bearophile wrote:
> Pelle M.:
>
>> It doesn't exist for performance reasons, I think.
>
> It's not a matter of performance. Walter thinks that "in" on
> AAs searches on keys. And the "keys" of a dynamic array are its
> indices. And searching for indices in a dynamic array is not so
> useful. Therefore no "in" for dynamic/static arrays. I think
> this line of thought is not practical, and Python gets this
> better.
I think Walter's is a good point. If 'in' searches among keys for AAs;
for arrays, it would be implemented trivially as
(index >= 0) && (index < array_length)
I think that expression allows for negative index values too. And yes, I
had to check before posting as I can't be sure about the integer
promotion rules. :)
If 'in' were to search among the values of arrays, then it wouldn't have
the same meaning with AAs.
Ali
