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2013-10-21T04:23:22.483
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2017-05-23T12:22:14.813
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There is a method: <code>separate</code> <a href="https://github.com/scalaz/scalaz/blob/scalaz-seven/core/src/main/scala/scalaz/MonadPlus.scala#L24" rel="nofollow noreferrer">defined</a> in MonadPlus. This typeclass is a combination a Monad with PlusEmpty (generalized Monoid). So you need to define instance for <code>Seq</code>: 1) MonadPlus[Seq] <pre><code>implicit val seqmp = new MonadPlus[Seq] { def plus[A](a: Seq[A], b: => Seq[A]): Seq[A] = a ++ b def empty[A]: Seq[A] = Seq.empty[A] def point[A](a: => A): Seq[A] = Seq(a) def bind[A, B](fa: Seq[A])(f: (A) => Seq[B]): Seq[B] = fa.flatMap(f) } </code></pre> Seq is already monadic, so <code>point</code> and <code>bind</code> are easy, <code>empty</code> and <code>plus</code> are monoid operations and <code>Seq</code> is a <a href="http://blog.higher-order.com/blog/2013/08/20/free-monads-and-free-monoids/" rel="nofollow noreferrer">free monoid</a> 2) Bifoldable[\/] <pre><code>implicit val bife = new Bifoldable[\/] { def bifoldMap[A, B, M](fa: \/[A, B])(f: (A) => M)(g: (B) => M)(implicit F: Monoid[M]): M = fa match { case \/-(r) => g(r) case -\/(l) => f(l) } def bifoldRight[A, B, C](fa: \/[A, B], z: => C)(f: (A, => C) => C)(g: (B, => C) => C): C = fa match { case \/-(r) => g(r, z) case -\/(l) => f(l, z) } } </code></pre> Also easy, standard folding, but for type constructors with two parameters. Now you can use separate: <pre><code>val seq: Seq[String \/ Int] = List(\/-(10), -\/("wrong"), \/-(22), \/-(1), -\/("exception")) scala> seq.separate res2: (Seq[String], Seq[Int]) = (List(wrong, number exception),List(10, 22, 1)) </code></pre> Update Thanks to <a href="https://stackoverflow.com/users/605582/kenji-yoshida">Kenji Yoshida</a>, there <a href="https://github.com/scalaz/scalaz/blob/v7.1.0-M3/core/src/main/scala/scalaz/Either.scala#L373" rel="nofollow noreferrer">is</a> a Bitraverse[\/], so you need only MonadPlus. And a simple solution using <code>foldLeft</code>: <pre><code>seq.foldLeft((Seq.empty[String], Seq.empty[Int])){ case ((as, ai), either) => either match { case \/-(r) => (as, ai :+ r) case -\/(l) => (as :+ l, ai) } } </code></pre>
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