On Sat, Feb 16, 2008 at 05:04:53PM -0800, Donn Cave wrote:
But in Haskell, you cannot read a file line by line without writing an exception handler, because end of file is an exception! as if a file does not normally have an end where the authors of these library functions came from?
Part of it is that using 'getLine' is not idiomatic haskell when you don't want to worry about exceptions. Generally you do something like doMyThing xs = print (length xs) main = do contents <- readFile "my.file" mapM_ doMyThing (lines contents) which will call 'doMyThing' on each line of the file, in this case printing the length of each line. or more succinctly: main = readFile "my.file" >>= mapM_ doMyThing . lines John -- John Meacham - ⑆repetae.net⑆john⑈