optional assert items.flatten(unknown) == ['A', 'B', 'C', 'D'] assert items.flatten(true, unknown) == ['A', 'B', 'C', 'D'] // disable optional flattening and you can provide custom flattening assert items.flatten(false, unknown) == ['A', 'B', 'C', 'd', 'Unknown']
self
- an IterableflattenOptionals
- whether to treat an Optional as a container to flatten or a leafflattenUsing
- a closure to determine how to flatten leaf elementsFlatten an Optional. This yields a collection containing the Optional value if the Optional is present, or an empty collect otherwise.
assert Optional.of(1).flatten() == [1] assert Optional.empty().flatten() == []
self
- an OptionalFlatten an Iterable. This Iterable and any nested arrays, collections or optionals have their contents (recursively) added to a new collection. A transform is applied to any leaf nodes before further flattening.
var items = ["1", "2", "foo", "3", "bar"] var toInt = s -> s.number ? Optional.of(s.toInteger()) : Optional.empty() assert items.flattenMany(toInt) == [1, 2, 3] assert items.flattenMany(String::toList) == ['1', '2', 'f', 'o', 'o', '3', 'b', 'a', 'r'] assert items.flattenMany{ it.split(/[aeiou]/) } == ['1', '2', 'f', '3', 'b', 'r'] assert ['01/02/99', '12/12/23'].flattenMany{ it.split('/') } == ['01', '02', '99', '12', '12', '23']The
flattenMany
method is somewhat similar to the collectMany
method.
While collectMany
works on the basis that the transform closure returns a
collection, flattenMany
can return a collection, array, optional or modified element.
You should use flattenMany
if you need the extra functionality it offers.
Consider using collectMany
if you return only collections in the transform, since
you will have better type inference in static typing scenarios.
self
- an Iterabletransform
- a transform applied to any leaf elementsLooks up an item in a Map for the given key and returns the corresponding value. If there is no entry for the given key return instead the default value and also add the key and default value to the map.
def map=[:] map.get("a", []) << 5 assert map == [a:[5]]For a method which doesn't mutate the map, consider instead using Map.getOrDefault or consider using Groovy's MapWithDefault often instantiated using withDefault(Map, Closure) or with more options withDefault(Map, boolean, boolean, Closure).
map
- a Mapkey
- the key to look up the valuedefaultValue
- the value to return and add to the map for this key if
there is no entry for the given key Allows the subscript operator to be used to lookup dynamic property values.
bean[somePropertyNameExpression]
. The normal property notation
of groovy is neater and more concise but only works with compile-time known
property names.
self
- the object to act uponproperty
- the property name of interestSupport the range subscript operator for a List.
def list = [1, "a", 4.5, true] assert list[1..2] == ["a", 4.5]
self
- a Listrange
- a Range indicating the items to getSelect a List of items from an eager or lazy List using a Collection to identify the indices to be selected.
def list = [].withDefault { 42 } assert list[1,0,2] == [42, 42, 42]
self
- a ListWithDefaultindices
- a Collection of indicesSupport the range subscript operator for an eager or lazy List.
def list = [].withDefault { 42 } assert list[1..2] == [null, 42]
self
- a ListWithDefaultrange
- a Range indicating the items to getSupport the range subscript operator for an eager or lazy List.
def list = [true, 1, 3.4].withDefault{ 42 }
assert list[0..<0] == []
self
- a ListWithDefaultrange
- a Range indicating the items to getSupport the range subscript operator for a List.
def list = [true, 1, 3.4]
assert list[0..<0] == []
self
- a Listrange
- a Range indicating the items to getSelect a List of items from a List using a Collection to identify the indices to be selected.
def list = [true, 1, 3.4, false] assert list[1,0,2] == [1, true, 3.4]
self
- a Listindices
- a Collection of indicesSupport the subscript operator for a List.
def list = [2, "a", 5.3] assert list[1] == "a"
self
- a Listidx
- an indexSupport the subscript operator for an Iterator. The iterator will be partially exhausted up until the idx entry after returning if a +ve or 0 idx is used, or fully exhausted if a -ve idx is used or no corresponding entry was found. Typical usage:
def iter = [2, "a", 5.3].iterator() assert iter[1] == "a"A more elaborate example:
def items = [2, "a", 5.3] def iter = items.iterator() assert iter[-1] == 5.3 // iter exhausted, so reset iter = items.iterator() assert iter[1] == "a" // iter partially exhausted so now idx starts after "a" assert iter[0] == 5.3
self
- an Iteratoridx
- an index value (-self.size() <= idx < self.size())Support the subscript operator for an Iterable. Typical usage:
// custom Iterable example: class MyIterable implements Iterable { Iterator iterator() { [1, 2, 3].iterator() } } def myIterable = new MyIterable() assert myIterable[1] == 2 // Set example: def set = [1,2,3] as LinkedHashSet assert set[1] == 2
self
- an Iterableidx
- an index value (-self.size() <= idx < self.size()) but using -ve index values will be inefficientSupport the subscript operator for a Map.
def map = [1:10] assert map[1] == 10
self
- a Mapkey
- an Object as a key for the mapSupport the subscript operator for a Bitset
self
- a BitSetindex
- index to retrieveSupport retrieving a subset of a BitSet using a Range
self
- a BitSetrange
- a Range defining the desired subsetSupport the subscript operator for Collection.
assert [String, Long, Integer] == ["a",5L,2]["class"]
coll
- a Collectionproperty
- a StringGets runtime groovydoc.
Returns indices of the collection.
Example:
assert 0..2 == [5, 6, 7].indices
self
- a collectionGets the url of the jar file/source file containing the specified class.
self
- the classnull
if the specified class is from JDK Adds a "metaClass" property to all class objects so you can use the syntax
String.metaClass.myMethod = { println "foo" }
c
- The java.lang.Class instanceObtains a MetaClass for an object either from the registry or in the case of a GroovyObject from the object itself.
obj
- The object in questionObtains a MetaClass for an object either from the registry or in the case of a GroovyObject from the object itself.
obj
- The object in questionRetrieves the list of MetaProperty objects for 'self' and wraps it in a list of PropertyValue objects that additionally provide the value for each property of 'self'.
self
- the receiver objectConvenience method that calls getMetaPropertyValues(java.lang.Object)(self) and provides the data in form of simple key/value pairs, i.e. without type() information.
self
- the receiver object Iterates through the classloader parents until it finds a loader with a class
named "org.codehaus.groovy.tools.RootLoader". If there is no such class
null
will be returned. The name is used for comparison because
a direct comparison using == may fail as the class may be loaded through
different classloaders.
self
- a ClassLoader Iterates over the collection of items which this Object represents and returns each item that matches
the given filter - calling the isCase(java.lang.Object, java.lang.Object)
method used by switch statements. This method can be used with different
kinds of filters like regular expressions, classes, ranges etc.
Example:
def list = ['a', 'b', 'aa', 'bc', 3, 4.5] assert list.grep( ~/a+/ ) == ['a', 'aa'] assert list.grep( ~/../ ) == ['aa', 'bc'] assert list.grep( Number ) == [ 3, 4.5 ] assert list.grep{ it.toString().size() == 1 } == [ 'a', 'b', 3 ]
self
- the object over which we iteratefilter
- the filter to perform on the object (using the isCase(java.lang.Object, java.lang.Object) method) Iterates over the collection of items and returns each item that matches
the given filter - calling the isCase(java.lang.Object, java.lang.Object)
method used by switch statements. method can be used with different
kinds of filters like regular expressions, classes, ranges etc.
Example:
def list = ['a', 'b', 'aa', 'bc', 3, 4.5] assert list.grep( ~/a+/ ) == ['a', 'aa'] assert list.grep( ~/../ ) == ['aa', 'bc'] assert list.grep( Number ) == [ 3, 4.5 ] assert list.grep{ it.toString().size() == 1 } == [ 'a', 'b', 3 ]
self
- a collectionfilter
- the filter to perform on each element of the collection (using the isCase(java.lang.Object, java.lang.Object) method) Iterates over the collection of items and returns each item that matches
the given filter - calling the isCase(java.lang.Object, java.lang.Object)
method used by switch statements. This method can be used with different
kinds of filters like regular expressions, classes, ranges etc.
Example:
def list = ['a', 'b', 'aa', 'bc', 3, 4.5] assert list.grep( ~/a+/ ) == ['a', 'aa'] assert list.grep( ~/../ ) == ['aa', 'bc'] assert list.grep( Number ) == [ 3, 4.5 ] assert list.grep{ it.toString().size() == 1 } == [ 'a', 'b', 3 ]
self
- a Listfilter
- the filter to perform on each element of the collection (using the isCase(java.lang.Object, java.lang.Object) method) Iterates over the collection of items and returns each item that matches
the given filter - calling the isCase(java.lang.Object, java.lang.Object)
method used by switch statements. This method can be used with different
kinds of filters like regular expressions, classes, ranges etc.
Example:
def set = ['a', 'b', 'aa', 'bc', 3, 4.5] as Set assert set.grep( ~/a+/ ) == ['a', 'aa'] as Set assert set.grep( ~/../ ) == ['aa', 'bc'] as Set assert set.grep( Number ) == [ 3, 4.5 ] as Set assert set.grep{ it.toString().size() == 1 } == [ 'a', 'b', 3 ] as Set
self
- a Setfilter
- the filter to perform on each element of the collection (using the isCase(java.lang.Object, java.lang.Object) method)Iterates over the collection of items which this Object represents and returns each item that matches using the IDENTITY Closure as a filter - effectively returning all elements which satisfy Groovy truth.
Example:
def items = [1, 2, 0, false, true, '', 'foo', [], [4, 5], null] assert items.grep() == [1, 2, true, 'foo', [4, 5]]
self
- the object over which we iterateIterates over the collection returning each element that matches using the IDENTITY Closure as a filter - effectively returning all elements which satisfy Groovy truth.
Example:
def items = [1, 2, 0, false, true, '', 'foo', [], [4, 5], null] assert items.grep() == [1, 2, true, 'foo', [4, 5]]
self
- a CollectionIterates over the collection returning each element that matches using the IDENTITY Closure as a filter - effectively returning all elements which satisfy Groovy truth.
Example:
def items = [1, 2, 0, false, true, '', 'foo', [], [4, 5], null] assert items.grep() == [1, 2, true, 'foo', [4, 5]]
self
- a ListIterates over the collection returning each element that matches using the IDENTITY Closure as a filter - effectively returning all elements which satisfy Groovy truth.
Example:
def items = [1, 2, 0, false, true, '', 'foo', [], [4, 5], null] as Set assert items.grep() == [1, 2, true, 'foo', [4, 5]] as Set
self
- a SetGroups the current element according to the value
answer
- the map containing the resultselement
- the element to be placedvalue
- the value according to which the element will be placedSorts all Iterable members into groups determined by the supplied mapping closure. The closure should return the key that this item should be grouped by. The returned LinkedHashMap will have an entry for each distinct key returned from the closure, with each value being a list of items for that group.
Example usage:
assert [0:[2,4,6], 1:[1,3,5]] == [1,2,3,4,5,6].groupBy { it % 2 }
self
- a collection to groupclosure
- a closure mapping entries on keysSorts all Iterable members into (sub)groups determined by the supplied mapping closures. Each closure should return the key that this item should be grouped by. The returned LinkedHashMap will have an entry for each distinct 'key path' returned from the closures, with each value being a list of items for that 'group path'. Example usage:
def result = [1,2,3,4,5,6].groupBy({ it % 2 }, { it <
4 })
assert result == [1:[(true):[1, 3], (false):[5]], 0:[(true):[2], (false):[4, 6]]]
Another example:
def sql = groovy.sql.Sql.newInstance(/* ... */) def data = sql.rows("SELECT * FROM a_table").groupBy({ it.column1 }, { it.column2 }, { it.column3 }) if (data.val1.val2.val3) { // there exists a record where: // a_table.column1 == val1 // a_table.column2 == val2, and // a_table.column3 == val3 } else { // there is no such record }If an empty array of closures is supplied the IDENTITY Closure will be used.
self
- a collection to groupclosures
- an array of closures, each mapping entries on keysSorts all Iterable members into (sub)groups determined by the supplied mapping closures. Each closure should return the key that this item should be grouped by. The returned LinkedHashMap will have an entry for each distinct 'key path' returned from the closures, with each value being a list of items for that 'group path'. Example usage:
def result = [1,2,3,4,5,6].groupBy([{ it % 2 }, { it <
4 }])
assert result == [1:[(true):[1, 3], (false):[5]], 0:[(true):[2], (false):[4, 6]]]
Another example:
def sql = groovy.sql.Sql.newInstance(/* ... */) def data = sql.rows("SELECT * FROM a_table").groupBy([{ it.column1 }, { it.column2 }, { it.column3 }]) if (data.val1.val2.val3) { // there exists a record where: // a_table.column1 == val1 // a_table.column2 == val2, and // a_table.column3 == val3 } else { // there is no such record }If an empty list of closures is supplied the IDENTITY Closure will be used.
self
- a collection to groupclosures
- a list of closures, each mapping entries on keysGroups the members of a map into sub maps determined by the supplied mapping closure. The closure will be passed a Map.Entry or key and value (depending on the number of parameters the closure accepts) and should return the key that each item should be grouped under. The resulting map will have an entry for each 'group' key returned by the closure, with values being the map members from the original map that belong to each group. (If instead of a map, you want a list of map entries use {code}groupEntriesBy{code}.)
If the self
map is one of TreeMap, Hashtable or Properties,
the returned Map will preserve that type, otherwise a LinkedHashMap will
be returned.
def result = [a:1,b:2,c:3,d:4,e:5,f:6].groupBy { it.value % 2 } assert result == [0:[b:2, d:4, f:6], 1:[a:1, c:3, e:5]]
self
- a map to groupclosure
- a closure mapping entries on keys Groups the members of a map into sub maps determined by the supplied
mapping closures. Each closure will be passed a Map.Entry or key and
value (depending on the number of parameters the closure accepts) and
should return the key that each item should be grouped under. The
resulting map will have an entry for each 'group path' returned by all
closures, with values being the map members from the original map that
belong to each such 'group path'.
If the self
map is one of TreeMap, Hashtable, or Properties,
the returned Map will preserve that type, otherwise a LinkedHashMap will
be returned.
def result = [a:1,b:2,c:3,d:4,e:5,f:6].groupBy({ it.value % 2 }, { it.key.next() }) assert result == [1:[b:[a:1], d:[c:3], f:[e:5]], 0:[c:[b:2], e:[d:4], g:[f:6]]]If an empty array of closures is supplied the IDENTITY Closure will be used.
self
- a map to groupclosures
- an array of closures that map entries on keys Groups the members of a map into sub maps determined by the supplied
mapping closures. Each closure will be passed a Map.Entry or key and
value (depending on the number of parameters the closure accepts) and
should return the key that each item should be grouped under. The
resulting map will have an entry for each 'group path' returned by all
closures, with values being the map members from the original map that
belong to each such 'group path'.
If the self
map is one of TreeMap, Hashtable, or Properties,
the returned Map will preserve that type, otherwise a LinkedHashMap will
be returned.
def result = [a:1,b:2,c:3,d:4,e:5,f:6].groupBy([{ it.value % 2 }, { it.key.next() }]) assert result == [1:[b:[a:1], d:[c:3], f:[e:5]], 0:[c:[b:2], e:[d:4], g:[f:6]]]If an empty list of closures is supplied the IDENTITY Closure will be used.
self
- a map to groupclosures
- a list of closures that map entries on keysGroups all map entries into groups determined by the supplied mapping closure. The closure will be passed a Map.Entry or key and value (depending on the number of parameters the closure accepts) and should return the key that each item should be grouped under. The resulting map will have an entry for each 'group' key returned by the closure, with values being the list of map entries that belong to each group. (If instead of a list of map entries, you want an actual map use {code}groupBy{code}.)
def result = [a:1,b:2,c:3,d:4,e:5,f:6].groupEntriesBy { it.value % 2 } assert result[0]*.key == ["b", "d", "f"] assert result[1]*.value == [1, 3, 5]
self
- a map to groupclosure
- a 1 or 2 arg Closure mapping entries on keys
Returns true of the implementing MetaClass has a property of the given name
Note that this method will only return true for realised properties and does not take into account implementation of getProperty or propertyMissing
self
- The object to inspectname
- The name of the property of interestReturns the first item from the Iterable.
def set = [3, 4, 2] as LinkedHashSet assert set.head() == 3 // check original is unaltered assert set == [3, 4, 2] as SetThe first element returned by the Iterable's iterator is returned. If the Iterable doesn't guarantee a defined order it may appear like a random element is returned.
self
- an IterableReturns the first item from the List.
def list = [3, 4, 2] assert list.head() == 3 assert list == [3, 4, 2]
self
- a ListAllows the closure to be called for the object reference self.
self
- the object to have a closure act uponclosure
- the closure to call on the objectLogical implication of two boolean operands.
Zips an Iterable with indices in (index, value) order.
Example usage:
assert [0: "a", 1: "b"] == ["a", "b"].indexed()
assert ["0: a", "1: b"] == ["a", "b"].indexed().collect { idx, str ->
"$idx: $str" }
self
- an IterableZips an Iterable with indices in (index, value) order.
Example usage:
assert [5: "a", 6: "b"] == ["a", "b"].indexed(5)
assert ["1: a", "2: b"] == ["a", "b"].indexed(1).collect { idx, str ->
"$idx: $str" }
self
- an Iterableoffset
- an index to start fromZips an iterator with indices in (index, value) order.
Example usage:assert [[0, "a"], [1, "b"]] == ["a", "b"].iterator().indexed().collect{ tuple->
[tuple.first, tuple.second] } assert ["0: a", "1: b"] == ["a", "b"].iterator().indexed().collect { idx, str->
"$idx: $str" }.toList()
self
- an iteratorZips an iterator with indices in (index, value) order.
Example usage:
assert [[5, "a"], [6, "b"]] == ["a", "b"].iterator().indexed(5).toList()
assert ["a: 1", "b: 2"] == ["a", "b"].iterator().indexed(1).collect { idx, str ->
"$str: $idx" }.toList()
self
- an iteratoroffset
- an index to start fromReturns the items from the Iterable excluding the last item. Leaves the original Iterable unchanged.
def list = [3, 4, 2] assert list.init() == [3, 4] assert list == [3, 4, 2]
self
- an IterableReturns the items from the List excluding the last item. Leaves the original List unchanged.
def list = [3, 4, 2] assert list.init() == [3, 4] assert list == [3, 4, 2]
self
- a ListReturns the items from the SortedSet excluding the last item. Leaves the original SortedSet unchanged.
def sortedSet = [3, 4, 2] as SortedSet assert sortedSet.init() == [2, 3] as SortedSet assert sortedSet == [3, 4, 2] as SortedSet
self
- a SortedSetReturns an Iterator containing all the items from this iterator except the last one.
def iter = [3, 4, 2].listIterator() def result = iter.init() assert result.toList() == [3, 4]
self
- an IteratorCalculates the init values of this Iterable: the first value will be this list of all items from the iterable and the final one will be an empty list, with the intervening values the results of successive applications of init on the items.
assert [1, 2, 3, 4].inits() == [[1, 2, 3, 4], [1, 2, 3], [1, 2], [1], []]
self
- an IterableIterates through the given object, passing the first two elements to the closure. The result is passed back (injected) to the closure along with the third element and so on until all elements have been consumed.
self
- an objectclosure
- a closureIterates through the given object, passing the first two elements to the closure. The result is passed back (injected) to the closure along with the third element and so on until all elements have been consumed.
def items = [1, 2, 3, 4] def value = items.inject { acc, val -> acc * val } assert value == 1 * 2 * 3 * 4 items = [['a','b'], ['b','c'], ['d','b']] value = items.inject { acc, val -> acc.intersect(val) } assert value == ['b'] items = ['j', 'o', 'i', 'n'] as Set value = items.inject(String.&plus) assert value == 'join'
self
- an iterableclosure
- a closureIterates through the given object, passing in the initial value to the closure along with the first item. The result is passed back (injected) into the closure along with the second item. The new result is injected back into the closure along with the third item and so on until further iteration is not possible.
Also known as foldLeft or reduce in functional parlance.
self
- an objectinitialValue
- some initial valueclosure
- a closureIterates through the given object, passing in the initial value to the 2-arg closure along with the first item. The result is passed back (injected) into the closure along with the second item. The new result is injected back into the closure along with the third item and so on until further iteration is not possible.
Also known as foldLeft or reduce in functional parlance. Examples:
assert 1*1*2*3*4 == [1,2,3,4].inject(1) { acc, valVisual representation of the last example above:->
acc * val } assert 0+1+2+3+4 == [1,2,3,4].inject(0) { acc, val->
acc + val } assert 'The quick brown fox' == ['quick', 'brown', 'fox'].inject('The') { acc, val->
acc + ' ' + val } assert 'bat' == ['rat', 'bat', 'cat'].inject('zzz') { min, next->
next<
min ? next : min } def max = { a, b->
[a, b].max() } def animals = ['bat', 'rat', 'cat'] assert 'rat' == animals.inject('aaa', max)
initVal animals[0] v v max('aaa', 'bat')=>
'bat' animals[1] v v max('bat', 'rat')=>
'rat' animals[2] v v max('rat', 'cat')=>
'rat'
self
- an iterableinitialValue
- some initial valueclosure
- a closureIterates through the given iterator, passing in the initial value to the closure along with the first item. The result is passed back (injected) into the closure along with the second item. The new result is injected back into the closure along with the third item and so on until further iteration is not possible.
Also known as foldLeft or reduce in functional parlance.
self
- an iteratorinitialValue
- some initial valueclosure
- a closureIterates through the given map, passing in the initial value to the 2-arg Closure along with the first item (or 3-arg Closure along with the first key and value). The result is passed back (injected) into the closure along with the second item. The new result is injected back into the closure along with the third item and so on until further iteration is not possible.
Also known as foldLeft or reduce in functional parlance. Examples:
def map = [a:1, b:2, c:3]
assert map.inject([]) { list, k, v ->
list + [k] * v
} == ['a', 'b', 'b', 'c', 'c', 'c']
self
- a mapinitialValue
- some initial valueclosure
- a 2 or 3 arg ClosureInspects returns the String that matches what would be typed into a terminal to create this object.
self
- any Object->
[1, 'hello']Integer Divide a Character by a Number. The ordinal value of the Character is used in the division (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Characterright
- a NumberInteger Divide a Number by a Character. The ordinal value of the Character is used in the division (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Numberright
- a CharacterInteger Divide two Characters. The ordinal values of the Characters are used in the division (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Characterright
- another CharacterInteger Divide two Numbers.
left
- a Numberright
- another NumberCreate a Collection composed of the intersection of both collections. Any elements that exist in both collections are added to the resultant collection. For collections of custom objects; the objects should implement java.lang.Comparable
assert [4,5] == [1,2,3,4,5].intersect([4,5,6,7,8])By default, Groovy uses a NumberAwareComparator when determining if an element exists in both collections.
left
- a Collectionright
- a CollectionCreate a Collection composed of the intersection of both collections. Any elements that exist in both collections are added to the resultant collection. For collections of custom objects; the objects should implement java.lang.Comparable
assert [3,4] == [1,2,3,4].intersect([3,4,5,6], Comparator.naturalOrder())
assert [2,4] == [1,2,3,4].intersect([4,8,12,16,20], (x, y) -> x * x <=> y
)
def one = ['a', 'B', 'c', 'd'] def two = ['b', 'C', 'd', 'e'] def compareIgnoreCase = { a, b->
a.toLowerCase()<=>
b.toLowerCase() } assert one.intersect(two) == ['d'] assert two.intersect(one) == ['d'] assert one.intersect(two, compareIgnoreCase) == ['B', 'c', 'd'] assert two.intersect(one, compareIgnoreCase) == ['b', 'C', 'd']
left
- a Collectionright
- a Collectioncomparator
- a ComparatorCreate a Collection composed of the intersection of both iterables. Any elements that exist in both iterables are added to the resultant collection. For iterables of custom objects; the objects should implement java.lang.Comparable
assert [4,5] == [1,2,3,4,5].intersect([4,5,6,7,8])By default, Groovy uses a NumberAwareComparator when determining if an element exists in both collections.
left
- an Iterableright
- an IterableCreate a Collection composed of the intersection of both iterables. Any elements that exist in both iterables are added to the resultant collection. For iterables of custom objects; the objects should implement java.lang.Comparable
assert [3,4] == [1,2,3,4].intersect([3,4,5,6], Comparator.naturalOrder())
left
- an Iterableright
- an Iterablecomparator
- a ComparatorCreate a Collection composed of the intersection of both iterables. Elements from teh first iterable which also occur (according to the comparator closure) in the second iterable are added to the result. If the closure takes a single parameter, the argument passed will be each element, and the closure should return a value used for comparison (either using Comparable.compareTo or Object.equals). If the closure takes two parameters, two items from the Iterator will be passed as arguments, and the closure should return an int value (with 0 indicating the items are deemed equal).
def one = ['a', 'B', 'c', 'd'] def two = ['b', 'C', 'd', 'e'] def compareIgnoreCase = { it.toLowerCase() } assert one.intersect(two, compareIgnoreCase) == ['B', 'c', 'd'] assert two.intersect(one, compareIgnoreCase) == ['b', 'C', 'd']
left
- an Iterableright
- an Iterablecondition
- a Closure used to determine unique itemsCreate a List composed of the intersection of a List and an Iterable. Any elements that exist in both iterables are added to the resultant collection.
assert [4,5] == [1,2,3,4,5].intersect([4,5,6,7,8])By default, Groovy uses a NumberAwareComparator when determining if an element exists in both collections.
left
- a Listright
- an IterableCreate a List composed of the intersection of a List and an Iterable. Any elements that exist in both iterables are added to the resultant collection.
assert [3,4] == [1,2,3,4].intersect([3,4,5,6])
left
- a Listright
- an Iterablecomparator
- a ComparatorCreate a Set composed of the intersection of a Set and an Iterable. Any elements that exist in both iterables are added to the resultant collection.
assert [4,5] as Set == ([1,2,3,4,5] as Set).intersect([4,5,6,7,8])By default, Groovy uses a NumberAwareComparator when determining if an element exists in both collections.
left
- a Setright
- an IterableCreate a Set composed of the intersection of a Set and an Iterable. Any elements that exist in both iterables are added to the resultant collection.
assert [3,4] as Set == ([1,2,3,4] as Set).intersect([3,4,5,6], Comparator.naturalOrder())
left
- a Setright
- an Iterablecomparator
- a ComparatorCreate a SortedSet composed of the intersection of a SortedSet and an Iterable. Any elements that exist in both iterables are added to the resultant collection.
assert [4,5] as SortedSet == ([1,2,3,4,5] as SortedSet).intersect([4,5,6,7,8])By default, Groovy uses a NumberAwareComparator when determining if an element exists in both collections.
left
- a SortedSetright
- an IterableCreate a SortedSet composed of the intersection of a SortedSet and an Iterable. Any elements that exist in both iterables are added to the resultant collection.
assert [4,5] as SortedSet == ([1,2,3,4,5] as SortedSet).intersect([4,5,6,7,8])
left
- a SortedSetright
- an Iterablecomparator
- a ComparatorCreate a Map composed of the intersection of both maps. Any entries that exist in both maps are added to the resultant map.
assert [4:4,5:5] == [1:1,2:2,3:3,4:4,5:5].intersect([4:4,5:5,6:6,7:7,8:8])
assert [1: 1, 2: 2, 3: 3, 4: 4].intersect( [1: 1.0, 2: 2, 5: 5] ) == [1:1, 2:2]
left
- a mapright
- a mapProvide a dynamic method invocation method which can be overloaded in classes to implement dynamic proxies easily.
object
- any Objectmethod
- the name of the method to callarguments
- the arguments to use Identity check. Since == is overridden in Groovy with the meaning of equality
we need some fallback to check for object identity. Invoke using the
'is' method, like so: def same = this.is(that)
self
- an objectother
- an object to compare identity with Compare a BigDecimal to another.
A fluent api style alias for compareTo
.
left
- a BigDecimalright
- a BigDecimal Compare a BigDecimal to a String representing a number.
A fluent api style alias for compareTo
.
left
- a BigDecimalright
- a String representing a numberMethod for overloading the behavior of the 'case' method in switch statements. The default implementation handles arrays types but otherwise simply delegates to Object#equals, but this may be overridden for other types. In this example:
switch( a ) { case b: //some code }"some code" is called when
b.isCase( a )
returns
true
.
caseValue
- the case valueswitchValue
- the switch value Special 'Case' implementation for Class, which allows testing
whether some switch value is assignable from the given case class.
If the switch value is an object, isCase
will return true if the
switch value is assignment compatible with the class (case value),
i.e. is an instanceof
the class, for example:
def someList = [] switch (someList) { case List: assert true : 'is a list' break case Map: assert false : 'is not a Map' break default: assert false : 'should never get here' break }If the switch value is a class,
isCase
will return true if the
switch value is assignable from the given class (case value), i.e. the case class
is the same as, or a superclass, or a super-interface of the switch class, for example:
switch (ArrayList) { case List: assert true : 'is a list' break case Map: assert false : 'is not a Map' break default: assert false : 'should never get here' break }
caseValue
- the case valueswitchValue
- the switch value'Case' implementation for collections which tests if the 'switch' operand is contained in any of the 'case' values. For example:
switch( 3 ) { case [1,3,5]: assert true break default: assert false }
caseValue
- the case valueswitchValue
- the switch value'Case' implementation for iterable types which tests if the 'switch' operand is contained in any of the 'case' values. For example:
Iterable it = {[1,3,5].iterator()} switch( 3 ) { case it: assert true break default: assert false } //GROOVY-7919 assert 1 in it assert 2 !in it
caseValue
- the case valueswitchValue
- the switch value'Case' implementation for maps which tests the groovy truth value obtained using the 'switch' operand as key. For example:
switch( 'foo' ) { case [foo:true, bar:false]: assert true break default: assert false }
caseValue
- the case valueswitchValue
- the switch value Special 'case' implementation for all numbers, which delegates to the
compareTo()
method for comparing numbers of different
types.
caseValue
- the case valueswitchValue
- the switch valueDetermines if a character is a digit. Synonym for 'Character.isDigit(this)'.
self
- a Character Check whether an Iterable
has elements
def items = [1] def iterable = { [ hasNext:{ !items.isEmpty() }, next:{ items.pop() } ] as Iterator } as Iterable assert !iterable.isEmpty() iterable.iterator().next() assert iterable.isEmpty()
self
- an IterableDetermines if a character is a letter. Synonym for 'Character.isLetter(this)'.
self
- a CharacterDetermines if a character is a letter or digit. Synonym for 'Character.isLetterOrDigit(this)'.
self
- a CharacterDetermines if a Character is lowercase. Synonym for 'Character.isLowerCase(this)'.
self
- a Character
Determines if a Character is uppercase. Synonym for 'Character.isUpperCase(this)'.
self
- a CharacterDetermines if a character is a whitespace character. Synonym for 'Character.isWhitespace(this)'.
self
- a CharacterCreates an Iterator for the given Object by converting it to a Collection.
self
- an objectSupports 'duck-typing' when trying to get an Iterator for each element of a Collection, some of which may already be an Iterator.
self
- an Iterator objectAllows an Enumeration to behave like an Iterable. Note that the Iterator.remove method is unsupported since the underlying Enumeration doesn't provide a mechanism for removing items.
self
- an Enumeration objectReturns an Iterator for the given Map's entry set.
Concatenates the toString()
representation of each item from
the Iterator. The iterator will be exhausted of elements.
self
- an Iterator of objects Concatenates the toString()
representation of each item from
the Iterable.
assert [1,2,3].join() == "123"
self
- an Iterable of objects Concatenates the toString()
representation of each item from
the Iterator, with the given String as a separator between each item. The
iterator will become exhausted of elements after producing the resulting
conjoined value.
self
- an Iterator of objectsseparator
- a String separator Concatenates the toString()
representation of each item from
the Iterable, with the given String as a separator between each item.
assert [1,2,3].join(", ") == "1, 2, 3"
self
- an Iterable of objectsseparator
- a String separatorReturns the last item from the List.
def list = [3, 4, 2] assert list.last() == 2 // check original is unaltered assert list == [3, 4, 2]
self
- a ListAn optimized version of last(List).
Returns the last item from the Iterable.
def set = [3, 4, 2] as LinkedHashSet assert set.last() == 2 // check original unaltered assert set == [3, 4, 2] as SetThe last element returned by the Iterable's iterator is returned. If the Iterable doesn't guarantee a defined order it may appear like a random element is returned.
self
- an IterableOverloads the left shift operator to provide an easy way to append objects to a Collection.
def list = [1,2] list << 3 assert list == [1,2,3]
self
- a Collectionvalue
- an Object to be added to the collection.Overloads the left shift operator to provide an easy way to append objects to a List.
def list = [1,2] list << 3 assert list == [1,2,3]
self
- a Listvalue
- an Object to be added to the List.Overloads the left shift operator to provide an easy way to append objects to a Set.
def set = [1,2] as Set set << 3 assert set == [1,2,3] as Set
self
- a Setvalue
- an Object to be added to the Set.Overloads the left shift operator to provide an easy way to append objects to a SortedSet.
def set = [1,2] as SortedSet set << 3 assert set == [1,2,3] as SortedSet
self
- a SortedSetvalue
- an Object to be added to the SortedSet.Overloads the left shift operator to provide an easy way to append objects to a BlockingQueue. In case of bounded queue the method will block till space in the queue become available
def list = new java.util.concurrent.LinkedBlockingQueue () list << 3 << 2 << 1 assert list.iterator().collect{it} == [3,2,1]
self
- a Collectionvalue
- an Object to be added to the collection.Overloads the left shift operator to provide an easy way to append Map.Entry values to a Map.
self
- a Mapentry
- a Map.Entry to be added to the Map. Overloads the left shift operator to provide an easy way to put
one maps entries into another map. This allows the compact syntax
map1 << map2
; otherwise it's just a synonym for
putAll
though it returns the original map rather than
being a void
method. Example usage:
def map = [a:1, b:2] map << [c:3, d:4] assert map == [a:1, b:2, c:3, d:4]
self
- a Mapother
- another Map whose entries should be added to the original Map.Implementation of the left shift operator for integral types. Non-integral Number types throw UnsupportedOperationException.
self
- a Number objectoperand
- the shift distance by which to left shift the number Implementation of the left shift operator for BitSets,
returning a new BitSet and leaving the original unchanged.
The intValue()
is taken for the shift distance for non-integer operands.
self
- a BitSetoperand
- the shift distance by which to shift the BitSet leftAdds max() method to Iterable objects.
assert 5 == [2,3,1,5,4].max()
self
- an IterableAdds max() method to Iterator objects. The iterator will become exhausted of elements after determining the maximum value.
self
- an IteratorSelects the maximum value found in the Iterable using the given comparator.
assert "hello" == ["hello","hi","hey"].max( { a, b->
a.length()<=>
b.length() } as Comparator )
self
- an Iterablecomparator
- a ComparatorSelects the maximum value found from the Iterator using the given comparator.
self
- an Iteratorcomparator
- a ComparatorSelects the item in the iterable which when passed as a parameter to the supplied closure returns the maximum value. A null return value represents the least possible return value, so any item for which the supplied closure returns null, won't be selected (unless all items return null). If more than one item has the maximum value, an arbitrary choice is made between the items having the maximum value.
If the closure has two parameters it is used like a traditional Comparator. I.e. it should compare its two parameters for order, returning a negative integer, zero, or a positive integer when the first parameter is less than, equal to, or greater than the second respectively. Otherwise, the Closure is assumed to take a single parameter and return a Comparable (typically an Integer) which is then used for further comparison.
assert "hello" == ["hello","hi","hey"].max { it.length() }
assert "hello" == ["hello","hi","hey"].max { a, b->
a.length()<=>
b.length() }
def pets = ['dog', 'elephant', 'anaconda'] def longestName = pets.max{ it.size() } // one of 'elephant' or 'anaconda' assert longestName.size() == 8
self
- an Iterableclosure
- a 1 or 2 arg Closure used to determine the correct orderingSelects the maximum value found from the Iterator using the closure to determine the correct ordering. The iterator will become exhausted of elements after this operation.
If the closure has two parameters it is used like a traditional Comparator. I.e. it should compare its two parameters for order, returning a negative integer, zero, or a positive integer when the first parameter is less than, equal to, or greater than the second respectively. Otherwise, the Closure is assumed to take a single parameter and return a Comparable (typically an Integer) which is then used for further comparison.
self
- an Iteratorclosure
- a Closure used to determine the correct orderingSelects an entry in the map having the maximum calculated value as determined by the supplied closure. If more than one entry has the maximum value, an arbitrary choice is made between the entries having the maximum value.
If the closure has two parameters it is used like a traditional Comparator. I.e. it should compare its two parameters for order, returning a negative integer, zero, or a positive integer when the first parameter is less than, equal to, or greater than the second respectively. Otherwise, the Closure is assumed to take a single parameter and return a Comparable (typically an Integer) which is then used for further comparison. An example:
def zoo = [monkeys:6, lions:5, tigers:7] def mostCommonEntry = zoo.max{ it.value } assert mostCommonEntry.value == 7 def leastCommonEntry = zoo.max{ a, bEdge case for multiple max values:->
b.value<=>
a.value } // double negative! assert leastCommonEntry.value == 5
def zoo = [monkeys:6, lions:5, tigers:7]
def lengthOfNamePlusNumber = { e ->
e.key.size() + e.value }
def ans = zoo.max(lengthOfNamePlusNumber) // one of [monkeys:6, tigers:7]
assert lengthOfNamePlusNumber(ans) == 13
self
- a Mapclosure
- a 1 or 2 arg Closure used to determine the correct orderingSets/updates the metaclass for a given class to a closure.
self
- the class whose metaclass we wish to updateclosure
- the closure representing the new metaclassSets/updates the metaclass for a given object to a closure.
self
- the object whose metaclass we wish to updateclosure
- the closure representing the new metaclassAdds min() method to Collection objects.
assert 2 == [4,2,5].min()
self
- a CollectionAdds min() method to Iterator objects. The iterator will become exhausted of elements after determining the minimum value.
self
- an IteratorSelects the minimum value found in the Iterable using the given comparator.
assert "hi" == ["hello","hi","hey"].min( { a, b->
a.length()<=>
b.length() } as Comparator )
self
- an Iterablecomparator
- a ComparatorSelects the minimum value found from the Iterator using the given comparator.
self
- an Iteratorcomparator
- a ComparatorSelects the item in the iterable which when passed as a parameter to the supplied closure returns the minimum value. A null return value represents the least possible return value. If more than one item has the minimum value, an arbitrary choice is made between the items having the minimum value.
If the closure has two parameters it is used like a traditional Comparator. I.e. it should compare its two parameters for order, returning a negative integer, zero, or a positive integer when the first parameter is less than, equal to, or greater than the second respectively. Otherwise, the Closure is assumed to take a single parameter and return a Comparable (typically an Integer) which is then used for further comparison.
assert "hi" == ["hello","hi","hey"].min { it.length() }
def lastDigit = { a, b->
a % 10<=>
b % 10 } assert [19, 55, 91].min(lastDigit) == 91
def pets = ['dog', 'cat', 'anaconda'] def shortestName = pets.min{ it.size() } // one of 'dog' or 'cat' assert shortestName.size() == 3
self
- an Iterableclosure
- a 1 or 2 arg Closure used to determine the correct orderingSelects the minimum value found from the Iterator using the closure to determine the correct ordering. The iterator will become exhausted of elements after this operation.
If the closure has two parameters it is used like a traditional Comparator. I.e. it should compare its two parameters for order, returning a negative integer, zero, or a positive integer when the first parameter is less than, equal to, or greater than the second respectively. Otherwise, the Closure is assumed to take a single parameter and return a Comparable (typically an Integer) which is then used for further comparison.
self
- an Iteratorclosure
- a Closure used to determine the correct orderingSelects an entry in the map having the minimum calculated value as determined by the supplied closure. If more than one entry has the minimum value, an arbitrary choice is made between the entries having the minimum value.
If the closure has two parameters it is used like a traditional Comparator. I.e. it should compare its two parameters for order, returning a negative integer, zero, or a positive integer when the first parameter is less than, equal to, or greater than the second respectively. Otherwise, the Closure is assumed to take a single parameter and return a Comparable (typically an Integer) which is then used for further comparison.
def zoo = [monkeys:6, lions:5, tigers:7] def leastCommonEntry = zoo.min{ it.value } assert leastCommonEntry.value == 5 def mostCommonEntry = zoo.min{ a, bEdge case for multiple min values:->
b.value<=>
a.value } // double negative! assert mostCommonEntry.value == 7
def zoo = [monkeys:6, lions:5, tigers:7]
def lastCharOfName = { e ->
e.key[-1] }
def ans = zoo.min(lastCharOfName) // some random entry
assert lastCharOfName(ans) == 's'
self
- a Mapclosure
- a 1 or 2 arg Closure used to determine the correct orderingCreate a Set composed of the elements of the first Set minus the elements of the given Collection.
self
- a Set objectremoveMe
- the items to remove from the SetCreate a Set composed of the elements of the first Set minus the elements from the given Iterable.
self
- a Set objectremoveMe
- the items to remove from the SetCreate a Set composed of the elements of the first Set minus the given element.
self
- a Set objectremoveMe
- the element to remove from the SetCreate a SortedSet composed of the elements of the first SortedSet minus the elements of the given Collection.
self
- a SortedSet objectremoveMe
- the items to remove from the SortedSetCreate a SortedSet composed of the elements of the first SortedSet minus the elements of the given Iterable.
self
- a SortedSet objectremoveMe
- the items to remove from the SortedSetCreate a SortedSet composed of the elements of the first SortedSet minus the given element.
self
- a SortedSet objectremoveMe
- the element to remove from the SortedSetCreate a List composed of the elements of the first list minus every occurrence of elements of the given Collection.
assert [1, "a", true, true, false, 5.3] - [true, 5.3] == [1, "a", false]
self
- a ListremoveMe
- a Collection of elements to removeCreate a new Collection composed of the elements of the first Collection minus every occurrence of elements of the given Collection.
assert [1, "a", true, true, false, 5.3] - [true, 5.3] == [1, "a", false]
self
- a CollectionremoveMe
- a Collection of elements to removeCreate a new List composed of the elements of the first List minus every occurrence of elements of the given Iterable.
assert [1, "a", true, true, false, 5.3] - [true, 5.3] == [1, "a", false]
self
- a ListremoveMe
- an Iterable of elements to removeCreate a new Collection composed of the elements of the first Iterable minus every occurrence of elements of the given Iterable.
assert [1, "a", true, true, false, 5.3] - [true, 5.3] == [1, "a", false]
self
- an IterableremoveMe
- an Iterable of elements to removeCreate a new Collection composed of the elements of the first Iterable minus every matching occurrence as determined by the condition closure of elements of the given Iterable.
assert ['a', 'B', 'c', 'D', 'E'].minus(['b', 'C', 'D']) { it.toLowerCase() } == ['a', 'E']
self
- an IterableremoveMe
- an Iterable of elements to removecondition
- a Closure used to determine unique itemsCreate a new Collection composed of the elements of the first Iterable minus every matching occurrence as determined by the condition comparator of elements of the given Iterable.
assert ['a', 'B', 'c', 'D', 'E'].minus(['b', 'C', 'D'], (i, j) -> i.toLowerCase() <=> j.toLowerCase()
) == ['a', 'E']
self
- an IterableremoveMe
- an Iterable of elements to removecomparator
- a ComparatorCreate a new List composed of the elements of the first List minus every occurrence of the given element to remove.
assert ["a", 5, 5, true] - 5 == ["a", true]
self
- a List objectremoveMe
- an element to remove from the ListCreate a new Collection composed of the elements of the first Iterable minus every occurrence of the given element to remove.
assert ["a", 5, 5, true] - 5 == ["a", true]
self
- an Iterable objectremoveMe
- an element to remove from the IterableCreate a Map composed of the entries of the first map minus the entries of the given map.
self
- a map objectremoveMe
- the entries to remove from the mapSubtract a Number from a Character. The ordinal value of the Character is used in the subtraction (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Characterright
- a NumberSubtract a Character from a Number. The ordinal value of the Character is used in the subtraction (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Numberright
- a CharacterSubtract one Character from another. The ordinal values of the Characters is used in the comparison (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Characterright
- a CharacterExtend object with category methods. All methods for given class and all super classes will be added to the object.
self
- any ClasscategoryClasses
- a category classes to useExtend class globally with category methods. All methods for given class and all super classes will be added to the class.
self
- any ClasscategoryClasses
- a category classes to useExtend class globally with category methods.
self
- any ClasscategoryClass
- a category class to useExtend class globally with category methods.
self
- any ClasscategoryClass
- a category class to useExtend class globally with category methods.
self
- any ClasscategoryClass
- a category class to useExtend class globally with category methods.
self
- any ClasscategoryClass
- a category class to usePerforms a division modulus operation.
left
- a Numberright
- another Number to modCreate a Collection composed of the elements of this Iterable, repeated a certain number of times. Note that for non-primitive elements, multiple references to the same instance will be added.
assert [1,2,3,1,2,3] == [1,2,3] * 2Note: if the Iterable happens to not support duplicates, e.g. a Set, then the method will effectively return a Collection with a single copy of the Iterable's items.
self
- an Iterablefactor
- the number of times to appendCreate a List composed of the elements of this Iterable, repeated a certain number of times. Note that for non-primitive elements, multiple references to the same instance will be added.
assert [1,2,3,1,2,3] == [1,2,3] * 2Note: if the Iterable happens to not support duplicates, e.g. a Set, then the method will effectively return a Collection with a single copy of the Iterable's items.
self
- a Listfactor
- the number of times to appendMultiply a Character by a Number. The ordinal value of the Character is used in the multiplication (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Characterright
- a NumberMultiply a Number by a Character. The ordinal value of the Character is used in the multiplication (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Numberright
- a CharacterMultiply two Characters. The ordinal values of the Characters are used in the multiplication (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Characterright
- another CharacterMultiply a BigDecimal and a Double. Note: This method was added to enforce the Groovy rule of BigDecimal*Double == Double. Without this method, the multiply(BigDecimal) method in BigDecimal would respond and return a BigDecimal instead. Since BigDecimal is preferred over Number, the Number*Number method is not chosen as in older versions of Groovy.
left
- a BigDecimalright
- a DoubleMultiply a BigDecimal and a BigInteger. Note: This method was added to enforce the Groovy rule of BigDecimal*long == long. Without this method, the multiply(BigDecimal) method in BigDecimal would respond and return a BigDecimal instead. Since BigDecimal is preferred over Number, the Number*Number method is not chosen as in older versions of Groovy. BigInteger is the fallback for all integer types in Groovy
left
- a BigDecimalright
- a BigIntegerConvenience method to dynamically create a new instance of this class. Calls the default constructor.
c
- a class Helper to construct a new instance from the given arguments.
The constructor is called based on the number and types in the
args array. Use newInstance(null)
or simply
newInstance()
for the default (no-arg) constructor.
c
- a classargs
- the constructor argumentsIncrement a Character by one.
self
- a CharacterIncrement a Number by one.
self
- a NumberProvides a method that compares two comparables using Groovy's default number aware comparator.
self
- a Comparableother
- another ComparableBitwise OR together two numbers.
left
- a Numberright
- another Number to bitwise ORBitwise OR together two BitSets. Called when the '|' operator is used between two bit sets.
left
- a BitSetright
- another BitSet to bitwise ORLogical disjunction of two boolean operators
left
- left operatorright
- right operatorCreate a Set as a union of a Set and an Iterable. Any elements that exist in either are added to the resultant Set.
This operation will always create a new object for the result, while the operands remain unchanged.
def a = [1,2,3,4] as Set def b = [3,4,5,6] as Set assert (a | b) == [1,2,3,4,5,6] as Set
left
- the left Setright
- the right IterableCreate a SortedSet as a union of a SortedSet and an Iterable. Any elements that exist in either are added to the resultant SortedSet.
This operation will always create a new object for the result, while the operands remain unchanged.
def a = [1,2,3,4] as SortedSet def b = [3,4,5,6] as Set assert (a | b) == [1,2,3,4,5,6] as SortedSet
left
- the left SortedSetright
- the right IterableFinds all permutations of an iterable.
Example usage:
def result = [1, 2, 3].permutations() assert result == [[3, 2, 1], [3, 1, 2], [1, 3, 2], [2, 3, 1], [2, 1, 3], [1, 2, 3]] as Set
self
- the Iterable of itemsFinds all permutations of an iterable, applies a function to each permutation and collects the result into a list.
Example usage:
Set result = [1, 2, 3].permutations { it.collect { v ->
2*v }}
assert result == [[6, 4, 2], [6, 2, 4], [2, 6, 4], [4, 6, 2], [4, 2, 6], [2, 4, 6]] as Set
self
- the Iterable of itemsfunction
- the function to apply on each permutationCreate a Collection as a union of two collections. If the left collection is a Set, then the returned collection will be a Set otherwise a List. This operation will always create a new object for the result, while the operands remain unchanged.
assert [1,2,3,4] == [1,2] + [3,4]
left
- the left Collectionright
- the right CollectionCreate a Collection as a union of two iterables. If the left iterable is a Set, then the returned collection will be a Set otherwise a List. This operation will always create a new object for the result, while the operands remain unchanged.
assert [1,2,3,4] == [1,2] + [3,4]
left
- the left Iterableright
- the right IterableCreate a Collection as a union of a Collection and an Iterable. If the left collection is a Set, then the returned collection will be a Set otherwise a List. This operation will always create a new object for the result, while the operands remain unchanged.
left
- the left Collectionright
- the right IterableCreate a List as a union of a List and an Iterable. This operation will always create a new object for the result, while the operands remain unchanged.
left
- the left Listright
- the right IterableCreate a List as a union of a List and a Collection. This operation will always create a new object for the result, while the operands remain unchanged.
left
- the left Listright
- the right CollectionCreate a Set as a union of a Set and an Iterable. This operation will always create a new object for the result, while the operands remain unchanged.
left
- the left Setright
- the right IterableCreate a Set as a union of a Set and a Collection. This operation will always create a new object for the result, while the operands remain unchanged.
left
- the left Setright
- the right CollectionCreate a SortedSet as a union of a SortedSet and an Iterable. This operation will always create a new object for the result, while the operands remain unchanged.
left
- the left SortedSetright
- the right IterableCreate a SortedSet as a union of a SortedSet and a Collection. This operation will always create a new object for the result, while the operands remain unchanged.
left
- the left SortedSetright
- the right CollectionCreates a new List by inserting all the elements in the specified array to the elements from the original List at the specified index. Shifts the element currently at that index (if any) and any subsequent elements to the right (increasing their indices). The new elements will appear in the resulting List in the order that they occur in the original array. The behavior of this operation is undefined if the list or array operands are modified while the operation is in progress. The original list and array operands remain unchanged.
def items = [1, 2, 3] def newItems = items.plus(2, 'a'..'c' as String[]) assert newItems == [1, 2, 'a', 'b', 'c', 3] assert items == [1, 2, 3]See also
addAll
for similar functionality with modify semantics, i.e. which performs
the changes on the original list itself.
self
- an original listitems
- array containing elements to be merged with elements from the original listindex
- index at which to insert the first element from the specified arrayCreates a new List by inserting all the elements in the given additions List to the elements from the original List at the specified index. Shifts the element currently at that index (if any) and any subsequent elements to the right (increasing their indices). The new elements will appear in the resulting List in the order that they occur in the original lists. The behavior of this operation is undefined if the original lists are modified while the operation is in progress. The original lists remain unchanged.
def items = [1, 2, 3] def newItems = items.plus(2, 'a'..'c') assert newItems == [1, 2, 'a', 'b', 'c', 3] assert items == [1, 2, 3]See also
addAll
for similar functionality with modify semantics, i.e. which performs
the changes on the original list itself.
self
- an original Listadditions
- a List containing elements to be merged with elements from the original Listindex
- index at which to insert the first element from the given additions ListCreates a new List by inserting all the elements in the given Iterable to the elements from this List at the specified index.
self
- an original listadditions
- an Iterable containing elements to be merged with the elements from the original Listindex
- index at which to insert the first element from the given additions IterableCreate a collection as a union of a Collection and an Object. If the collection is a Set, then the returned collection will be a Set otherwise a List. This operation will always create a new object for the result, while the operands remain unchanged.
assert [1,2,3] == [1,2] + 3
left
- a Collectionright
- an object to add/appendCreate a collection as a union of an Iterable and an Object. If the iterable is a Set, then the returned collection will be a Set otherwise a List. This operation will always create a new object for the result, while the operands remain unchanged.
assert [1,2,3] == [1,2] + 3
left
- an Iterableright
- an object to add/appendCreate a List as a union of a List and an Object. This operation will always create a new object for the result, while the operands remain unchanged.
assert [1,2,3] == [1,2] + 3
left
- a Listright
- an object to add/appendCreate a Set as a union of a Set and an Object. This operation will always create a new object for the result, while the operands remain unchanged.
assert [1,2,3] == [1,2] + 3
left
- a Setright
- an object to add/appendCreate a SortedSet as a union of a SortedSet and an Object. This operation will always create a new object for the result, while the operands remain unchanged.
assert [1,2,3] == [1,2] + 3
left
- a SortedSetright
- an object to add/append Returns a new Map
containing all entries from left
and right
,
giving precedence to right
. Any keys appearing in both Maps
will appear in the resultant map with values from the right
operand. If the left
map is one of TreeMap, LinkedHashMap, Hashtable
or Properties, the returned Map will preserve that type, otherwise a HashMap will
be returned.
Roughly equivalent to Map m = new HashMap(); m.putAll(left); m.putAll(right); return m;
but with some additional logic to preserve the left
Map type for common cases as
described above.
assert [a:10, b:20] + [a:5, c:7] == [a:5, b:20, c:7]
left
- a Mapright
- a Map Returns a new Map
containing all entries from self
and entries
,
giving precedence to entries
. Any keys appearing in both Maps
will appear in the resultant map with values from the entries
operand. If self
map is one of TreeMap, LinkedHashMap, Hashtable
or Properties, the returned Map will preserve that type, otherwise a HashMap will
be returned.
self
- a Mapentries
- a Collection of Map.Entry items to be added to the Map.Add a Character and a Number. The ordinal value of the Character is used in the addition (the ordinal value is the unicode value which for simple character sets is the ASCII value). This operation will always create a new object for the result, while the operands remain unchanged.
left
- a Characterright
- a NumberAdd a Number and a Character. The ordinal value of the Character is used in the addition (the ordinal value is the unicode value which for simple character sets is the ASCII value).
left
- a Numberright
- a CharacterAdd one Character to another. The ordinal values of the Characters are used in the addition (the ordinal value is the unicode value which for simple character sets is the ASCII value). This operation will always create a new object for the result, while the operands remain unchanged.
left
- a Characterright
- a CharacterAppends a String to the literal of the Map instance.
assert '[a:1] is a map' == [a:1] + ' is a map'
left
- a Mapright
- a StringAppends a GString to the literal of the Map instance.
assert '[a:1] is a map' == [a:1] + " is ${'a'} map"
left
- a Mapright
- a GStringRemoves the initial item from the List.
def list = ["a", false, 2] assert list.pop() == 'a' assert list == [false, 2]This is similar to pop on a Stack where the first item in the list represents the top of the stack. Note: The behavior of this method changed in Groovy 2.5 to align with Java. If you need the old behavior use 'removeLast'.
self
- a ListPower of a Number to a certain exponent. Called by the '**' operator.
self
- a Numberexponent
- a Number exponentPower of a BigDecimal to an integer certain exponent. If the exponent is positive, call the BigDecimal.pow(int) method to maintain precision. Called by the '**' operator.
self
- a BigDecimalexponent
- an Integer exponentPower of a BigInteger to an integer certain exponent. If the exponent is positive, call the BigInteger.pow(int) method to maintain precision. Called by the '**' operator.
self
- a BigIntegerexponent
- an Integer exponentPower of an integer to an integer certain exponent. If the exponent is positive, convert to a BigInteger and call BigInteger.pow(int) method to maintain precision. Called by the '**' operator.
self
- an Integerexponent
- an Integer exponentPower of a long to an integer certain exponent. If the exponent is positive, convert to a BigInteger and call BigInteger.pow(int) method to maintain precision. Called by the '**' operator.
self
- a Longexponent
- an Integer exponentPower of a BigInteger to a BigInteger certain exponent. Called by the '**' operator.
self
- a BigIntegerexponent
- a BigInteger exponentDecrement a Character by one.
self
- a CharacterDecrement a Number by one.
self
- a NumberImplements the getAt(int) method for primitive type arrays.
self
- an array objectidx
- the index of interestImplements the getAt(Range) method for primitive type arrays.
self
- an array objectrange
- the range of indices of interestImplements the getAt(Collection) method for primitive type arrays. Each value in the collection argument is assumed to be a valid array index. The value at each index is then added to a list which is returned.
self
- an array objectindices
- the indices of interestImplements the putAt(int) method for primitive type arrays.
self
- an objectidx
- the index of interestnewValue
- the new value to be put into the index of interestPrint a value formatted Groovy style to self if it is a Writer, otherwise to the standard output stream.
self
- any Objectvalue
- the value to printPrint a value formatted Groovy style to the print writer.
self
- a PrintWritervalue
- the value to printPrint a value formatted Groovy style to the print stream.
self
- a PrintStreamvalue
- the value to printPrint to a console in interactive format.
self
- any Objectout
- the PrintWriter used for printingPrint a value to the standard output stream. This method delegates to the owner to execute the method.
self
- a generated closurevalue
- the value to printPrintf to the standard output stream.
self
- any Objectformat
- a format stringvalues
- values referenced by the format specifiers in the format stringPrintf 0 or more values to the standard output stream using a format string. This method delegates to the owner to execute the method.
self
- a generated closureformat
- a format stringvalues
- values referenced by the format specifiers in the format stringPrintf a value to the standard output stream using a format string. This method delegates to the owner to execute the method.
self
- a generated closureformat
- a format stringvalue
- value referenced by the format specifier in the format stringPrints a formatted string using the specified format string and arguments.
Examples:
printf ( "Hello, %s!\n" , [ "world" ] as String[] ) printf ( "Hello, %s!\n" , [ "Groovy" ]) printf ( "%d + %d = %d\n" , [ 1 , 2 , 1+2 ] as Integer[] ) printf ( "%d + %d = %d\n" , [ 3 , 3 , 3+3 ]) ( 1..5 ).each { printf ( "-- %d\n" , [ it ] as Integer[] ) } ( 1..5 ).each { printf ( "-- %d\n" , [ it ] as int[] ) } ( 0x41..0x45 ).each { printf ( "-- %c\n" , [ it ] as char[] ) } ( 07..011 ).each { printf ( "-- %d\n" , [ it ] as byte[] ) } ( 7..11 ).each { printf ( "-- %d\n" , [ it ] as short[] ) } ( 7..11 ).each { printf ( "-- %d\n" , [ it ] as long[] ) } ( 7..11 ).each { printf ( "-- %5.2f\n" , [ it ] as float[] ) } ( 7..11 ).each { printf ( "-- %5.2g\n" , [ it ] as double[] ) }
self
- any Objectformat
- A format stringarg
- Argument which is referenced by the format specifiers in the format
string. The type of arg
should be one of Object[], List,
int[], short[], byte[], char[], boolean[], long[], float[], or double[].Print a linebreak to the standard output stream.
self
- any ObjectPrint a linebreak to the standard output stream. This method delegates to the owner to execute the method.
self
- a closurePrint a value formatted Groovy style (followed by a newline) to self if it is a Writer, otherwise to the standard output stream.
self
- any Objectvalue
- the value to printPrint a value formatted Groovy style (followed by a newline) to the print writer.
self
- a PrintWritervalue
- the value to printPrint a value formatted Groovy style (followed by a newline) to the print stream.
self
- any Objectvalue
- the value to printPrint a value (followed by a newline) to the standard output stream. This method delegates to the owner to execute the method.
self
- a closurevalue
- the value to printPrint to a console in interactive format.
self
- any Objectout
- the PrintWriter used for printingPrepends an item to the start of the List.
def list = [3, 4, 2] list.push("x") assert list == ['x', 3, 4, 2]This is similar to push on a Stack where the first item in the list represents the top of the stack. Note: The behavior of this method changed in Groovy 2.5 to align with Java. If you need the old behavior use 'add'.
self
- a Listvalue
- element to be prepended to this list.Provides an easy way to append multiple Map.Entry values to a Map.
self
- a Mapentries
- a Collection of Map.Entry items to be added to the Map. Allows the subscript operator to be used to set dynamically named property values.
bean[somePropertyNameExpression] = foo
. The normal property notation
of groovy is neater and more concise but only works with property names which
are known at compile time.
self
- the object to act uponproperty
- the name of the property to setnewValue
- the value to setA helper method to allow lists to work with subscript operators.
def list = [2, 3] list[0] = 1 assert list == [1, 3]
self
- a Listidx
- an indexvalue
- the value to put at the given indexSupport subscript operator for list modification.
A helper method to allow lists to work with subscript operators.
def list = ["a", true]
list[1..<1] = 5
assert list == ["a", 5, true]
self
- a Listrange
- the (in this case empty) subset of the list to setvalue
- the values to put at the given sublist or a Collection of valuesA helper method to allow lists to work with subscript operators.
def list = ["a", true]
list[1..<1] = [4, 3, 2]
assert list == ["a", 4, 3, 2, true]
self
- a Listrange
- the (in this case empty) subset of the list to setvalue
- the Collection of valuesList subscript assignment operator when given a range as the index and the assignment operand is a collection. Example:
def myList = [4, 3, 5, 1, 2, 8, 10] myList[3..5] = ["a", true] assert myList == [4, 3, 5, "a", true, 10]Items in the given range are replaced with items from the collection.
self
- a Listrange
- the subset of the list to setcol
- the collection of values to put at the given sublistList subscript assignment operator when given a range as the index. Example:
def myList = [4, 3, 5, 1, 2, 8, 10] myList[3..5] = "b" assert myList == [4, 3, 5, "b", 10]Items in the given range are replaced with the operand. The
value
operand is
always treated as a single value.
self
- a Listrange
- the subset of the list to setvalue
- the value to put at the given sublistA helper method to allow lists to work with subscript operators.
def list = ["a", true, 42, 9.4] list[1, 4] = ["x", false] assert list == ["a", "x", 42, 9.4, false]
self
- a Listsplice
- the subset of the list to setvalues
- the value to put at the given sublistA helper method to allow lists to work with subscript operators.
def list = ["a", true, 42, 9.4] list[1, 3] = 5 assert list == ["a", 5, 42, 5]
self
- a Listsplice
- the subset of the list to setvalue
- the value to put at the given sublistA helper method to allow maps to work with subscript operators
self
- a Mapkey
- an Object as a key for the mapvalue
- the value to put into the mapSupport assigning a range of values with a single assignment statement.
self
- a BitSetrange
- the range of values to setvalue
- valueSupport subscript-style assignment for a BitSet.
self
- a BitSetindex
- index of the entry to setvalue
- valuePerforms a division modulus operation. Called by the '%' operator.
left
- a Numberright
- another Number to find the remainder Modifies this collection by removing its elements that are contained
within the specified object array.
See also findAll
and grep
when wanting to produce a new list
containing items which don't match some criteria while leaving the original collection unchanged.
self
- a Collection to be modifieditems
- array containing elements to be removed from this collectionModifies this collection by removing the elements that are matched according to the specified closure condition.
def list = ['a', 'b'] list.removeAll { it == 'b' } assert list == ['a']See also
findAll
and grep
when wanting to produce a new list
containing items which match some criteria but leaving the original collection unchanged.
self
- a Collection to be modifiedcondition
- a closure condition Modifies this map by removing the elements that are matched according to the
specified closure condition. If the closure takes one parameter then it will be
passed the Map.Entry
. Otherwise the closure should take two parameters, which
will be the key and the value.
def map = [a:1, b:2]
map.removeAll { k,v ->
k == 'b' }
assert map == [a:1]
See also findAll
when wanting to produce a new map containing items
which match some criteria but leaving the original map unchanged.
self
- a Map to be modifiedcondition
- a 1 or 2 arg Closure condition applying on the entriesModifies this list by removing the element at the specified position in this list. Returns the removed element. Essentially an alias for List.remove but with no ambiguity for List<Integer>.
Example:def list = [1, 2, 3] list.removeAt(1) assert [1, 3] == list
self
- a Listindex
- the index of the element to be removedModifies this collection by removing a single instance of the specified element from this collection, if it is present. Essentially an alias for Collection.remove but with no ambiguity for Collection<Integer>.
Example:def list = [1, 2, 3, 2] list.removeElement(2) assert [1, 3, 2] == list
self
- a Collectiono
- element to be removed from this collection, if presentRemoves the last item from the List.
def list = ["a", false, 2] assert list.removeLast() == 2 assert list == ["a", false]Using add() and removeLast() is similar to push and pop on a Stack where the last item in the list represents the top of the stack.
self
- a List
Returns an object satisfying Groovy truth if the implementing MetaClass responds to a method with the given name and arguments types.
Note that this method's return value is based on realised methods and does not take into account objects or classes that implement invokeMethod or methodMissing
This method is "safe" in that it will always return a value and never throw an exception
self
- The object to inspectname
- The name of the method of interestargTypes
- The argument types to match against
Returns an object satisfying Groovy truth if the implementing MetaClass responds to a method with the given name regardless of the arguments.
Note that this method's return value is based on realised methods and does not take into account objects or classes that implement invokeMethod or methodMissing
This method is "safe" in that it will always return a value and never throw an exception
self
- The object to inspectname
- The name of the method of interest Modifies this collection so that it retains only its elements that are contained
in the specified array. In other words, removes from this collection all of
its elements that are not contained in the specified array.
See also grep
and findAll
when wanting to produce a new list
containing items which match some specified items but leaving the original collection unchanged.
self
- a Collection to be modifieditems
- array containing elements to be retained from this collectionModifies this collection so that it retains only its elements that are matched according to the specified closure condition. In other words, removes from this collection all of its elements that don't match.
def list = ['a', 'b'] list.retainAll { it == 'b' } assert list == ['b']See also
findAll
and grep
when wanting to produce a new list
containing items which match some criteria but leaving the original collection unchanged.
self
- a Collection to be modifiedcondition
- a closure condition Modifies this map so that it retains only its elements that are matched
according to the specified closure condition. In other words, removes from
this map all of its elements that don't match. If the closure takes one
parameter then it will be passed the Map.Entry
. Otherwise the closure should
take two parameters, which will be the key and the value.
def map = [a:1, b:2]
map.retainAll { k,v ->
k == 'b' }
assert map == [b:2]
See also findAll
when wanting to produce a new map containing items
which match some criteria but leaving the original map unchanged.
self
- a Map to be modifiedcondition
- a 1 or 2 arg Closure condition applying on the entriesCreates a new List with the identical contents to this list but in reverse order.
def list = ["a", 4, false] assert list.reverse() == [false, 4, "a"] assert list == ["a", 4, false]
self
- a ListReverses the elements in a list. If mutate is true, the original list is modified in place and returned. Otherwise, a new list containing the reversed items is produced.
def list = ["a", 4, false] assert list.reverse(false) == [false, 4, "a"] assert list == ["a", 4, false] assert list.reverse(true) == [false, 4, "a"] assert list == [false, 4, "a"]
self
- a Listmutate
- true if the list itself should be reversed in place and returned, false if a new list should be createdReverses the iterator. The original iterator will become exhausted of elements after determining the reversed values. A new iterator for iterating through the reversed values is returned.
self
- an IteratorAllows a Map to be iterated through in reverse order using a closure. In general, the order in which the map contents are processed cannot be guaranteed. In practise, specialized forms of Map, e.g. a TreeMap will have its contents processed according to the reverse of the natural ordering of the map.
self
- the map over which we iterateclosure
- the 1 or 2 arg closure applied on each entry of the mapIterate over each element of the list in the reverse order.
def result = [] [1,2,3].reverseEach { result << it } assert result == [3,2,1]
self
- a Listclosure
- a closure to which each item is passed.Iterate over each element of the set in reverse order.
TreeSet navSet = [2, 4, 1, 3] // natural order is sorted List result = [] navSet.reverseEach { result << it } assert result == [4, 3, 2, 1]
self
- a NavigableSetclosure
- a closure to which each item is passed.Implementation of the right shift operator for integral types. Non-integral Number types throw UnsupportedOperationException.
self
- a Number objectoperand
- the shift distance by which to right shift the number Implementation of the right shift operator for BitSets,
returning a new BitSet and leaving the original unchanged.
The intValue()
is taken for the shift distance for non-integer operands.
self
- a BitSetoperand
- the shift distance by which to right shift the BitSetImplementation of the right shift (unsigned) operator for integral types. Non-integral Number types throw UnsupportedOperationException.
self
- a Number objectoperand
- the shift distance by which to right shift (unsigned) the number Implementation of the right shift (unsigned) operator for BitSets,
returning a new BitSet and leaving the original unchanged.
The intValue()
is taken for the shift distance for non-integer operands.
self
- a BitSetoperand
- the shift distance by which to right shift (unsigned) the BitSetRound the value
number
- a FloatRound the value
number
- a Floatprecision
- the number of decimal places to keepRound the value
number
- a DoubleRound the value
number
- a Doubleprecision
- the number of decimal places to keepRound the value
Note that this method differs from BigDecimal.round which specifies the digits to retain starting from the leftmost nonzero digit. This method rounds the integral part to the nearest whole number.
number
- a BigDecimalRound the value
Note that this method differs from BigDecimal.round which specifies the digits to retain starting from the leftmost nonzero digit. This method operates on the fractional part of the number and the precision argument specifies the number of digits to the right of the decimal point to retain.
number
- a BigDecimalprecision
- the number of decimal places to keepAllows a simple syntax for using timers. This timer will execute the given closure after the given delay.
timer
- a timer objectdelay
- the delay in milliseconds before running the closure codeclosure
- the closure to invokeSets the metaclass for a given class.
self
- the class whose metaclass we wish to setmetaClass
- the new MetaClassSets the metaclass for an object.
self
- the object whose metaclass we want to setmetaClass
- the new metaclass value Sets the metaclass for a GroovyObject
.
self
- the object whose metaclass we want to setmetaClass
- the new metaclass valueRandomly reorders the elements of the specified list.
def list = ["a", 4, false] def origSize = list.size() def origCopy = new ArrayList(list) list.shuffle() assert list.size() == origSize assert origCopy.every{ list.contains(it) }
self
- a ListRandomly reorders the elements of the specified list using the specified random instance as the source of randomness.
def r = new Random() def list = ["a", 4, false] def origSize = list.size() def origCopy = new ArrayList(list) list.shuffle(r) assert list.size() == origSize assert origCopy.every{ list.contains(it) }
self
- a ListCreates a new list containing the elements of the specified list but in a random order.
def list = ["a", 4, false] def result = list.shuffled() assert list !== result assert list == ["a", 4, false] assert list.size() == result.size() assert list.every{ result.contains(it) }
self
- a ListCreates a new list containing the elements of the specified list but in a random order using the specified random instance as the source of randomness.
def r = new Random() def list = ["a", 4, false] def result = list.shuffled(r) assert list !== result assert list == ["a", 4, false] assert list.size() == result.size() assert list.every{ result.contains(it) }
self
- a List Provide the standard Groovy size()
method for Iterator
.
The iterator will become exhausted of elements after determining the size value.
self
- an Iterator Provide the standard Groovy size()
method for Iterable
.
def items = [1, 2, 3] def iterable = { [ hasNext:{ !items.isEmpty() }, next:{ items.pop() } ] as Iterator } as Iterable assert iterable.size() == 3
self
- an IterableSorts the Collection. Assumes that the collection items are comparable and uses their natural ordering to determine the resulting order. If the Collection is a List, it is sorted in place and returned. Otherwise, the elements are first placed into a new list which is then sorted and returned - leaving the original Collection unchanged.
assert [1,2,3] == [3,1,2].sort()
self
- the Iterable to be sortedSorts the Iterable. Assumes that the Iterable items are comparable and uses their natural ordering to determine the resulting order. If the Iterable is a List and mutate is true, it is sorted in place and returned. Otherwise, the elements are first placed into a new list which is then sorted and returned - leaving the original Iterable unchanged.
assert [1,2,3] == [3,1,2].sort()
def orig = [1, 3, 2] def sorted = orig.sort(false) assert orig == [1, 3, 2] assert sorted == [1, 2, 3]
self
- the iterable to be sortedmutate
- false will always cause a new list to be created, true will mutate lists in placeSorts the elements from the given map into a new ordered map using the closure as a comparator to determine the ordering. The original map is unchanged.
def map = [a:5, b:3, c:6, d:4].sort { a, b->
a.value<=>
b.value } assert map == [b:3, d:4, a:5, c:6]
self
- the original unsorted mapclosure
- a Closure used as a comparatorSorts the elements from the given map into a new ordered Map using the specified key comparator to determine the ordering. The original map is unchanged.
def map = [ba:3, cz:6, ab:5].sort({ a, b->
a[-1]<=>
b[-1] } as Comparator) assert map*.value == [3, 5, 6]
self
- the original unsorted mapcomparator
- a ComparatorSorts the elements from the given map into a new ordered Map using the natural ordering of the keys to determine the ordering. The original map is unchanged.
map = [ba:3, cz:6, ab:5].sort() assert map*.value == [5, 3, 6]
self
- the original unsorted mapSorts the given iterator items into a sorted iterator. The items are assumed to be comparable. The original iterator will become exhausted of elements after completing this method call. A new iterator is produced that traverses the items in sorted order.
self
- the Iterator to be sortedSorts the given iterator items into a sorted iterator using the comparator. The original iterator will become exhausted of elements after completing this method call. A new iterator is produced that traverses the items in sorted order.
self
- the Iterator to be sortedcomparator
- a Comparator used for comparing itemsSorts the Iterable using the given Comparator. If the Iterable is a List and mutate is true, it is sorted in place and returned. Otherwise, the elements are first placed into a new list which is then sorted and returned - leaving the original Iterable unchanged.
assert ["hi","hey","hello"] == ["hello","hi","hey"].sort(false, { a, b->
a.length()<=>
b.length() } as Comparator )
def orig = ["hello","hi","Hey"] def sorted = orig.sort(false, String.CASE_INSENSITIVE_ORDER) assert orig == ["hello","hi","Hey"] assert sorted == ["hello","Hey","hi"]
self
- the Iterable to be sortedmutate
- false will always cause a new list to be created, true will mutate lists in placecomparator
- a Comparator used for the comparisonSorts the given iterator items into a sorted iterator using the Closure to determine the correct ordering. The original iterator will be fully processed after the method call.
If the closure has two parameters it is used like a traditional Comparator. I.e. it should compare its two parameters for order, returning a negative integer, zero, or a positive integer when the first parameter is less than, equal to, or greater than the second respectively. Otherwise, the Closure is assumed to take a single parameter and return a Comparable (typically an Integer) which is then used for further comparison.
self
- the Iterator to be sortedclosure
- a Closure used to determine the correct orderingSorts this Iterable using the given Closure to determine the correct ordering. If the Iterable is a List, it is sorted in place and returned. Otherwise, the elements are first placed into a new list which is then sorted and returned - leaving the original Iterable unchanged.
If the Closure has two parameters it is used like a traditional Comparator. I.e. it should compare its two parameters for order, returning a negative integer, zero, or a positive integer when the first parameter is less than, equal to, or greater than the second respectively. Otherwise, the Closure is assumed to take a single parameter and return a Comparable (typically an Integer) which is then used for further comparison.
assert ["hi","hey","hello"] == ["hello","hi","hey"].sort { it.length() }
assert ["hi","hey","hello"] == ["hello","hi","hey"].sort { a, b->
a.length()<=>
b.length() }
self
- the Iterable to be sortedclosure
- a 1 or 2 arg Closure used to determine the correct orderingSorts this Iterable using the given Closure to determine the correct ordering. If the Iterable is a List and mutate is true, it is sorted in place and returned. Otherwise, the elements are first placed into a new list which is then sorted and returned - leaving the original Iterable unchanged.
If the closure has two parameters it is used like a traditional Comparator. I.e. it should compare its two parameters for order, returning a negative integer, zero, or a positive integer when the first parameter is less than, equal to, or greater than the second respectively. Otherwise, the Closure is assumed to take a single parameter and return a Comparable (typically an Integer) which is then used for further comparison.
assert ["hi","hey","hello"] == ["hello","hi","hey"].sort { it.length() }
assert ["hi","hey","hello"] == ["hello","hi","hey"].sort { a, b->
a.length()<=>
b.length() }
def orig = ["hello","hi","Hey"] def sorted = orig.sort(false) { it.toUpperCase() } assert orig == ["hello","hi","Hey"] assert sorted == ["hello","Hey","hi"]
self
- the Iterable to be sortedmutate
- false will always cause a new list to be created, true will mutate lists in placeclosure
- a 1 or 2 arg Closure used to determine the correct orderingAvoids doing unnecessary work when sorting an already sorted set (i.e. an identity function for an already sorted set).
self
- an already sorted setAvoids doing unnecessary work when sorting an already sorted map (i.e. an identity function for an already sorted map).
self
- an already sorted mapSplits all items into two lists based on the closure condition. The first list contains all items matching the closure expression. The second list all those that don't.
self
- an Object with an Iterator returning its valuesclosure
- a closure conditionSplits all items into two collections based on the closure condition. The first list contains all items which match the closure expression. The second list all those that don't.
Example usage:
assert [[2,4],[1,3]] == [1,2,3,4].split { it % 2 == 0 }
self
- a Collection of valuesclosure
- a closure conditionSplits all items into two collections based on the closure condition. The first list contains all items which match the closure expression. The second list all those that don't.
Example usage:
assert [[2,4],[1,3]] == [1,2,3,4].split { it % 2 == 0 }
self
- a List of valuesclosure
- a closure conditionSplits all items into two collections based on the closure condition. The first list contains all items which match the closure expression. The second list all those that don't.
Example usage:
assert [[2,4] as Set, [1,3] as Set] == ([1,2,3,4] as Set).split { it % 2 == 0 }
self
- a Set of valuesclosure
- a closure conditionSynonym for toSpreadMap(java.util.Map).
self
- a mapSprintf to a string.
self
- any Objectformat
- a format stringvalues
- values referenced by the format specifiers in the format stringReturns a formatted string using the specified format string and arguments.
self
- any Objectformat
- A format stringarg
- Argument which is referenced by the format specifiers in the format
string. The type of arg
should be one of Object[], List,
int[], short[], byte[], char[], boolean[], long[], float[], or double[].Iterates from this number up to the given number using a step increment. Each intermediate number is passed to the given closure. Example:
0.step( 10, 2 ) { println it }Prints even numbers 0 through 8.
self
- a Number to start withto
- a Number to go up to, exclusivestepNumber
- a Number representing the step incrementclosure
- the closure to callCreates a sub-Map containing the given keys. This method is similar to List.subList() but uses keys rather than index ranges.
assert [1:10, 2:20, 4:40].subMap( [2, 4] ) == [2:20, 4:40]
map
- a Mapkeys
- a Collection of keysCreates a sub-Map containing the given keys. This method is similar to List.subList() but uses keys rather than index ranges. The original map is unaltered.
def orig = [1:10, 2:20, 3:30, 4:40] assert orig.subMap([1, 3] as int[]) == [1:10, 3:30] assert orig.subMap([2, 4] as Integer[]) == [2:20, 4:40] assert orig.size() == 4
map
- a Mapkeys
- an array of keysFinds all non-null subsequences of a list.
Example usage:
def result = [1, 2, 3].subsequences() assert result == [[1, 2, 3], [1, 3], [2, 3], [1, 2], [1], [2], [3]] as Set
self
- the List of itemsSums the items in an Iterable. This is equivalent to invoking the "plus" method on all items in the Iterable.
assert 1+2+3+4 == [1,2,3,4].sum()
self
- Iterable of values to add togetherSums the items from an Iterator. This is equivalent to invoking the "plus" method on all items from the Iterator. The iterator will become exhausted of elements after determining the sum value.
self
- an Iterator for the values to add togetherSums the items in an Iterable, adding the result to some initial value.
assert 5+1+2+3+4 == [1,2,3,4].sum(5)
self
- an Iterable of values to suminitialValue
- the items in the collection will be summed to this initial valueSums the items from an Iterator, adding the result to some initial value. This is equivalent to invoking the "plus" method on all items from the Iterator. The iterator will become exhausted of elements after determining the sum value.
self
- an Iterator for the values to add togetherinitialValue
- the items in the collection will be summed to this initial value Sums the result of applying a closure to each item of an Iterable.
coll.sum(closure)
is equivalent to:
coll.collect(closure).sum()
.
assert 4+6+10+12 == [2,3,5,6].sum { it * 2 }
self
- an Iterableclosure
- a single parameter closure that returns a (typically) numeric value. Sums the result of applying a closure to each item returned from an iterator.
iter.sum(closure)
is equivalent to:
iter.collect(closure).sum()
. The iterator will become
exhausted of elements after determining the sum value.
self
- An Iteratorclosure
- a single parameter closure that returns a (typically) numeric value. Sums the result of applying a closure to each item of an Iterable to some initial value.
iter.sum(initVal, closure)
is equivalent to:
iter.collect(closure).sum(initVal)
.
assert 50+4+6+10+12 == [2,3,5,6].sum(50) { it * 2 }
self
- an Iterableclosure
- a single parameter closure that returns a (typically) numeric value.initialValue
- the closure results will be summed to this initial value Sums the result of applying a closure to each item of an Iterator to some initial value.
iter.sum(initVal, closure)
is equivalent to:
iter.collect(closure).sum(initVal)
. The iterator will become
exhausted of elements after determining the sum value.
self
- an Iteratorclosure
- a single parameter closure that returns a (typically) numeric value.initialValue
- the closure results will be summed to this initial valueSwaps two elements at the specified positions.
Example:
assert [1, 3, 2, 4] == [1, 2, 3, 4].swap(1, 2)
self
- a Listi
- a positionj
- a positionReturns the items from the List excluding the first item.
def list = [3, 4, 2] assert list.tail() == [4, 2] assert list == [3, 4, 2]
self
- a ListReturns the items from the SortedSet excluding the first item.
def sortedSet = [3, 4, 2] as SortedSet assert sortedSet.tail() == [3, 4] as SortedSet assert sortedSet == [3, 4, 2] as SortedSet
self
- a SortedSetReturns the items from the Iterable excluding the first item.
def list = [3, 4, 2] assert list.tail() == [4, 2] assert list == [3, 4, 2]
self
- an IterableReturns the original iterator after throwing away the first element.
self
- the original iteratorCalculates the tail values of this Iterable: the first value will be this list of all items from the iterable and the final one will be an empty list, with the intervening values the results of successive applications of tail on the items.
assert [1, 2, 3, 4].tails() == [[1, 2, 3, 4], [2, 3, 4], [3, 4], [4], []]
self
- an Iterable Returns the first num
elements from the head of this List.
def strings = [ 'a', 'b', 'c' ] assert strings.take( 0 ) == [] assert strings.take( 2 ) == [ 'a', 'b' ] assert strings.take( 5 ) == [ 'a', 'b', 'c' ]
self
- the original Listnum
- the number of elements to take from this Listnum
elements from this List,
or else all the elements from the List if it has less than num
elements. Returns the first num
elements from the head of this SortedSet.
def strings = [ 'a', 'b', 'c' ] as SortedSet assert strings.take( 0 ) == [] as SortedSet assert strings.take( 2 ) == [ 'a', 'b' ] as SortedSet assert strings.take( 5 ) == [ 'a', 'b', 'c' ] as SortedSet
self
- the original SortedSetnum
- the number of elements to take from this SortedSetnum
elements from this List,
or else all the elements from the SortedSet if it has less than num
elements. Returns the first num
elements from the head of this Iterable.
def strings = [ 'a', 'b', 'c' ] assert strings.take( 0 ) == [] assert strings.take( 2 ) == [ 'a', 'b' ] assert strings.take( 5 ) == [ 'a', 'b', 'c' ] class AbcIterable implements Iterable{ Iterator iterator() { "abc".iterator() } } def abc = new AbcIterable() assert abc.take(0) == [] assert abc.take(1) == ['a'] assert abc.take(3) == ['a', 'b', 'c'] assert abc.take(5) == ['a', 'b', 'c']
self
- the original Iterablenum
- the number of elements to take from this Iterablenum
elements from this Iterable,
or else all the elements from the Iterable if it has less than num
elements. Returns a new map containing the first num
elements from the head of this map.
If the map instance does not have ordered keys, then this function could return a random num
entries. Groovy by default uses LinkedHashMap, so this shouldn't be an issue in the main.
def strings = [ 'a':10, 'b':20, 'c':30 ] assert strings.take( 0 ) == [:] assert strings.take( 2 ) == [ 'a':10, 'b':20 ] assert strings.take( 5 ) == [ 'a':10, 'b':20, 'c':30 ]
self
- the original mapnum
- the number of elements to take from this mapnum
elements of this map,
or else the whole map if it has less than num
elements. Returns an iterator of up to the first num
elements from this iterator.
The original iterator is stepped along by num
elements.
def a = 0 def iter = [ hasNext:{ true }, next:{ a++ } ] as Iterator def iteratorCompare( Iterator a, List b ) { a.collect { it } == b } assert iteratorCompare( iter.take( 0 ), [] ) assert iteratorCompare( iter.take( 2 ), [ 0, 1 ] ) assert iteratorCompare( iter.take( 5 ), [ 2, 3, 4, 5, 6 ] )
self
- the Iteratornum
- the number of elements to take from this iteratornum
elements of this iterator. Returns the last num
elements from the tail of this Iterable.
def strings = [ 'a', 'b', 'c' ] assert strings.takeRight( 0 ) == [] assert strings.takeRight( 2 ) == [ 'b', 'c' ] assert strings.takeRight( 5 ) == [ 'a', 'b', 'c' ] class AbcIterable implements Iterable{ Iterator iterator() { "abc".iterator() } } def abc = new AbcIterable() assert abc.takeRight(0) == [] assert abc.takeRight(1) == ['c'] assert abc.takeRight(3) == ['a', 'b', 'c'] assert abc.takeRight(5) == ['a', 'b', 'c']
self
- the original Iterablenum
- the number of elements to take from this Iterablenum
elements from this Iterable,
or else all the elements from the Iterable if it has less than num
elements. Returns the last num
elements from the tail of this List.
def strings = [ 'a', 'b', 'c' ] assert strings.takeRight( 0 ) == [] assert strings.takeRight( 2 ) == [ 'b', 'c' ] assert strings.takeRight( 5 ) == [ 'a', 'b', 'c' ]
self
- the original Listnum
- the number of elements to take from this Listnum
elements from this List,
or else all the elements from the List if it has less than num
elements. Returns the last num
elements from the tail of this SortedSet.
def strings = [ 'a', 'b', 'c' ] as SortedSet assert strings.takeRight( 0 ) == [] as SortedSet assert strings.takeRight( 2 ) == [ 'b', 'c' ] as SortedSet assert strings.takeRight( 5 ) == [ 'a', 'b', 'c' ] as SortedSet
self
- the original SortedSetnum
- the number of elements to take from this SortedSetnum
elements from this SortedSet,
or else all the elements from the SortedSet if it has less than num
elements.Returns the longest prefix of this list where each element passed to the given closure condition evaluates to true. Similar to takeWhile(Iterable, groovy.lang.Closure) except that it attempts to preserve the type of the original list.
def nums = [ 1, 3, 2 ] assert nums.takeWhile{ it<
1 } == [] assert nums.takeWhile{ it<
3 } == [ 1 ] assert nums.takeWhile{ it<
4 } == [ 1, 3, 2 ]
self
- the original listcondition
- the closure that must evaluate to true to
continue taking elementsReturns a Collection containing the longest prefix of the elements from this Iterable where each element passed to the given closure evaluates to true.
class AbcIterable implements Iterable{ Iterator iterator() { "abc".iterator() } } def abc = new AbcIterable() assert abc.takeWhile{ it <
'b' } == ['a'] assert abc.takeWhile{ it<=
'b' } == ['a', 'b']
self
- an Iterablecondition
- the closure that must evaluate to true to
continue taking elementsReturns the longest prefix of this SortedSet where each element passed to the given closure condition evaluates to true. Similar to takeWhile(Iterable, groovy.lang.Closure) except that it attempts to preserve the type of the original SortedSet.
def nums = [ 1, 2, 3 ] as SortedSet assert nums.takeWhile{ it<
1 } == [] as SortedSet assert nums.takeWhile{ it<
2 } == [ 1 ] as SortedSet assert nums.takeWhile{ it<
4 } == [ 1, 2, 3 ] as SortedSet
self
- the original SortedSetcondition
- the closure that must evaluate to true to
continue taking elementsReturns the longest prefix of this Map where each entry (or key/value pair) when passed to the given closure evaluates to true.
def shopping = [milk:1, bread:2, chocolate:3] assert shopping.takeWhile{ it.key.size()If the map instance does not have ordered keys, then this function could appear to take random entries. Groovy by default uses LinkedHashMap, so this shouldn't be an issue in the main.<
6 } == [milk:1, bread:2] assert shopping.takeWhile{ it.value % 2 } == [milk:1] assert shopping.takeWhile{ k, v->
k.size() + v<=
7 } == [milk:1, bread:2]
self
- a Mapcondition
- a 1 (or 2) arg Closure that must evaluate to true for the
entry (or key and value) to continue taking elementsReturns the longest prefix of elements in this iterator where each element passed to the given condition closure evaluates to true.
def a = 0 def iter = [ hasNext:{ true }, next:{ a++ } ] as Iterator assert [].iterator().takeWhile{ it<
3 }.toList() == [] assert [1, 2, 3, 4, 5].iterator().takeWhile{ it<
3 }.toList() == [ 1, 2 ] assert iter.takeWhile{ it<
5 }.toList() == [ 0, 1, 2, 3, 4 ]
self
- the Iteratorcondition
- the closure that must evaluate to true to
continue taking elements Allows the closure to be called for the object reference self (similar
to with
) and always returns self.
Any method invoked inside the closure will first be invoked on the self reference. For instance, the following method calls to the append() method are invoked on the StringBuilder instance:
def b = new StringBuilder().tap { append('foo') append('bar') } assert b.toString() == 'foobar'This is commonly used to simplify object creation, such as this example:
def p = new Person().tap { firstName = 'John' lastName = 'Doe' }
self
- the object to have a closure act uponclosure
- the closure to call on the objectExecutes the closure this many times, starting from zero. The current index is passed to the closure each time. Example:
10.times { println it }Prints the numbers 0 through 9.
self
- a Numberclosure
- the closure to call a number of timesTransforms a Number into a BigDecimal.
self
- a NumberTransforms this Number into a BigInteger.
self
- a NumberIdentity conversion which returns Boolean.TRUE for a true Boolean and Boolean.FALSE for a false Boolean.
self
- a BooleanTransforms a Number into a Double.
self
- a NumberTransforms a Number into a Float.
self
- a NumberTransforms a Number into an Integer.
self
- a NumberConvert an iterator to a List. The iterator will become exhausted of elements after making this conversion.
self
- an iteratorConvert an Iterable to a List. The Iterable's iterator will become exhausted of elements after making this conversion.
Example usage:
def x = [1,2,3] as HashSet assert x.class == HashSet assert x.toList() instanceof List
self
- an IterableConvert an enumeration to a List.
self
- an enumeration Returns the string representation of the given list. The string
displays the contents of the list, similar to a list literal, i.e.
[1, 2, a]
.
self
- a Collection Returns the string representation of the given list. The string
displays the contents of the list, similar to a list literal, i.e.
[1, 2, a]
.
self
- a CollectionmaxSize
- stop after approximately this many characters and append '...'Transforms a Number into a Long.
self
- a NumberConverts the character to lowercase. Synonym for 'Character.toLowerCase(this)'.
self
- a Character to convert Returns the string representation of this map. The string displays the
contents of the map, i.e. [one:1, two:2, three:3]
.
self
- a Map Returns the string representation of this map. The string displays the
contents of the map, i.e. [one:1, two:2, three:3]
.
self
- a MapmaxSize
- stop after approximately this many characters and append '...'Convert a Collection to a Set. Always returns a new Set even if the Collection is already a Set.
Example usage:
def result = [1, 2, 2, 2, 3].toSet() assert result instanceof Set assert result == [1, 2, 3] as Set
self
- a collectionConvert an Iterable to a Set. Always returns a new Set even if the Iterable is already a Set.
Example usage:
def result = [1, 2, 2, 2, 3].toSet() assert result instanceof Set assert result == [1, 2, 3] as Set
self
- an IterableConvert an iterator to a Set. The iterator will become exhausted of elements after making this conversion.
self
- an iteratorConvert an enumeration to a Set.
self
- an enumeration Sorts the Iterable. Assumes that the Iterable elements are
comparable and uses a NumberAwareComparator to determine the resulting order.
NumberAwareComparator
has special treatment for numbers but otherwise uses the
natural ordering of the Iterable elements. The elements are first placed into a new list which
is then sorted and returned - leaving the original Iterable unchanged.
def orig = [1, 3, 2] def sorted = orig.toSorted() assert orig == [1, 3, 2] assert sorted == [1, 2, 3]
self
- the Iterable to be sortedSorts the Iterable using the given Comparator. The elements are first placed into a new list which is then sorted and returned - leaving the original Iterable unchanged.
def orig = ["hello","hi","Hey"] def sorted = orig.toSorted(String.CASE_INSENSITIVE_ORDER) assert orig == ["hello","hi","Hey"] assert sorted == ["hello","Hey","hi"]
self
- the Iterable to be sortedcomparator
- a Comparator used for the comparisonSorts this Iterable using the given Closure to determine the correct ordering. The elements are first placed into a new list which is then sorted and returned - leaving the original Iterable unchanged.
If the Closure has two parameters it is used like a traditional Comparator. I.e. it should compare its two parameters for order, returning a negative integer, zero, or a positive integer when the first parameter is less than, equal to, or greater than the second respectively. Otherwise, the Closure is assumed to take a single parameter and return a Comparable (typically an Integer) which is then used for further comparison.
assert ["hi","hey","hello"] == ["hello","hi","hey"].sort { it.length() }
assert ["hi","hey","hello"] == ["hello","hi","hey"].sort { a, b->
a.length()<=>
b.length() }
self
- the Iterable to be sortedclosure
- a 1 or 2 arg Closure used to determine the correct ordering Sorts the Iterator. Assumes that the Iterator elements are
comparable and uses a NumberAwareComparator to determine the resulting order.
NumberAwareComparator
has special treatment for numbers but otherwise uses the
natural ordering of the Iterator elements.
A new iterator is produced that traverses the items in sorted order.
self
- the Iterator to be sortedSorts the given iterator items using the comparator. The original iterator will become exhausted of elements after completing this method call. A new iterator is produced that traverses the items in sorted order.
self
- the Iterator to be sortedcomparator
- a Comparator used for comparing itemsSorts the given iterator items into a sorted iterator using the Closure to determine the correct ordering. The original iterator will be fully processed after the method call.
If the closure has two parameters it is used like a traditional Comparator. I.e. it should compare its two parameters for order, returning a negative integer, zero, or a positive integer when the first parameter is less than, equal to, or greater than the second respectively. Otherwise, the Closure is assumed to take a single parameter and return a Comparable (typically an Integer) which is then used for further comparison.
self
- the Iterator to be sortedclosure
- a Closure used to determine the correct ordering Sorts the elements from the given map into a new ordered map using
a NumberAwareComparator on map entry values to determine the resulting order.
NumberAwareComparator
has special treatment for numbers but otherwise uses the
natural ordering of the Iterator elements. The original map is unchanged.
def map = [a:5L, b:3, c:6, d:4.0].toSorted() assert map.toString() == '[b:3, d:4.0, a:5, c:6]'
self
- the original unsorted mapSorts the elements from the given map into a new ordered map using the supplied comparator to determine the ordering. The original map is unchanged.
def keyComparator = [compare: { e1, e2->
e1.key<=>
e2.key }] as Comparator def valueComparator = [compare: { e1, e2->
e1.value<=>
e2.value }] as Comparator def map1 = [a:5, b:3, d:4, c:6].toSorted(keyComparator) assert map1.toString() == '[a:5, b:3, c:6, d:4]' def map2 = [a:5, b:3, d:4, c:6].toSorted(valueComparator) assert map2.toString() == '[b:3, d:4, a:5, c:6]'
self
- the original unsorted mapcomparator
- a Comparator used for the comparisonSorts the elements from the given map into a new ordered map using the supplied Closure condition as a comparator to determine the ordering. The original map is unchanged.
If the closure has two parameters it is used like a traditional Comparator. I.e. it should compare its two entry parameters for order, returning a negative integer, zero, or a positive integer when the first parameter is less than, equal to, or greater than the second respectively. Otherwise, the Closure is assumed to take a single entry parameter and return a Comparable (typically an Integer) which is then used for further comparison.
def map = [a:5, b:3, c:6, d:4].toSorted { a, b->
a.value<=>
b.value } assert map.toString() == '[b:3, d:4, a:5, c:6]'
self
- the original unsorted mapcondition
- a Closure used as a comparatorAvoids doing unnecessary work when sorting an already sorted set
self
- an already sorted setAvoids doing unnecessary work when sorting an already sorted map
self
- an already sorted map Returns a new SpreadMap
from this map.
The example below shows the various possible use cases:
def fn(Map m) { return m.a + m.b + m.c + m.d } assert fn(a:1, b:2, c:3, d:4) == 10 assert fn(a:1, *:[b:2, c:3], d:4) == 10 assert fn([a:1, b:2, c:3, d:4].toSpreadMap()) == 10 assert fn((['a', 1, 'b', 2, 'c', 3, 'd', 4] as Object[]).toSpreadMap()) == 10 assert fn(['a', 1, 'b', 2, 'c', 3, 'd', 4].toSpreadMap()) == 10 assert fn(['abcd'.toList(), 1..4].transpose().flatten().toSpreadMap()) == 10Note that toSpreadMap() is not normally used explicitly but under the covers by Groovy.
self
- a map to be converted into a SpreadMapCreates a spreadable map from this list.
self
- a listCreates a spreadable map from this iterable.
self
- an iterableReturns the string representation of the given map.
self
- a Map Returns the string representation of the given collection. The string
displays the contents of the collection, i.e.
[1, 2, a]
.
self
- a CollectionCreate a String representation of this object.
value
- an objectReturns an iterator equivalent to this iterator but with all duplicated items removed where duplicate (equal) items are deduced by calling the supplied Closure condition.
If the supplied Closure takes a single parameter, the argument passed will be each element, and the closure should return a value used for comparison (either using Comparable.compareTo or Object.equals). If the closure takes two parameters, two items from the Iterator will be passed as arguments, and the closure should return an int value (with 0 indicating the items are not unique).
def items = "Hello".toList() + [null, null] + "there".toList() def toLower = { it == null ? null : it.toLowerCase() } def noDups = items.iterator().toUnique(toLower).toList() assert noDups == ['H', 'e', 'l', 'o', null, 't', 'r']
assert [1,4] == [1,3,4,5].toUnique { it % 2 }
assert [2,3,4] == [2,3,3,4].toUnique { a, b->
a<=>
b }
self
- an Iteratorcondition
- a Closure used to determine unique itemsReturns an iterator equivalent to this iterator with all duplicated items removed by using the supplied comparator.
self
- an Iteratorcomparator
- a Comparator used to determine unique (equal) items
If null
, the Comparable natural ordering of the elements will be used.Returns an iterator equivalent to this iterator with all duplicated items removed by using the natural ordering of the items.
self
- an IteratorReturns a Collection containing the items from the Iterable but with duplicates removed. The items in the Iterable are compared by the given Comparator. For each duplicate, the first member which is returned from the Iterable is retained, but all other ones are removed.
class Person {
def fname, lname
String toString() {
return fname + " " + lname
}
}
class PersonComparator implements Comparator {
int compare(Object o1, Object o2) {
Person p1 = (Person) o1
Person p2 = (Person) o2
if (p1.lname != p2.lname)
return p1.lname.compareTo(p2.lname)
else
return p1.fname.compareTo(p2.fname)
}
boolean equals(Object obj) {
return this.equals(obj)
}
}
Person a = new Person(fname:"John", lname:"Taylor")
Person b = new Person(fname:"Clark", lname:"Taylor")
Person c = new Person(fname:"Tom", lname:"Cruz")
Person d = new Person(fname:"Clark", lname:"Taylor")
def list = [a, b, c, d]
List list2 = list.toUnique(new PersonComparator())
assert list2 == [a, b, c] &&
list == [a, b, c, d]
self
- an Iterablecomparator
- a Comparator used to determine unique (equal) items
If null
, the Comparable natural ordering of the elements will be used.Returns a List containing the items from the List but with duplicates removed. The items in the List are compared by the given Comparator. For each duplicate, the first member which is returned from the List is retained, but all other ones are removed.
class Person {
def fname, lname
String toString() {
return fname + " " + lname
}
}
class PersonComparator implements Comparator {
int compare(Object o1, Object o2) {
Person p1 = (Person) o1
Person p2 = (Person) o2
if (p1.lname != p2.lname)
return p1.lname.compareTo(p2.lname)
else
return p1.fname.compareTo(p2.fname)
}
boolean equals(Object obj) {
return this.equals(obj)
}
}
Person a = new Person(fname:"John", lname:"Taylor")
Person b = new Person(fname:"Clark", lname:"Taylor")
Person c = new Person(fname:"Tom", lname:"Cruz")
Person d = new Person(fname:"Clark", lname:"Taylor")
def list = [a, b, c, d]
List list2 = list.toUnique(new PersonComparator())
assert list2 == [a, b, c] &&
list == [a, b, c, d]
self
- a Listcomparator
- a Comparator used to determine unique (equal) items
If null
, the Comparable natural ordering of the elements will be used.Returns a Collection containing the items from the Iterable but with duplicates removed using the natural ordering of the items to determine uniqueness.
String[] letters = ['c', 'a', 't', 's', 'a', 't', 'h', 'a', 't'] String[] expected = ['c', 'a', 't', 's', 'h'] assert letters.toUnique() == expected
self
- an IterableReturns a List containing the items from the List but with duplicates removed using the natural ordering of the items to determine uniqueness.
def letters = ['c', 'a', 't', 's', 'a', 't', 'h', 'a', 't'] def expected = ['c', 'a', 't', 's', 'h'] assert letters.toUnique() == expected
self
- a ListReturns a Collection containing the items from the Iterable but with duplicates removed. The items in the Iterable are compared by the given Closure condition. For each duplicate, the first member which is returned from the Iterable is retained, but all other ones are removed.
If the closure takes a single parameter, each element from the Iterable will be passed to the closure. The closure should return a value used for comparison (either using Comparable.compareTo or Object.equals). If the closure takes two parameters, two items from the Iterable will be passed as arguments, and the closure should return an int value (with 0 indicating the items are not unique).
class Person { def fname, lname String toString() { return fname + " " + lname } } Person a = new Person(fname:"John", lname:"Taylor") Person b = new Person(fname:"Clark", lname:"Taylor") Person c = new Person(fname:"Tom", lname:"Cruz") Person d = new Person(fname:"Clark", lname:"Taylor") def list = [a, b, c, d] def list2 = list.toUnique{ p1, p2->
p1.lname != p2.lname ? p1.lname <=> p2.lname : p1.fname <=> p2.fname } assert( list2 == [a, b, c]&&
list == [a, b, c, d] ) def list3 = list.toUnique{ it.toString() } assert( list3 == [a, b, c]&&
list == [a, b, c, d] )
self
- an Iterablecondition
- a Closure used to determine unique itemsReturns a List containing the items from the List but with duplicates removed. The items in the List are compared by the given Closure condition. For each duplicate, the first member which is returned from the Iterable is retained, but all other ones are removed.
If the closure takes a single parameter, each element from the Iterable will be passed to the closure. The closure should return a value used for comparison (either using Comparable.compareTo or Object.equals). If the closure takes two parameters, two items from the Iterable will be passed as arguments, and the closure should return an int value (with 0 indicating the items are not unique).
class Person { def fname, lname String toString() { return fname + " " + lname } } Person a = new Person(fname:"John", lname:"Taylor") Person b = new Person(fname:"Clark", lname:"Taylor") Person c = new Person(fname:"Tom", lname:"Cruz") Person d = new Person(fname:"Clark", lname:"Taylor") def list = [a, b, c, d] def list2 = list.toUnique{ p1, p2->
p1.lname != p2.lname ? p1.lname <=> p2.lname : p1.fname <=> p2.fname } assert( list2 == [a, b, c]&&
list == [a, b, c, d] ) def list3 = list.toUnique{ it.toString() } assert( list3 == [a, b, c]&&
list == [a, b, c, d] )
self
- a Listcondition
- a Closure used to determine unique itemsConverts the character to uppercase. Synonym for 'Character.toUpperCase(this)'.
self
- a Character to convertAdds GroovyCollections#transpose(List) as a method on lists. A Transpose Function takes a collection of columns and returns a collection of rows. The first row consists of the first element from each column. Successive rows are constructed similarly.
Example usage:
def result = [['a', 'b'], [1, 2]].transpose() assert result == [['a', 1], ['b', 2]]
def result = [['a', 'b'], [1, 2], [3, 4]].transpose() assert result == [['a', 1, 3], ['b', 2, 4]]
self
- a List of listsTruncate the value
number
- a Floatprecision
- the number of decimal places to keepTruncate the value
number
- a FloatTruncate the value
number
- a DoubleTruncate the value
number
- a Doubleprecision
- the number of decimal places to keepTruncate the value
number
- a BigDecimalTruncate the value
number
- a BigDecimalprecision
- the number of decimal places to keep Negates the number. Equivalent to the '-' operator when it precedes
a single operand, i.e. -10
left
- a Number Returns the number, effectively being a noop for numbers.
Operator overloaded form of the '+' operator when it precedes
a single operand, i.e. +10
left
- a NumberCreate a Collection composed of the union of both collections. Any elements that exist in either collections are added to the resultant collection, such that no elements are duplicated in the resultant collection. For collections of custom objects; the objects should implement java.lang.Comparable
assert [1,2,3,4,5,6,7,8] == [1,2,3,4,5].union([4,5,6,7,8])By default, Groovy uses a NumberAwareComparator when determining if an element exists in the resultant collection.
left
- a Collectionright
- a CollectionCreate a Collection composed of the union of both collections. Any elements that exist in either collections are added to the resultant collection, such that no elements are duplicated in the resultant collection. For collections of custom objects; the objects should implement java.lang.Comparable
assert [1,2,3,4,5,6] == [1,2,3,4].union([3,4,5,6], Comparator.naturalOrder())
assert [4,8,12,16,20,1,3] == [4,8,12,16,20].union([1,2,3,4], (x, y) -> x * x <=> y
)
def one = ['a', 'B', 'c', 'd'] def two = ['b', 'C', 'd', 'e'] def compareIgnoreCase = { a, b->
a.toLowerCase()<=>
b.toLowerCase() } assert one.union(two) == ['a', 'B', 'c', 'd', 'b', 'C', 'e'] assert two.union(one) == ['b', 'C', 'd', 'e', 'a', 'B', 'c'] assert one.union(two, compareIgnoreCase) == ['a', 'B', 'c', 'd', 'e'] assert two.union(one, compareIgnoreCase) == ['b', 'C', 'd', 'e', 'a']
left
- a Collectionright
- a Collectioncomparator
- a ComparatorCreate a Collection composed of the union of both iterables. Any elements that exist in either iterables are added to the resultant collection, such that no elements are duplicated in the resultant collection. For iterables of custom objects; the objects should implement java.lang.Comparable
assert [1,2,3,4,5,6,7,8] == [1,2,3,4,5].union([4,5,6,7,8])By default, Groovy uses a NumberAwareComparator when determining if an element already exists in the resultant collection.
left
- an Iterableright
- an IterableCreate a Collection composed of the union of both iterables. Any elements that exist in either iterables are added to the resultant collection, such that no elements are duplicated in the resultant collection. For iterables of custom objects; the objects should implement java.lang.Comparable
assert [1,2,3,4,5,6] == [1,2,3,4].union([3,4,5,6], Comparator.naturalOrder())
left
- an Iterableright
- an Iterablecomparator
- a ComparatorCreate a Collection composed of the union of both iterables. Elements from the first iterable and second iterable are added to the result if the elements are not already in the result (according to the comparator closure). If the closure takes a single parameter, the argument passed will be each element, and the closure should return a value used for comparison (either using Comparable.compareTo or Object.equals). If the closure takes two parameters, two items from the Iterator will be passed as arguments, and the closure should return an int value (with 0 indicating the items are deemed equal).
def one = ['a', 'B', 'c', 'd'] def two = ['b', 'C', 'd', 'e'] def compareIgnoreCase = { it.toLowerCase() } assert one.union(two, compareIgnoreCase) == ['a', 'B', 'c', 'd', 'e'] assert two.union(one, compareIgnoreCase) == ['b', 'C', 'd', 'e', 'a']
left
- an Iterableright
- an Iterablecondition
- a Closure used to determine unique itemsCreate a List composed of the union of a List and an Iterable. Any elements that exist in both iterables are added to the resultant collection, such that no elements are duplicated in the resultant collection.
assert [1,2,3,4,5,6,7,8] == [1,2,3,4,5].union([4,5,6,7,8])By default, Groovy uses a NumberAwareComparator when determining if an element already exists in the resultant collection.
left
- a Listright
- an IterableCreate a List composed of the union of a List and an Iterable. Any elements that exist in either iterables are added to the resultant collection, such that no elements are duplicated in the resultant collection.
assert [1,2,3,4,5,6] == [1,2,3,4].union([3,4,5,6])
left
- a Listright
- an Iterablecomparator
- a ComparatorCreate a Set composed of the union of a Set and an Iterable. Any elements that exist in either iterables are added to the resultant collection, such that no elements are duplicated in the resultant collection.
assert [1,2,3,4,5,6,7,8] as Set == ([1,2,3,4,5] as Set).union([4,5,6,7,8])By default, Groovy uses a NumberAwareComparator when determining if an element already exists in the resultant collection.
left
- a Setright
- an IterableCreate a Set composed of the union of a Set and an Iterable. Any elements that exist in either iterables are added to the resultant collection, such that no elements are duplicated in the resultant collection.
assert [1,2,3,4,5,6] as Set == ([1,2,3,4] as Set).union([3,4,5,6], Comparator.naturalOrder())
left
- a Setright
- an Iterablecomparator
- a ComparatorCreate a SortedSet composed of the union of a SortedSet and an Iterable. Any elements that exist in either iterables are added to the resultant collection, such that no elements are duplicated in the resultant collection.
assert [1,2,3,4,5,6,7,8] as SortedSet == ([1,2,3,4,5] as SortedSet).union([4,5,6,7,8])By default, Groovy uses a NumberAwareComparator when determining if an element already exists in the resultant collection.
left
- a SortedSetright
- an IterableCreate a SortedSet composed of the intersection of a SortedSet and an Iterable. Any elements that exist in either iterables are added to the resultant collection, such that no elements are duplicated in the resultant collection.
assert [1,2,3,4,5,6,7,8] as SortedSet == ([1,2,3,4,5] as SortedSet).union([4,5,6,7,8])
left
- a SortedSetright
- an Iterablecomparator
- a ComparatorReturns an iterator equivalent to this iterator with all duplicated items removed by using Groovy's default number-aware comparator. The original iterator will become exhausted of elements after determining the unique values. A new iterator for the unique values will be returned.
self
- an IteratorModifies this collection to remove all duplicated items, using Groovy's default number-aware comparator.
assert [1,3] == [1,3,3].unique()
self
- a collectionModifies this List to remove all duplicated items, using Groovy's default number-aware comparator.
assert [1,3] == [1,3,3].unique()
self
- a ListRemove all duplicates from a given Collection using Groovy's default number-aware comparator. If mutate is true, it works by modifying the original object (and also returning it). If mutate is false, a new collection is returned leaving the original unchanged.
assert [1,3] == [1,3,3].unique()
def orig = [1, 3, 2, 3] def uniq = orig.unique(false) assert orig == [1, 3, 2, 3] assert uniq == [1, 3, 2]
self
- a collectionmutate
- false will return a new collection containing the unique items from the collection, true will mutate collections in place and return the original collectionRemove all duplicates from a given List using Groovy's default number-aware comparator. If mutate is true, it works by modifying the original object (and also returning it). If mutate is false, a new collection is returned leaving the original unchanged.
assert [1,3] == [1,3,3].unique()
def orig = [1, 3, 2, 3] def uniq = orig.unique(false) assert orig == [1, 3, 2, 3] assert uniq == [1, 3, 2]
self
- a Listmutate
- false will cause a new List containing unique items from the List to be created, true will mutate List in placeReturns an iterator equivalent to this iterator but with all duplicated items removed by using a Closure to determine duplicate (equal) items. The original iterator will be fully processed after the call.
If the closure takes a single parameter, the argument passed will be each element, and the closure should return a value used for comparison (either using Comparable.compareTo or Object.equals). If the closure takes two parameters, two items from the Iterator will be passed as arguments, and the closure should return an int value (with 0 indicating the items are not unique).
self
- an Iteratorcondition
- a Closure used to determine unique itemsA convenience method for making a collection unique using a Closure to determine duplicate (equal) items.
If the closure takes a single parameter, the argument passed will be each element, and the closure should return a value used for comparison (either using Comparable.compareTo or Object.equals). If the closure takes two parameters, two items from the collection will be passed as arguments, and the closure should return an int value (with 0 indicating the items are not unique).
assert [1,4] == [1,3,4,5].unique { it % 2 }
assert [2,3,4] == [2,3,3,4].unique { a, b->
a<=>
b }
self
- a Collectionclosure
- a 1 or 2 arg Closure used to determine unique itemsA convenience method for making a List unique using a Closure to determine duplicate (equal) items.
If the closure takes a single parameter, the argument passed will be each element, and the closure should return a value used for comparison (either using Comparable.compareTo or Object.equals). If the closure takes two parameters, two items from the List will be passed as arguments, and the closure should return an int value (with 0 indicating the items are not unique).
assert [1,4] == [1,3,4,5].unique { it % 2 }
assert [2,3,4] == [2,3,3,4].unique { a, b->
a<=>
b }
self
- a Listclosure
- a 1 or 2 arg Closure used to determine unique itemsA convenience method for making a collection unique using a Closure to determine duplicate (equal) items. If mutate is true, it works on the receiver object and returns it. If mutate is false, a new collection is returned.
If the closure takes a single parameter, each element from the Collection will be passed to the closure. The closure should return a value used for comparison (either using Comparable.compareTo or Object.equals). If the closure takes two parameters, two items from the collection will be passed as arguments, and the closure should return an int value (with 0 indicating the items are not unique).
def orig = [1, 3, 4, 5] def uniq = orig.unique(false) { it % 2 } assert orig == [1, 3, 4, 5] assert uniq == [1, 4]
def orig = [2, 3, 3, 4] def uniq = orig.unique(false) { a, b->
a<=>
b } assert orig == [2, 3, 3, 4] assert uniq == [2, 3, 4]
self
- a Collectionmutate
- false will always cause a new list to be created, true will mutate lists in placeclosure
- a 1 or 2 arg Closure used to determine unique itemsA convenience method for making a List unique using a Closure to determine duplicate (equal) items. If mutate is true, it works on the receiver object and returns it. If mutate is false, a new collection is returned.
If the closure takes a single parameter, each element from the List will be passed to the closure. The closure should return a value used for comparison (either using Comparable.compareTo or Object.equals). If the closure takes two parameters, two items from the collection will be passed as arguments, and the closure should return an int value (with 0 indicating the items are not unique).
def orig = [1, 3, 4, 5] def uniq = orig.unique(false) { it % 2 } assert orig == [1, 3, 4, 5] assert uniq == [1, 4]
def orig = [2, 3, 3, 4] def uniq = orig.unique(false) { a, b->
a<=>
b } assert orig == [2, 3, 3, 4] assert uniq == [2, 3, 4]
self
- a Listmutate
- false will always cause a new list to be created, true will mutate lists in placeclosure
- a 1 or 2 arg Closure used to determine unique itemsReturns an iterator equivalent to this iterator with all duplicated items removed by using the supplied comparator. The original iterator will be exhausted upon returning.
self
- an Iteratorcomparator
- a ComparatorRemove all duplicates from a given Collection. Works on the original object (and also returns it). The order of members in the Collection are compared by the given Comparator. For each duplicate, the first member which is returned by the given Collection's iterator is retained, but all other ones are removed. The given Collection's original order is preserved.
class Person {
def fname, lname
String toString() {
return fname + " " + lname
}
}
class PersonComparator implements Comparator {
int compare(Object o1, Object o2) {
Person p1 = (Person) o1
Person p2 = (Person) o2
if (p1.lname != p2.lname)
return p1.lname.compareTo(p2.lname)
else
return p1.fname.compareTo(p2.fname)
}
boolean equals(Object obj) {
return this.equals(obj)
}
}
Person a = new Person(fname:"John", lname:"Taylor")
Person b = new Person(fname:"Clark", lname:"Taylor")
Person c = new Person(fname:"Tom", lname:"Cruz")
Person d = new Person(fname:"Clark", lname:"Taylor")
def list = [a, b, c, d]
List list2 = list.unique(new PersonComparator())
assert( list2 == list &&
list == [a, b, c] )
self
- a Collectioncomparator
- a ComparatorRemove all duplicates from a given List. Works on the original object (and also returns it). The order of members in the List are compared by the given Comparator. For each duplicate, the first member which is returned by the given List's iterator is retained, but all other ones are removed. The given List's original order is preserved.
class Person {
def fname, lname
String toString() {
return fname + " " + lname
}
}
class PersonComparator implements Comparator {
int compare(Object o1, Object o2) {
Person p1 = (Person) o1
Person p2 = (Person) o2
if (p1.lname != p2.lname)
return p1.lname.compareTo(p2.lname)
else
return p1.fname.compareTo(p2.fname)
}
boolean equals(Object obj) {
return this.equals(obj)
}
}
Person a = new Person(fname:"John", lname:"Taylor")
Person b = new Person(fname:"Clark", lname:"Taylor")
Person c = new Person(fname:"Tom", lname:"Cruz")
Person d = new Person(fname:"Clark", lname:"Taylor")
def list = [a, b, c, d]
List list2 = list.unique(new PersonComparator())
assert( list2 == list &&
list == [a, b, c] )
self
- a Listcomparator
- a ComparatorRemove all duplicates from a given Collection. If mutate is true, it works on the original object (and also returns it). If mutate is false, a new collection is returned. The order of members in the Collection are compared by the given Comparator. For each duplicate, the first member which is returned by the given Collection's iterator is retained, but all other ones are removed. The given Collection's original order is preserved.
class Person {
def fname, lname
String toString() {
return fname + " " + lname
}
}
class PersonComparator implements Comparator {
int compare(Object o1, Object o2) {
Person p1 = (Person) o1
Person p2 = (Person) o2
if (p1.lname != p2.lname)
return p1.lname.compareTo(p2.lname)
else
return p1.fname.compareTo(p2.fname)
}
boolean equals(Object obj) {
return this.equals(obj)
}
}
Person a = new Person(fname:"John", lname:"Taylor")
Person b = new Person(fname:"Clark", lname:"Taylor")
Person c = new Person(fname:"Tom", lname:"Cruz")
Person d = new Person(fname:"Clark", lname:"Taylor")
def list = [a, b, c, d]
List list2 = list.unique(false, new PersonComparator())
assert( list2 != list &&
list2 == [a, b, c] )
self
- a Collectionmutate
- false will always cause a new collection to be created, true will mutate collections in placecomparator
- a ComparatorRemove all duplicates from a given List. If mutate is true, it works on the original object (and also returns it). If mutate is false, a new List is returned. The order of members in the List are compared by the given Comparator. For each duplicate, the first member which is returned by the given List's iterator is retained, but all other ones are removed. The given List's original order is preserved.
class Person {
def fname, lname
String toString() {
return fname + " " + lname
}
}
class PersonComparator implements Comparator {
int compare(Object o1, Object o2) {
Person p1 = (Person) o1
Person p2 = (Person) o2
if (p1.lname != p2.lname)
return p1.lname.compareTo(p2.lname)
else
return p1.fname.compareTo(p2.fname)
}
boolean equals(Object obj) {
return this.equals(obj)
}
}
Person a = new Person(fname:"John", lname:"Taylor")
Person b = new Person(fname:"Clark", lname:"Taylor")
Person c = new Person(fname:"Tom", lname:"Cruz")
Person d = new Person(fname:"Clark", lname:"Taylor")
def list = [a, b, c, d]
List list2 = list.unique(false, new PersonComparator())
assert( list2 != list &&
list2 == [a, b, c] )
self
- a Listmutate
- false will always cause a new List to be created, true will mutate List in placecomparator
- a ComparatorIterates from this number up to the given number, inclusive, incrementing by one each time.
self
- a Numberto
- another Number to go up toclosure
- the closure to callIterates from this number up to the given number, inclusive, incrementing by one each time.
self
- a longto
- the end numberclosure
- the code to execute for each numberIterates from this number up to the given number, inclusive, incrementing by one each time.
self
- a Longto
- the end numberclosure
- the code to execute for each numberIterates from this number up to the given number, inclusive, incrementing by one each time.
self
- a floatto
- the end numberclosure
- the code to execute for each numberIterates from this number up to the given number, inclusive, incrementing by one each time.
self
- a Floatto
- the end numberclosure
- the code to execute for each numberIterates from this number up to the given number, inclusive, incrementing by one each time.
self
- a doubleto
- the end numberclosure
- the code to execute for each numberIterates from this number up to the given number, inclusive, incrementing by one each time.
self
- a Doubleto
- the end numberclosure
- the code to execute for each numberIterates from this number up to the given number, inclusive, incrementing by one each time. Example:
0.upto( 10 ) { println it }Prints numbers 0 to 10
self
- a BigIntegerto
- the end numberclosure
- the code to execute for each numberIterates from this number up to the given number, inclusive, incrementing by one each time.
0.1.upto( 10 ) { println it }Prints numbers 0.1, 1.1, 2.1... to 9.1
self
- a BigDecimalto
- the end numberclosure
- the code to execute for each numberScoped use method
self
- any ObjectcategoryClass
- a category class to useclosure
- the closure to invoke with the category in placeScoped use method with list of categories.
self
- any ObjectcategoryClassList
- a list of category classesclosure
- the closure to invoke with the categories in place Allows you to use a list of categories, specifying the list as varargs.
use(CategoryClass1, CategoryClass2) { ... }
This method saves having to wrap the category
classes in a list.
self
- any Objectarray
- a list of category classes and a ClosureAllows the closure to be called for the object reference self.
Any method invoked inside the closure will first be invoked on the self reference. For instance, the following method calls to the append() method are invoked on the StringBuilder instance:
def b = new StringBuilder().with { append('foo') append('bar') return it } assert b.toString() == 'foobar'This is commonly used to simplify object creation, such as this example:
def p = new Person().with { firstName = 'John' lastName = 'Doe' return it }The other typical usage, uses the self object while creating some value:
def fullName = person.with{ "$firstName $lastName" }
self
- the object to have a closure act uponclosure
- the closure to call on the objectAllows the closure to be called for the object reference self.
Any method invoked inside the closure will first be invoked on the self reference. For example, the following method calls to the append() method are invoked on the StringBuilder instance and then, because 'returning' is true, the self instance is returned:def b = new StringBuilder().with(true) { append('foo') append('bar') } assert b.toString() == 'foobar'The returning parameter is commonly set to true when using with to simplify object creation, such as this example:
def p = new Person().with(true) { firstName = 'John' lastName = 'Doe' }Alternatively, 'tap' is an alias for 'with(true)', so that method can be used instead. The other main use case for with is when returning a value calculated using self as shown here:
def fullName = person.with(false){ "$firstName $lastName" }Alternatively, 'with' is an alias for 'with(false)', so the boolean parameter can be omitted instead.
self
- the object to have a closure act uponreturnIt
- if true, return the self object; otherwise, the result of calling the closureclosure
- the closure to call on the objectreturnIt
A variant of withCollectedKeys for Iterators.
values
- an Iteratorcollector
- the Map into which the transformed entries are putkeyTransform
- a function for transforming Iterator elements into valuesA variant of withCollectedKeys for Iterators.
values
- an IteratorkeyTransform
- a function for transforming Iterator elements into valuesTransform Iterable elements into Map entries with values unchanged and keys transformed using the supplied function. The supplied map is used as the destination for transformed entries.
def languages = ['Groovy', 'Java', 'Kotlin', 'Scala']
def firstLetter = s ->
s[0]
assert languages.withCollectedKeys([C:'Clojure'], firstLetter) ==
[C:'Clojure', G:'Groovy', J:'Java', K:'Kotlin', S:'Scala']
This method is a convenience method for collectEntries(Iterable, Map, Function, Function)
with the valueTransform
replaced by Function.identity()
or {Closure.IDENTITY}.
values
- an Iterable that will become the added entry valuescollector
- the Map into which the transformed entries are putkeyTransform
- a function for transforming Iterator elements into keysTransform Iterable elements into Map entries with values unchanged and keys transformed using the supplied function.
def languages = ['Groovy', 'Java', 'Kotlin', 'Scala']
def firstLetter = s ->
s[0]
assert languages.withCollectedKeys(firstLetter) ==
[G:'Groovy', J:'Java', K:'Kotlin', S:'Scala']
This method is a convenience method for collectEntries(Iterable, Function, Function)
with the valueTransform
replaced by Function.identity()
or {Closure.IDENTITY}.
values
- an Iterable that will become the added entry valueskeyTransform
- a function for transforming Iterator elements into keysA variant of withCollectedValues for Iterators.
keys
- an Iteratorcollector
- the Map into which the transformed entries are putvalueTransform
- a function for transforming Iterator elements into valuesA variant of withCollectedValues for Iterators.
keys
- an IteratorvalueTransform
- a function for transforming Iterator elements into valuesTransform Iterable elements into Map entries with keys unchanged and values transformed using the supplied function. The supplied collector map is used as the destination for transformed entries.
def languages = ['Groovy', 'Java', 'Kotlin', 'Scala'] assert languages.withCollectedValues([Clojure:7], String::size) == [Clojure:7, Groovy:6, Java:4, Kotlin:6, Scala:5]This method is a convenience method for collectEntries(Iterable, Map, Function, Function) with the
keyTransform
replaced by Function.identity()
or {Closure.IDENTITY}.
keys
- an Iterablecollector
- the Map into which the transformed entries are putvalueTransform
- a function for transforming Iterable elements into valuesTransform Iterable elements into Map entries with keys unchanged and values transformed using the supplied function.
def languages = ['Groovy', 'Java', 'Kotlin', 'Scala'] assert languages.withCollectedValues(String::size) == [Groovy:6, Java:4, Kotlin:6, Scala:5]This method is a convenience method for collectEntries(Iterable, Function, Function) with the
keyTransform
replaced by Function.identity()
or {Closure.IDENTITY}.
keys
- an IterablevalueTransform
- a function for transforming Iterable elements into values Wraps a map using the decorator pattern with a wrapper that intercepts all calls
to get(key)
. If an unknown key is found, a default value will be
stored into the Map before being returned. The default value stored will be the
result of calling the supplied Closure with the key as the parameter to the Closure.
Example usage:
def map = [a:1, b:2].withDefault{ k->
k.toCharacter().isLowerCase() ? 10 : -10 } def expected = [a:1, b:2, c:10, D:-10] assert expected.every{ e->
e.value == map[e.key] } def constMap = [:].withDefault{ 42 } assert constMap.foo == 42 assert constMap.size() == 1
self
- a Mapinit
- a Closure which is passed the unknown key Wraps a map using the decorator pattern with a wrapper that intercepts all calls
to get(key)
and put(key, value)
.
If an unknown key is found for get
, a default value will be returned.
The default value will be the result of calling the supplied Closure with the key
as the parameter to the Closure.
If autoGrow
is set, the value will be stored into the map.
If autoShrink
is set, then an attempt to put
the default value
into the map is ignored and indeed any existing value would be removed.
If you wish the backing map to be as small as possible, consider setting autoGrow
to false
and autoShrink
to true
.
This keeps the backing map as small as possible, i.e. sparse, but also means that
containsKey
, keySet
, size
, and other methods
will only reflect the sparse values.
If you are wrapping an immutable map, you should set autoGrow
and autoShrink
to false
.
In this scenario, the get
method is essentially a shorthand
for calling getOrDefault
with the default value supplied once as a Closure.
Example usage:
// sparse map example def answers = [life: 100].withDefault(false, true){ 42 } assert answers.size() == 1 assert answers.foo == 42 assert answers.size() == 1 answers.life = 42 answers.putAll(universe: 42, everything: 42) assert answers.size() == 0 // immutable map example def certainties = [death: true, taxes: true].asImmutable().withDefault(false, false){ false } assert certainties.size() == 2 assert certainties.wealth == false assert certainties.size() == 2
self
- a MapautoGrow
- whether calling get could potentially grow the map if the key isn't foundautoShrink
- whether calling put with the default value could potentially shrink the mapinit
- a Closure which is passed the unknown key An alias for withLazyDefault
which decorates a list allowing
it to grow when called with index values outside the normal list bounds.
self
- a Listinit
- a Closure with the target index as parameter which generates the default value Decorates a list allowing it to grow when called with a non-existent index value.
When called with such values, the list is grown in size and a default value
is placed in the list by calling a supplied init
Closure. Null values
can be stored in the list.
How it works: The decorated list intercepts all calls
to getAt(index)
and get(index)
. If an index greater than
or equal to the current size()
is used, the list will grow automatically
up to the specified index. Gaps will be filled by calling the init
Closure.
If generating a default value is a costly operation consider using withLazyDefault
.
Example usage:
def list = [0, 1].withEagerDefault{ 42 }
assert list[0] == 0
assert list[1] == 1
assert list[3] == 42 // default value
assert list == [0, 1, 42, 42] // gap filled with default value
// illustrate using the index when generating default values
def list2 = [5].withEagerDefault{ index ->
index * index }
assert list2[3] == 9
assert list2 == [5, 1, 4, 9]
// illustrate what happens with null values
list2[2] = null
assert list2[2] == null
assert list2 == [5, 1, null, 9]
self
- a Listinit
- a Closure with the target index as parameter which generates the default valueZips an Iterable with indices in (value, index) order.
Example usage:
assert [["a", 0], ["b", 1]] == ["a", "b"].withIndex()
assert ["0: a", "1: b"] == ["a", "b"].withIndex().collect { str, idx ->
"$idx: $str" }
self
- an IterableZips an Iterable with indices in (value, index) order.
Example usage:
assert [["a", 5], ["b", 6]] == ["a", "b"].withIndex(5)
assert ["1: a", "2: b"] == ["a", "b"].withIndex(1).collect { str, idx ->
"$idx: $str" }
self
- an Iterableoffset
- an index to start fromZips an iterator with indices in (value, index) order.
Example usage:
assert [["a", 0], ["b", 1]] == ["a", "b"].iterator().withIndex().toList()
assert ["0: a", "1: b"] == ["a", "b"].iterator().withIndex().collect { str, idx ->
"$idx: $str" }.toList()
self
- an iteratorZips an iterator with indices in (value, index) order.
Example usage:
assert [["a", 5], ["b", 6]] == ["a", "b"].iterator().withIndex(5).toList()
assert ["1: a", "2: b"] == ["a", "b"].iterator().withIndex(1).collect { str, idx ->
"$idx: $str" }.toList()
self
- an iteratoroffset
- an index to start from Decorates a list allowing it to grow when called with a non-existent index value.
When called with such values, the list is grown in size and a default value
is placed in the list by calling a supplied init
Closure. Subsequent
retrieval operations if finding a null value in the list assume it was set
as null from an earlier growing operation and again call the init
Closure
to populate the retrieved value; consequently the list can't be used to store null values.
How it works: The decorated list intercepts all calls
to getAt(index)
and get(index)
. If an index greater than
or equal to the current size()
is used, the list will grow automatically
up to the specified index. Gaps will be filled by null
. If a default value
should also be used to fill gaps instead of null
, use withEagerDefault
.
If getAt(index)
or get(index)
are called and a null value
is found, it is assumed that the null value was a consequence of an earlier grow list
operation and the init
Closure is called to populate the value.
Example usage:
def list = [0, 1].withLazyDefault{ 42 }
assert list[0] == 0
assert list[1] == 1
assert list[3] == 42 // default value
assert list == [0, 1, null, 42] // gap filled with null
// illustrate using the index when generating default values
def list2 = [5].withLazyDefault{ index ->
index * index }
assert list2[3] == 9
assert list2 == [5, null, null, 9]
assert list2[2] == 4
assert list2 == [5, null, 4, 9]
// illustrate what happens with null values
list2[2] = null
assert list2[2] == 4
self
- a Listinit
- a Closure with the target index as parameter which generates the default valueA utility method for calling a method closure on an object.
self
- the objectmc
- the method closureDynamically wraps an instance into something which implements the supplied trait classes. It is guaranteed that the returned object will implement the trait interfaces, but the original type of the object is lost (replaced with a proxy).
self
- object to be wrappedtraits
- a list of trait classesBitwise XOR together two Numbers. Called when the '^' operator is used.
left
- a Numberright
- another Number to bitwise XORBitwise XOR together two BitSets. Called when the '^' operator is used between two bit sets.
left
- a BitSetright
- another BitSet to bitwise XORExclusive disjunction of two boolean operators
left
- left operatorright
- right operatorCreate a Set composed of the symmetric difference of a Set and an Iterable. Any elements that exit in only one are added to the resultant Set.
This operation will always create a new object for the result, while the operands remain unchanged.
def a = [1,2,3,4] as Set def b = [3,4,5,6] as Set assert (a ^ b) == [1,2,5,6] as SetBy default, Groovy uses a NumberAwareComparator when determining if an element exists in both sets.
left
- a Setright
- an IterableCreate a Set composed of the symmetric difference of a Set and an Iterable. Any elements that exit in only one are added to the resultant Set.
This operation will always create a new object for the result, while the operands remain unchanged.
assert [1,2,5,6] as Set == ([1,2,3,4] as Set).xor([3,4,5,6], Comparator.naturalOrder())
left
- a Setright
- an Iterablecomparator
- a ComparatorCreate a SortedSet composed of the symmetric difference of a SortedSet and an Iterable. Any elements that exist in only one of the sets are added to the resultant SortedSet.
This operation will always create a new object for the result, while the operands remain unchanged.
def a = [1,2,3,4] as SortedSet def b = [3,4,5,6] as Set assert (a ^ b) == [1,2,5,6] as SortedSetBy default, Groovy uses a NumberAwareComparator when determining if an element exists in both sets.
left
- a SortedSetright
- an IterableCreate a SortedSet composed of the symmetric difference of a SortedSet and an Iterable. Any elements that exit in only one are added to the resultant SortedSet.
This operation will always create a new object for the result, while the operands remain unchanged.
assert [1,2,5,6] as SortedSet == ([1,2,3,4] as SortedSet).xor([3,4,5,6], Comparator.naturalOrder())
left
- a SortedSetright
- an Iterablecomparator
- a ComparatorAn iterator of all the pairs of two Iterables.
def one = ['cat', 'spider'] def two = ['fish', 'monkey'] assert ['catfish', 'spidermonkey'] == one.zip(two).collect{ a, b -> a + b } assert [one, two].transpose() == one.zip(two).toList()
self
- an Iterableother
- another IterableAn iterator of all the pairs of two Iterators.
def small = [1, 2, 3].iterator() def large = [100, 200, 300].iterator() assert [101, 202, 303] == small.zip(large).collect{ a, b -> a + b } assert [small.toList(), large.toList()].transpose() == small.zip(large).toList()
self
- an Iteratorother
- another Iterator