[Haskell-beginners] parsec question

[David Virebayre]

On Mon, Jul 19, 2010 at 9:41 AM, Michael Mossey <mpm at alumni.caltech.edu> wrote:
> digitList :: Parser [Int]
> digitList = do d <- digit
>               remainder <- digitList
>               return $ read [d] : remainder
>            <|>
>            return []

I would write


digitList :: Parser [Int]
digitList = do
  l <- many digit
  let l' = map ( read    -- read the string
               . (: [])  -- convert the digit from a char to a string
so I can "read" it
               ) l
  return l'


That can be shortened to :

digitList :: Parser [Int]
digitList = map ( read.(:[])) `fmap` many digit

David.