8000 Optimize `ZIO::flatMapError` encoding by guizmaii · Pull Request #9585 · zio/zio · GitHub
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Optimize ZIO::flatMapError encoding #9585

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merged 1 commit into from
Feb 13, 2025
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Optimize ZIO::flatMapError encoding #9585

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5 changes: 4 additions & 1 deletion core/shared/src/main/scala/zio/ZIO.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -656,7 +656,10 @@ sealed trait ZIO[-R, +E, +A]
final def flatMapError[R1 <: R, E2](
f: E => URIO[R1, E2]
)(implicit ev: CanFail[E], trace: Trace): ZIO[R1, E2, A] =
flipWith(_ flatMap f)
self.foldZIO(
success = ZIO.successFn,
failure = f(_).flip
)

/**
* Returns an effect that performs the outer effect first, followed by the
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