Re: Proposal: add Control.Monad.whenJust ∷ (Monad m) ⇒ Maybe α→(α→ m ()) → m ()

On 11/30/2011 11:26 PM, Evan Laforge wrote:

On Tue, Nov 29, 2011 at 11:11 PM, Liyang HU<haskell.org@liyang.hu> wrote:

...

This particular pattern crops up a lot for me. Does it for anyone else?

Yep, I have that in my personal library, and use it fairly often.

I prefer it to Foldable.forM_ because it's explicit about the type it takes, forM_ sounds too much like a loop. Well, it is a loop over collection, which in the case of Maybe can contain at most one element.