[Haskell] Types of when and unless in Control.Monad
lemming at henning-thielemann.de
Mon Jun 4 21:27:30 CEST 2012
On Mon, 4 Jun 2012, Henning Thielemann wrote:
> On Mon, 4 Jun 2012, Andreas Abel wrote:
>> Concerning the suggestion that when_ would be in sync with forM_ and whenM_
>> I'd say: not really. forM_ and whenM_ discard the result of the monadic
>> computation, while when and when_ do not even have such a result. They
>> always just perform some monadic effect and return nothing.
> What is whenM_ ? Do you mean mapM_ ?
Ah, I think whenM_ was this one
whenM_ :: m Bool -> m a -> m ()
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