'in' for arrays?

[Lionello Lunesu]

Bill Baxter wrote:
> I keep wanting to say
>   if (val in somearray) {
>   }

It makes sense to make "in" behave as if an int[] is a int[int], but the 
problem is that "in" for normal arrays is O(n), slow. If you need to 
search the array, you probably should have been using another container 
in the first place.

My philosophy is always that CPU-expensive actions should also appear as 
such in code. A small "in" that actual does a linear search might seem a 
like a good idea, but people should be discouraged from using it.

L.