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yoshiyoshifujii/either_swap.scala

Last active March 10, 2017 06:36
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either_swap.scala
def swap[L, R](a: Option[Either[L, R]]): Either[L, Option[R]] =
(for {
b <- a
} yield for {
c <- b.right
} yield Option(c)).getOrElse(Right(None))
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