From: "Eric I." <rubytraining@...>
Date: 2007-12-12T00:30:17+09:00
Subject: Re: Set and Object equivilence

Hi Andrew,

First, change your .eqls? method to .eql? and that will fix your code.

Also, you should look into the Comparable mix-in module.  Basically,
if you define the spaceship operator (<=>) and include Comparable in
your class, it will define it will define all the relational operators
(==, <, <=, >, >=) and between? for you.  Plus, != is internally
implemented as the boolean negation of ==, so you get that also.

For Set member equality, two methods are used -- eql? and hash.

Eric

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