Re: [Haskell-cafe] A beginners question

2008/2/23, Harri Kiiskinen :

Dear All,

banging my head against Haskell, but liking the feeling of hurting brains. Just a simple question:

If

fmap (^4) [1,2,3] >>= \i -> shows i " "

gives

"1 16 81 "

In the List Monad, (>>=) is defined as concatMap, so this code can be translated by :

concatMap (\i -> shows i " ") (fmap (^4) [1,2,3])

shows is applied to each elements of the list, then the strings are concatened. Whereas in

let xs = fmap (^4) [1,2,3] in shows xs " " shows is applied to the whole list.

-- Jedaï