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