Oke, I'm not sure I understand you right. Let's say I have this list [1,2,3,4]How must I use head now ? Roelof Date: Mon, 27 Jun 2011 14:50:14 +0300 From: mats.rauhala@gmail.com To: beginners@haskell.org Subject: Re: [Haskell-beginners] first number is a list I'm sorry, I'm not entirely sure what you're trying to do. Are you trying to find the first number _in_ a list? That could be done with for example pattern matching: head (x:_) = x head _ = error "Empty list" The guards in list comprehension requires booleans, you gave it a function that takes a list and returns an item of the same time. last :: [a] -> a -- Mats Rauhala MasseR _______________________________________________ Beginners mailing list Beginners@haskell.org http://www.haskell.org/mailman/listinfo/beginners