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
>
> -- Don
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>
>
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