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
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