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Add Monad#{when,unless}M #4756

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Add Monad#{when,unless}M #4756

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6 changes: 6 additions & 0 deletions core/src/main/scala/cats/Monad.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -162,6 +162,12 @@ trait Monad[F[_]] extends FlatMap[F] with Applicative[F] {
tailRecM(branches.toList)(step)
}

def whenM[A](cond: F[Boolean])(f: => F[A]): F[Unit] =
ifM(cond)(ifTrue = void(f), ifFalse = unit)

def unlessM[A](cond: F[Boolean])(f: => F[A]): F[Unit] =
ifM(cond)(ifTrue = unit, ifFalse = void(f))

/**
* Modifies the `A` value in `F[A]` with the supplied function, if the function is defined for the value.
* Example:
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