[Haskell-cafe] name of this monadic combinator?

[Michael Vanier]

On 5/30/10 1:40 AM, Michael Snoyman wrote:
>
>
> On Sun, May 30, 2010 at 11:35 AM, Michael Vanier <mvanier42 at gmail.com 
> <mailto:mvanier42 at 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
>
> Strangely, Hayoo didn't turn this one up... anyone know why?
>
> Michael
Ah, cool.  Thanks!

- Mike