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Add ZIO#tapEither and tests #5105

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Merged
merged 3 commits into from
May 17, 2021
Merged

Add ZIO#tapEither and tests #5105

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89f3921
Add ZIO#tapEither and tests
mingyuchi May 17, 2021
105b23f
clean test
mingyuchi May 17, 2021
1d0bc6a
remove extra brace in the doc
mingyuchi May 17, 2021
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24 changes: 24 additions & 0 deletions core-tests/shared/src/test/scala/zio/ZIOSpec.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -3158,6 +3158,30 @@ object ZIOSpec extends ZIOBaseSpec {
assert(effect)(equalTo(42))
}
),
suite("tapEither")(
testM("effectually peeks at the failure of this effect") {
for {
ref <- Ref.make(0)
_ <- IO.fail(42)
.tapEither {
case Left(value) => ref.set(value)
case Right(_) => ref.set(-1)
}
.run
effect <- ref.get
} yield assert(effect)(equalTo(42))
},
testM("effectually peeks at the success of this effect") {
for {
ref <- Ref.make(0)
_ <- Task(42).tapEither {
case Left(_) => ref.set(-1)
case Right(value) => ref.set(value)
}.run
effect <- ref.get
} yield assert(effect)(equalTo(42))
}
),
suite("tapCause")(
testM("effectually peeks at the cause of the failure of this effect") {
for {
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11 changes: 11 additions & 0 deletions core/shared/src/main/scala/zio/ZIO.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -1870,6 +1870,17 @@ sealed trait ZIO[-R, +E, +A] extends Serializable with ZIOPlatformSpecific[R, E,
): ZIO[R1, E1, A] =
self.foldCauseM(new ZIO.TapErrorRefailFn(f), new ZIO.TapFn(g))

/**
* Returns an effect that effectfully "peeks" at the result of this effect.
* {{{
* readFile("data.json").tapEither(result => log(result.fold("Error: " + _, "Success: " + _)))
* }}}
*/
final def tapEither[R1 <: R, E1 >: E](f: Either[E, A] => ZIO[R1, E1, Any])(implicit
ev: CanFail[E]
): ZIO[R1, E1, A] =
self.foldCauseM(new ZIO.TapErrorRefailFn(e => f(Left(e))), new ZIO.TapFn(a => f(Right(a))))

/**
* Returns an effect that effectually "peeks" at the cause of the failure of
* this effect.
Expand Down