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