2009/8/18 Dusan Kolar <ko...@fit.vutbr.cz>: > Hello all, > > During a small project I'm trying to develop a small application. It > becomes quite often that I need a function mapapp: > > mapapp _ [] ap = ap > mapapp f (a:as) ap = f a : map f as ap > > I tried hoogle to find such a function with no success. Is there any > function/functions built-in "standard" libraries that could easily satisfy > the functionality with the same or even better (?) efficiency?
Can't think of something like that either but at least we can make it shorter and less readable ;) mapapp f xs tail = foldr ((:) . f) tail xs > Of course, > (map f list) ++ append > would do the same as > > mapapp f list append > > but with less efficiency. Or am I wrong? Yes, that is less efficient because ++ has to create N new cons cells if "list" has length N. -- Fruhwirth Clemens http://clemens.endorphin.org _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
