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@malcolmgreaves

malcolmgreaves/ChainSideEffect.scala

Created April 10, 2016 20:12
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Adds a convenient method to perform a side effect and evaluate to the (originally called) value.
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ChainSideEffect.scala
implicit class ChainSideEffect[T](private val x: T) extends AnyVal {
@inline def sideEffect(op: () => Unit): T = {
val _: Unit = op()
x
}
}
@malcolmgreaves
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malcolmgreaves commented Apr 10, 2016

I wrote this implicit class + method to solve a problem I had earlier today. My code looked like the following:

for {
  ...
  (closeableThing, x, y, z) <- someCoolFunction(...)
  ...
} yield MakeThisObject(
    field1 = ...,
    ...,
    fieldK = ...
  // handy! =D
  ).sideEffect(() => closeableThing.close())

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