From: matz@... (Yukihiro Matsumoto)
Date: 2000-09-04T18:30:45+09:00
Subject: [ruby-talk:4775] Re: Module vs. Class

Hi,

In message "[ruby-talk:4774] Module vs. Class"
    on 00/09/04, Jilani Khaldi <jilanik@tin.it> writes:

|when it is more convenient to use module than classes, seen classes can
|handle every thing that modules do (IMHO)?
|Thanks.

Two purpose; to provide merely a namespace, and to implement mix-in.

Module is a superclass of Class.  And modules cannot:

  * be inherited
  * instantiate an object

But they can be included from other classes/modules, where classes
cannot be included.

FYI, module inclusion is the only way to implement multiple
inheritance in Ruby.

							matz.