That works good, but I have a problem with the return type, I forgot to mention... can it be a [char]?? Donald Bruce Stewart wrote:
crespi.albert:
I'm trying to write in Haskell a function that in Java would be something like this:
char find_match (char[] l1, char[] l2, char e){ //l1 and l2 are not empty int i = 0; while (l2){ char aux = l2[i]; char[n] laux = l2; while(laux){ int j = 0; if(laux[j] = aux) laux[j] = e; j++; } if compare (l1, laux) return aux; else i++; } return ''; }
Yikes!
compare function just compares the two lists and return true if they are equal, or false if they are not. it is really a simple function, but I've been thinking about it a lot of time and I can't get the goal. It works like this:
find_match "4*h&a" "4*5&a" 'h' ----> returns '5' (5 matches with the h) find_match "4*n&s" "4dhnn" "k" ----> returns '' (no match at all - lists are different anyway)
That's almost a spec there :)
How about:
import Data.List
findMatch s t c | Just n <- elemIndex c s = Just (t !! n) | otherwise = Nothing
Using it in GHCi:
findMatch "4*h&a" "4*5&a" 'h' Just '5'
findMatch "4*n&s" "4dhnn" 'k' Nothing
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