>>I'm trying to write a function that combines folding and mapping a map is a fold:)
idList = foldr (:) [] map f = foldr ((:) . f) [] > foldmap :: (b -> b -> b) -> (a -> b) -> [a] -> b > foldmap f m = foldr1 f . map m alternatively, and dealing with empty lists as well foldmap op n f = foldr (op . f) n cheers, claus _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
