Dr.Ruud wrote:
> Ken Foskey schreef:
>> Mathew Snyder:
>
>>> Is there an easy way to determine if an item is in an array without
>>> iterating through the array and comparing each element to the item
>>> in question?
>> Look up grep.
>
> That still involves iterating and comparing each element, but now done
> (faster) by grep.
>
> If the array is already sorted, a binary search would be the way to go.
>
> Otherwise you can use a loop that short-circuits by using "last" if the
> item is found.
>
>
> With smallish arrays, you can even use index(), after stringizing it:
>
> $string = join $;, ('', @array, '');
> index($string, "$;$item$;") >= 0 and print "found\n";
>
> or use a regular expression:
>
> $string = join "\n", @array;
> /^$item$/m and print "found\n";
>
>
>> You might be wanting a hash table not an array.
>
> Yes, that is the best answer. Especially if multiple items need to be
> tested.
>
I ended up using hashes for what I needed. Thanks for the input.
Mathew
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