From: Patrick Li <patrickli_2001@...>
Date: 2008-09-01T11:15:40+09:00
Subject: Re: instance_eval/class_eval including/extending modules

I must say that I also find the difference between 
instance_eval/class_eval and include/extend extremely confusing.

If someone clearly knows the fundamental rules, please please share.

Here's my understanding:

def myMethod; end
  -creates a method "myMethod" callable by instances of self.

Here's a list of situations that I'm having trouble with:

1) class Klass
     def myMethod; end
   end

  -self is equal to Klass
  -so myMethod() is callable by Klass.new

2) Klass.instance_eval {def myMethod; end}

 -self is equal to Klass
 -so myMethod() is callable by Klass.new  <-- this isn't true

What's wrong with my understanding? I think I'm not understanding def 
correctly.
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