On Sun, 02 Apr 2006, "Jared Updike" <[EMAIL PROTECTED]> wrote:
> Something like "distribute fst (==)" where > >> distribute f op x y = f x `op` f y A function like this has been suggested for the standard libraries a couple of times before. Someone suggested the name "on", which I quite like: (*) `on` f = \x y -> f x * f y >> unionBy (distribute fst (==)) listOfPairs1 listOfPairs2 unionBy ((==) `on` fst) xs ys I think on makes the code rather readable: union by equality on first. -- /NAD _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
