On Sun, May 30, 2010 at 11:35 AM, Michael Vanier
I stumbled across this monadic combinator:
mcombine :: Monad m => (a -> a -> a) -> m a -> m a -> m a mcombine f mx my = do x <- mx y <- my return (f x y)
I used it to chain the outputs of two Parsec String parsers together using this operator:
(<++>) :: Monad m => m String -> m String -> m String (<++>) = mcombine (++)
mcombine seems like such a basic operation that it should be a library function, but I couldn't find one matching it on hoogle. Is there one?
- Mike
liftM2: http://hackage.haskell.org/packages/archive/base/4.2.0.1/doc/html/Control-Mo...
file:///usr/share/doc/ghc6-doc/html/libraries/base-4.2.0.0/Control-Monad.htm...Strangely, Hayoo didn't turn this one up... anyone know why? Michael