A question - is there an object in Ruby analogous to a Java set, which 
has hash-like functionality but no values?

Or should I just use a hash with no values?

Actually, what I'm _really_ trying to do is "unique-ize" an array based 
on a particular attribute of each of it's members.  My plan was to read 
the unique attribute values into a hash as they come up and compare new 
array member's attributes against that hash.

I bet there's a very cool way to do it ;) - if anyone knows and would 
like to share, I am all ears.

Thanks,
Wes

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