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

[Mikhail Vorozhtsov]

On 11/30/2011 11:26 PM, Evan Laforge wrote:
> On Tue, Nov 29, 2011 at 11:11 PM, Liyang HU<haskell.org at 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.