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Added s.pull.lastOrError #1609

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Sep 10, 2019
Merged

Added s.pull.lastOrError #1609

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7 changes: 7 additions & 0 deletions core/shared/src/main/scala/fs2/Stream.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -3959,6 +3959,13 @@ object Stream extends StreamLowPriority {
go(None, self)
}

/** Returns the last element of the input, if non-empty, otherwise fails the pull with a `NoSuchElementException`. */
def lastOrError(implicit F: RaiseThrowable[F]): Pull[F, INothing, O] =
last.flatMap {
case None => Pull.raiseError(new NoSuchElementException)
case Some(o) => Pull.pure(o)
}

/** Like [[uncons]] but does not consume the chunk (i.e., the chunk is pushed back). */
def peek: Pull[F, INothing, Option[(Chunk[O], Stream[F, O])]] =
uncons.flatMap {
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