From: ThoML <micathom@...>
Date: 2008-05-17T12:55:05+09:00
Subject: Re: Monkey Patching (definition)?

> puts c.foo(42)
> # bar 42 -- the new method ran over the old one

In a class-based OO language with open classes like ruby, I'd actually
expect that behaviour.

> puts [] == 42
> # false -- the new method was ignored

Array.respond_to?('==')
=> true

That's because of:
Object.method_defined?('==')
=> true

BTW I think you wanted to use method_defined?() or instance_method()
instead of respond_to?() which in your case refers to the class and
not to the instances thereof. In your example, you actually check if
there is a class method of that name and then define an instance
method.