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Optimize ZStream::flatMap #8261

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merged 1 commit into from
Jul 16, 2023
Merged

Optimize ZStream::flatMap #8261

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8 changes: 7 additions & 1 deletion streams/shared/src/main/scala/zio/stream/ZStream.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1321,7 +1321,13 @@ final class ZStream[-R, +E, +A] private (val channel: ZChannel[R, Any, Any, Any,
def flatMap[R1 <: R, E1 >: E, B](f: A => ZStream[R1, E1, B])(implicit
trace: Trace
): ZStream[R1, E1, B] =
new ZStream(channel.concatMap(as => as.map(f).map(_.channel).fold(ZChannel.unit)(_ *> _)))
new ZStream(
channel.concatMap(as =>
as.foldLeft[ZChannel[R1, Any, Any, Any, E1, zio.Chunk[B], Any]](ZChannel.unit) { case (acc, a) =>
acc *> f(a).channel
}
)
)

/**
* Maps each element of this stream to another stream and returns the
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