Hello michael, Sunday, August 8, 2010, 5:36:05 PM, you wrote:
i highly recommend you to read http://sigfpe.blogspot.com/2006/08/you-could-have-invented-monads-and.html that is the best introduction into monads i know and then http://haskell.org/all_about_monads/html/index.html - comprehensive tutorial about many useful monads both are mentioned at http://en.wikipedia.org/wiki/Monad_%28functional_programming%29 > What is <- ? Couldn't find anything on Hoogle. > 1) main = do > x <- getLine -- get the value from the IO monad > putStrLn $ "You typed: " ++ x > 2) pythags = do > z <- [1..] --get the value from the List monad? > x <- [1..z] > y <- [x..z] > guard (x^2 + y^2 == z^2) > return (x, y, z) > From: http://en.wikibooks.org/wiki/Haskell/Syntactic_sugar > Do and proc notation > Sweet Unsweet > Monadic binding do x <- getLIne getLine >>= \x -> > putStrLn $ "You typed: " ++ x putStrLn $ "You typed: > " ++ x > So, Example 2 desugared becomes... > [1..] >== \z -> ? > Michael > -- Best regards, Bulat mailto:bulat.zigans...@gmail.com _______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe