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Add an overload of FlatMapOps#>> that gives control on the evaluation… #492

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Sep 9, 2015
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Add an overload of FlatMapOps#>> that gives control on the evaluation… #492

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19 changes: 18 additions & 1 deletion core/src/main/scala/cats/syntax/flatMap.scala
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Expand Up @@ -21,7 +21,24 @@ class FlatMapOps[F[_], A](fa: F[A])(implicit F: FlatMap[F]) {
def flatMap[B](f: A => F[B]): F[B] = F.flatMap(fa)(f)
def mproduct[B](f: A => F[B]): F[(A, B)] = F.mproduct(fa)(f)
def >>=[B](f: A => F[B]): F[B] = F.flatMap(fa)(f)
def >>[B](fb: F[B]): F[B] = F.flatMap(fa)(_ => fb)

/** Alias for [[followedBy]]. */
@inline final def >> [B](fb: F[B]): F[B] = followedBy(fb)

/** Sequentially compose two actions, discarding any value produced by the first. */
def followedBy[B](fb: F[B]): F[B] = F.flatMap(fa)(_ => fb)

/**
* Sequentially compose two actions, discarding any value produced by the first. This variant of
* [[followedBy]] also lets you define the evaluation strategy of the second action. For instance
* you can evaluate it only ''after'' the first action has finished:
*
* {{{
* fa.followedByEval(later(fb))
* }}}
*/
def followedByEval[B](fb: Eval[F[B]]): F[B] = F.flatMap(fa)(_ => fb.value)

}

class FlattenOps[F[_], A](ffa: F[F[A]])(implicit F: FlatMap[F]) {
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