On Sun, May 30, 2010 at 11:35 AM, Michael Vanier <mvanie...@gmail.com>wrote:
> 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-Monad.html#v%3AliftM2 <file:///usr/share/doc/ghc6-doc/html/libraries/base-4.2.0.0/Control-Monad.html#v%3AliftM2>Strangely, Hayoo didn't turn this one up... anyone know why? Michael
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