独習 Scalaz — Validation

Validation Scalaz のデータ構造で Either と比較されるものにもう1つ Validation がある: sealed trait Validation[+E, +A] { /** Return `true` if this validation is success. */ def isSuccess: Boolean = this match { case Success(_) => true case Failure(_) => false } /** Return `true` if this validation is failure. */ def isFailure: Boolean = !isSuccess ... } final case class Success[E, A](a: A) extends Validation[E, A] final

[gomi_ningen]

fp in scala の error handlings の章末の問題の解説に出てきた