[Haskell-cafe] On to applicative

michael rice nowgate at yahoo.com
Sat Sep 4 14:06:54 EDT 2010


The two myAction functions below seem to be equivalent and, for this small case, show an interesting economy of code, but being far from a Haskell expert, I have to ask, is the first function as small (code wise) as it could be?

Michael


import Control.Applicative

data Color
    = Red
    | Blue
    | Green
    | Yellow
    | Orange
    | Brown
    | Black
    | White
    deriving (Show, Read, Eq, Enum, Ord, Bounded)

-- myAction :: IO Color
-- myAction = getLine
--            >>= \str -> return (read str :: Color)

myAction :: IO Color
myAction = read <$> getLine




      
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