mancvso
/ WhenUnlessOtherwise.scala
Last active
December 14, 2015 20:58
— forked from joa/gist:5141649
when / unless / otherwise implementation in Scala with some Implicit Value Classes and call by name (deferred evaluation only when necessary).
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| // --- Shorter with Option[T] --- // | |
| implicit class WhenUnless[T](x: => T) { | |
| lazy val xx = x | |
| def when(cond: => Boolean):Option[T] = if(cond) Some(xx) else None | |
| def unless(cond: => Boolean):Option[T] = if(cond) None else Some(xx) | |
| } | |
| implicit class Otherwise[+T](val x: Option[T]) extends AnyVal { | |
| def otherwise[S >: T](z: => S):S = if(x.isDefined) x.get else z //could not use getOrElse |