18 Oct
2009
18 Oct
'09
4:51 p.m.
Am Sonntag 18 Oktober 2009 18:40:48 schrieb Robert Ziemba:
On Sun, Oct 18, 2009 at 8:01 AM, Alexander Dunlap <
alexander.dunlap@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?
Almost. It should be fileLines str = readFile str >>= return . length . lines (or return . length . lines =<< readFile str or fmap (length . lines) (readFile str) or...)