Re: [Haskell-beginners] Ignoring the result of a monadic computation

Hi Haskellers, this was my first post and I'm thankful and really impressed how many qualified answers I got. I've been learning Haskell only for a short time but I'm really fascinated how mathematical and expressive a programming language can be (I usually code Java). Recently I read a blog post, with a function map (length &&& head) . group that was much shorter and more elegant than the corresponding Python code. That was the main reason for me to try to write my own code in a single line without any lambda expressions. Regards Tim -------- Original-Nachricht --------

Datum: Fri, 19 Nov 2010 07:56:02 +0100 Von: "Tim Baumgartner" An: beginners@haskell.org Betreff: [Haskell-beginners] Ignoring the result of a monadic computation

Hi,

while learning about monads, I had something like

do line <- getLine something putStrLn line

and I wondered if I could write it in one line, without naming of parameters. I finally came up with

getLine >>= ignore something >>= putStrLn

using ignore :: Monad m => m a -> b -> m b ignore m a = m >> return a

I'm satisfied with this solution but searching hoogle I didn't find a standard function for my ignore. Am I missing something?

Cheers, Tim -- GRATIS! Movie-FLAT mit über 300 Videos. Jetzt freischalten unter http://portal.gmx.net/de/go/maxdome _______________________________________________ Beginners mailing list Beginners@haskell.org http://www.haskell.org/mailman/listinfo/beginners

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