Haskell: Parsing command line arguments

Question

This more of a style question, rather than a how to.

So I\'ve got a program that needs two command line arguments: a string and an integer.

I implemented it this

Answer 1

There are plenty of argument/option parsing libraries in Haskell that make life easier than with read/getOpt, an example with a modern one (optparse-applicative) might be of interest:

import Options.Applicative

doStuffWith :: String -> Int -> IO ()
doStuffWith s n = mapM_ putStrLn $ replicate n s

parser = fmap (,)
         (argument str (metavar "")) <*>
         (argument auto (metavar ""))

main = execParser (info parser fullDesc) >>= (uncurry doStuffWith)