01.Answer

answerkey/streamingio/01.answer.md

latest332 B

scala

def fromListViaUnfold[O](os: List[O]): Pull[O, Unit] =
  unfold(os):
    case Nil => Left(Nil)
    case hd :: tl => Right((hd, tl))
  .map(_ => ())

def fromLazyListViaUnfold[O](os: LazyList[O]): Pull[O, Unit] =
  unfold(os):
    case LazyList() => Left(LazyList())
    case hd #:: tl => Right((hd, tl))
  .map(_ => ())