On Thu, Apr 24, 2008 at 11:28 PM, Ben <[EMAIL PROTECTED]> wrote: > 2) Is there a reason to not use mapM3 above?
Yes, there certainly is. mapM3 is not equivalent to mapM; it is too strict: *Main> take 3 $ head $ mapM return [1,2,3,4,undefined] [1,2,3] *Main> take 3 $ head $ mapM3 return [1,2,3,4,undefined] [*** Exception: Prelude.undefined So, like foldl', mapM3 seems a viable alternative for mapM, but not a replacement. Luke _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
