gistfile1.scala

val m: Map[Int, Either[Int, String]] = ...
val rights = m.collect { case (k, Right(v)) => k -> v }
val lefts = m.collect { case (k, Left(v)) => k -> v }

val m: Map[Int, Int \/ String] = ...
val rights = m.collect { case (k, v) if v.isRight => k -> v.toOption.get }
val lefts = m.collect { case (k, v) if v.isLeft => k -> v.swap.toOption.get }


val n: ValidationNEL[String, Int] = ...
n match {
  case Success(n) if n > 0 => ...
  case Success(_) => ...
  case Failure(err) => ...
}

n fold (
  err => ...,
  n => if (n > 0) ... else ...
)