Following up on some of the other posts, a quick and easy way to turn an array-based set into a hash-based set is:
%hashset = map {$_=>1} @arrayset;

[download]
If for some reason you are forced to have the set be an array (say you need to keep the order, or you are being passed this array from some module outside of your control), but you will be doing numerous (i.e. more than one) membership tests, it might be worthwhile converting it to a hash-based set, and doing your membership tests on the hash (via exists($hashset{$a})
Best of luck...

--JAS

In reply to Re: Set Operators by jsegal
in thread Set Operators by Anonymous Monk

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