On Thu, 1 Dec 2005, raptor wrote:
Whats wrong with following code :
module Main where
main = putStrLn "hi"
parse str = take 10 str
load = do content <- readFile "parse.hs" return content
Nothing! It works, output is "hi". "load" isn't used, but its type would be "load :: IO String", so if you want to use it: main = do content <- load putStrLn (show content)
i tried different combinations, but still cant figure out... How do u use an "IO String" in normal "String" functions.. I want to particulary slurp file in a string and then make funny things with it...spliting to lines,parsing them and building hash like strucutre of it...etc.
Well, "main" is an example, and actually "load" is another example - you don't really do much with your value in "load", but you would find that the value has type String there. The catch is that of course you must use this notation (<-), and whatever "load" returns will be IO something. But you can use that in main, etc. This may not make much sense without a little more exposure to the underlying principles, but if you're just trying different combinations, it should give you some ideas. By the way, in your style of writing, does "..." end a sentence, or should that be interpreted in some other way? Donn Cave, donn@drizzle.com