On Wed, Jul 30, 2003 at 11:07:02AM +0900, Mark J. Reed wrote:
> It's not a lookup; it's a membership test.  Sets are not Hashes - they're
> Arrays that don't allow duplicate values.

I disagree - Arrays are ordered, Sets are not.

irb(main):003:0> a = Set[1,2,3,4,5]
=> #<Set: {5, 1, 2, 3, 4}>

Regards,

Brian.