public class GroovyCollections extends Object
A Collections utility class
| Type Params | Return Type | Name and description |
|---|---|---|
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public static List |
combinations(Object[] collections)Finds all combinations of items from the given collections. |
|
public static List |
combinations(Collection collections)
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public static List |
combinations(Iterable collections)Finds all combinations of items from the given Iterable aggregate of collections. |
<T> |
public static List<List<T>> |
inits(Iterable<T> collections) |
<T> |
public static T |
max(T[] items)Selects the maximum value found in an array of items, so max([2, 4, 6] as Object[]) == 6. |
<T> |
public static T |
max(Collection<T> items)
|
<T> |
public static T |
max(Iterable<T> items)Selects the maximum value found in an Iterable. |
<T> |
public static T |
min(T[] items)Selects the minimum value found in an array of items, so min([2, 4, 6] as Object[]) == 2. |
<T> |
public static T |
min(Collection<T> items)
|
<T> |
public static T |
min(Iterable<T> items)Selects the minimum value found in an Iterable of items. |
<T> |
public static Set<List<T>> |
subsequences(List<T> items)Finds all non-null subsequences of a list. |
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public static Object |
sum(Object[] items)Sums all the items from an array of items. |
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public static Object |
sum(Collection items)
|
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public static Object |
sum(Iterable<?> items)Sums all the given items. |
<T> |
public static List<List<T>> |
tails(Iterable<T> collections) |
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public static List |
transpose(Object[] lists)Transposes an array of lists. |
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public static List |
transpose(List lists)Transposes the given lists. |
Finds all combinations of items from the given collections.
collections - the given collectionscollections - the given collections Finds all combinations of items from the given Iterable aggregate of collections.
So, combinations([[true, false], [true, false]])
is [[true, true], [false, true], [true, false], [false, false]]
and combinations([['a', 'b'],[1, 2, 3]])
is [['a', 1], ['b', 1], ['a', 2], ['b', 2], ['a', 3], ['b', 3]].
If a non-collection item is given, it is treated as a singleton collection,
i.e. combinations([[1, 2], 'x']) is [[1, 'x'], [2, 'x']].
If an empty collection is found within the given collections, the result will be an empty list.
collections - the Iterable of given collectionsSelects the maximum value found in an array of items, so max([2, 4, 6] as Object[]) == 6.
items - an array of itemsSelects the maximum value found in an Iterable.
items - a CollectionSelects the minimum value found in an array of items, so min([2, 4, 6] as Object[]) == 2.
items - an array of itemsSelects the minimum value found in an Iterable of items.
items - an Iterable Finds all non-null subsequences of a list.
E.g. subsequences([1, 2, 3]) would be:
[[1, 2, 3], [1, 3], [2, 3], [1, 2], [1], [2], [3]]
items - the List of itemsSums all the items from an array of items.
items - an array of itemsSums all the given items.
items - an Iterable of itemsTransposes an array of lists.
lists - the given lists