| Return type | Name and parameters |
|---|---|
OptionalDouble
|
filter(DoublePredicate test)
If a value is present in the OptionalDouble, tests the value using
the given predicate and returns the optional if the test returns true or
empty otherwise.
|
double
|
get()
If a value is present in the OptionalDouble, returns the value.
|
Optional
|
mapToObj(DoubleFunction mapper)
If a value is present in the OptionalDouble, returns an Optional
consisting of the result of applying the given function to the value or else empty.
|
OptionalDouble
|
peek(DoubleConsumer action)
If a value is present in the OptionalDouble, executes the specified
action with the value as input and then returns self.
|
DoubleStream
|
stream()
If a value is present in the OptionalDouble, returns a DoubleStream with the value as its source or else an empty stream. |
addShutdownHook, any, any, asBoolean, asType, collect, collect, collect, dump, each, eachMatch, eachMatch, eachWithIndex, every, every, find, find, findAll, findAll, findIndexOf, findIndexOf, findIndexValues, findIndexValues, findLastIndexOf, findLastIndexOf, findResult, findResult, findResult, findResult, getAt, getMetaClass, getMetaPropertyValues, getProperties, grep, grep, hasProperty, identity, inject, inject, inspect, invokeMethod, is, isCase, isNotCase, iterator, metaClass, print, print, printf, printf, println, println, println, putAt, respondsTo, respondsTo, setMetaClass, split, sprintf, sprintf, stream, tap, toString, use, use, use, with, with, withCloseable, withMethodClosure, withStream, withTraits
If a value is present in the OptionalDouble, tests the value using
the given predicate and returns the optional if the test returns true or
empty otherwise.
assert !OptionalDouble.empty().filter(n -> true).isPresent() assert OptionalDouble.of(Math.PI).filter(n -> true).isPresent() assert !OptionalDouble.of(Math.PI).filter(n -> false).isPresent() assert OptionalDouble.of(Math.PI).filter(n -> true).getAsDouble() == Math.PI
If a value is present in the OptionalDouble, returns the value.
assert OptionalDouble.of(Math.PI).get() == Math.PI
If a value is present in the OptionalDouble, returns an Optional
consisting of the result of applying the given function to the value or else empty.
assert !OptionalDouble.empty().mapToObj(x -> new Object()).isPresent()
assert OptionalDouble.of(Math.PI).mapToObj(x -> new Object()).isPresent()
assert !OptionalDouble.of(Math.PI).mapToObj(x -> null).isPresent()
assert OptionalDouble.of(Math.PI).mapToObj(Double::toString).get().startsWith('3.14')
If a value is present in the OptionalDouble, executes the specified
action with the value as input and then returns self.
boolean called = false
def opt = OptionalDouble.empty()
def out = opt.peek{ called = true }
assert out === opt
assert !called
opt = OptionalDouble.of(Math.PI)
out = opt.peek{ assert it == Math.PI; called = true }
assert out === opt
assert called
If a value is present in the OptionalDouble, returns a DoubleStream with the value as its source or else an empty stream.