Test for element in array

[Andrei Khropov]

Ivan Senji wrote:

> 
> Yeah, some think it is some think it isn't, I think it isn't but it is an old
> discussion and probably one we will never agree on.
> 
> IMO:
> normal arrays store values which are indexed by a key (index)
> associative arrays store keys and the value is just an additional information
> about the key.
> 
> That is only my opinion as some people think that AA's also are about values.

AA is also often called dictionary or map (in STL for example).

If you speak about some kind of collection where only value (and its presense
or absense in the collection) is important it's probably better to call it a
set.

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