Sink.headOption

Materializes into a Future[Option[T]] CompletionStage<Optional<T>> which completes with the first value arriving wrapped in Some Optional, or a None an empty Optional if the stream completes without any elements emitted.

Sink stages

Signature

def headOption[T]: Sink[T, Future[Option[T]]]

Description

Materializes into a Future[Option[T]] CompletionStage<Optional<T>> which completes with the first value arriving wrapped in Some Optional, or a None an empty Optional if the stream completes without any elements emitted.

cancels after receiving one element

backpressures never

Found an error in this documentation? The source code for this page can be found here. Please feel free to edit and contribute a pull request.