| 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,
otherwise throws NoSuchElementException.
|
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.
|
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, average, collect, collect, collect, contains, count, dump, each, eachWithIndex, equals, every, every, find, find, findAll, findAll, findIndexOf, findIndexOf, findIndexValues, findIndexValues, findLastIndexOf, findLastIndexOf, findResult, findResult, flatten, getAt, getMetaClass, getMetaPropertyValues, getProperties, grep, grep, groupBy, groupBy, hasProperty, identity, inject, inject, inspect, invokeMethod, is, isCase, iterator, join, metaClass, print, print, printf, printf, println, println, println, putAt, respondsTo, respondsTo, setMetaClass, size, split, sprintf, sprintf, stream, sum, sum, tap, toArrayString, toSpreadMap, toString, use, use, use, with, with, 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,
otherwise throws NoSuchElementException.
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, returns a DoubleStream with the value as its source or else an empty stream.