13 Feb
2004
13 Feb
'04
3:53 p.m.
Hi, I'm a really beginner to haskell and I have a question about using classes. I don't now really what this function does. So I will try to use it to see what it will put out position :: ( Enum a , Eq b ) => b -> [b] -> [a] position x = position_snd . zip ( enumFrom $ toEnum 1 ) where position_snd [] = [] position_snd ((p,y):ys) | x == y = p : position_snd ys | otherwise = position_snd ys My roblem is now that I don't know how to use it. I tried "head position 2 [1,2,3,4]" but I always get an error. Thanks for help André