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Either partition
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| @tailrec def partition[A, B](in: List[Either[A, B]], out: (List[A], List[B]) = (Nil, Nil)): (List[A], List[B]) = in match { | |
| case Nil => out | |
| case Left(a) :: tail => partition(tail, (a :: out._1, out._2)) | |
| case Right(b) :: tail => partition(tail, (out._1, b :: out._2)) | |
| } |
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