Re: Libraries Digest, Vol 117, Issue 10

IMNSHO, I think we should just add -- | @whenJust = 'for_'@. Executes the given action -- when @Just@, execute nothing if @Nothing@. whenJust :: Monad m => Maybe a -> (a -> m ()) -> m () whenJust = for_ to Data.Maybe. Even if it's duplicating a functionality, it's a good name that has been reinvented by many people. Its docs may mention for_ and teach the user that for_ is more generic etc. People looking for whenJust *will* look at Data.Maybe. We don't lose much by adding this function. On Fri, May 10, 2013 at 4:00 PM, Gwern Branwen wrote:

On Fri, May 10, 2013 at 2:54 PM, Chris Seaton wrote:

...

Perhaps we should have a dummy module in Hackage that includes commonly searched for functions, but instead of actually implementing them the documentation would say don't use this and suggest an alternative and explains why. Then you could find them in Hoogle and Hackage seems to be highly ranked on Google so they'd be found there as well.

Or expand hlint to catch whenJust like constructs and suggest use of the alternative? We already did that for when 'void' was added, put in a suggestion looking for things like '>> return ()'

-- gwern http://www.gwern.net

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-- Felipe.