Hi again,

Given the following code:

g :: IO String -> IO String

f :: [IO String] -> IO [ String ]
f = mapM g

The implementation of f is wrong because I would like to:

1. Make f behave lazy

Its input list is made of lines read from stdin and I want it to process lines one by one as they are entered by the user.

2. Implement  f such that it stops consuming items from the input list when the input item meets some condition. For example:
isExit item = ("exit" == item)

I tried to implement my own custom iteration by recursion but I got stuck in the combination of IO and list monads.

Any help is appreciated.

Thanks!