From: "Jan E." <lists@...>
Date: 2012-04-19T03:00:50+09:00
Subject: Re: Why must I know whether I extend a class or a module?

Hi,

The syntax you're talking about is used both for defining and modifying 
a class/module. That's why there's an explicit "class" or "module" 
keyword in it.

If you don't want to distinguish between a class and a module, use the 
class_eval method. This works for both:

####
module M; end

M.class_eval do
  def test
    puts 1
  end
end
####

However, I can barely imagine this problem will ever occur in reality. I 
mean: Do you really add methods to objects you don't even know?

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