On Tue, Dec 12, 2006 at 11:29:11AM -0500, Louis J Scoras wrote: > Which didn't work. I thought about it a little more before realizing > that putDirs wouldn't get any parameters this way: I needed some way > to distribute the pair over both operations. Here's the higher-order > function I needed: > > foo h f g i = h (f i) (g i)
foo is a special case of Control.Monad.liftM2. > import Control.Monad > import Control.Monad.liftM2 > mapM_ (liftM2 (>>) print print) [2,3,4,5] 2 2 3 3 4 4 5 5 (This is using the Monad ((->) a) instance) HTH, Stefan _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
