+1, I‘ve often wanted this but don’t want to add a dependency just for bool,
so I end up writing it myself, locally in a where every time, which doesn't
feel very Haskelly to do!
I would even like it in Prelude, but I expect that to get much more
opposition so this proposal should probably not discuss that possibility at
all.
On Wed, Sep 11, 2013 at 12:02 AM, Oliver Charles
Hello,
I would like to propose that the following is added to Data.Bool in base:
bool :: a -> a -> Bool -> a bool f _ False = f bool _ t True = t
(Aka, bool f t b = if b then t else f)
The purpose of this is hopefully evident from its definition. I find myself reaching for this in cases similar to where I would use 'maybe' - often when I'm working with 'fmap' and don't want to start introducing names for the function I am using to map over some functor.
I suggested this in #haskell and other people also seem frustrated this doesn't exist, and would like to see it happen - hopefully they will voice their support as a reply here.
A quick search on FPComplete's Hoogle [1] shows five equivalent functions on the first page - and I'm sure there are more on subsequent pages.
Thoughts? - ocharles
--- [1]:
https://www.fpcomplete.com/hoogle?q=Bool+-%3E+a+-%3E+a+-%3E+a&env=ghc-7.4.2-stable-13.09
_______________________________________________ Libraries mailing list Libraries@haskell.org http://www.haskell.org/mailman/listinfo/libraries