[Haskell-cafe] map applications

I have a simple list like this: qlist = ["ll", "kkkkkkk", "ddddd"] Why is it OK to do this: qwrap [] = putStrLn ":" qwrap (a:as) = do putStrLn a qwrap as qwap qlist but not this: map putStrLn qlist What is going on in the map function? McQueen