[Haskell-beginners] count function

[Robert Ziemba]

On Sun, Oct 18, 2009 at 8:01 AM, Alexander Dunlap <
alexander.dunlap at gmail.com> wrote:

>
>
> The way I would count all of the lines in a file is (untested)
>
> fCountLines :: String -> IO Int
> fCountLines = length . lines . readFile
>
>
I'm not sure if I did something wrong, but I could not get this to work
because 'readFile' returns an IO String.  I tried the following and it
worked.

 fileLines str = readFile str >>= return . lines >>= return . length

Is this a reasonable way to count lines?
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