From: Jason Voegele <jason@...>
Date: 2001-11-14T01:53:26+09:00
Subject: [ruby-talk:25036] Re: Set class in Ruby

>> However, sometimes it's convenient to have Sets, collections where
>> there's only ever one of each element. These have different semantics
>> to arrays: they are not necessarily ordered, attempting to add an
>> element doesn't necessarily increase the size, and so on.
> 
> So, why doesn't Ruby have Set as a built-in class?

Paul Brannan and I are working on implementing a library of data structures 
and algorithms for Ruby to fill this gap.  It is not yet available, but I 
have a Set class that you can get at:

http://www.jvoegele.com/ruby/Set.rb

Paul also has a similar one that may suit your needs.

It is my hope that we'll be able to deliver something that becomes a 
standard part of the Ruby programmer's toolset.

Jason Voegele