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chris-martin/bitraverse.scala

Created September 21, 2016 15:39
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bitraverse.scala
import scalaz._, Scalaz._
def f[A, B](xs: List[Either[List[A], B]]): List[Either[A, B]] =
xs.flatMap(_.fold(_.map(Left(_)), b => List(Right(b))))
def g[A, B](xs: IList[IList[A] \/ B]): IList[A \/ B] =
xs.flatMap(_.bitraverse(identity, IList(_)))
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