OptionalIterableExtension<T> extension

Extensions that apply to all iterables.

on

Properties

firstOptional → Optional<T>
The first element, or Optional.empty() if the iterable is empty.
no setter
lastOptional → Optional<T>
The last element, or Optional.empty() if the iterable is empty.
no setter
singleOptional → Optional<T>
The single element of the iterable, or Optional.empty().
no setter

Methods

firstWhereIndexedOptional(bool test(int index, T element)) → Optional<T>
The first element whose value and index satisfies test.
firstWhereOptional(bool test(T element)) → Optional<T>
The first element satisfying test, or Optional.empty() if there are none.
lastWhereIndexedOptional(bool test(int index, T element)) → Optional<T>
The last element whose index and value satisfies test.
lastWhereOptional(bool test(T element)) → Optional<T>
The last element satisfying test, or Optional.empty() if there are none.
singleWhereIndexedOptional(bool test(int index, T element)) → Optional<T>
The single element satisfying test.
singleWhereOptional(bool test(T element)) → Optional<T>
The single element satisfying test.