Re: [Haskell-beginners] Reversing the lines read from stdin

Am Donnerstag 28 Januar 2010 21:44:04 schrieb Tim Perry:

I wrote a simple program: it reads the contents from standard in and reverses the order of the lines. I imagine there are many cleaner ways to do this. Anybody willing to post some rewrites?

Thanks, Tim

main = interact reverseFile reverseFile s = unlines $ lines $ foldr combineStr [] (lines s) combineStr s1 s2 = s2 ++ "\n" ++ s1

main = interact (unlines . reverse . lines) perhaps?