From: jake kaiden <jakekaiden@...>
Date: 2011-08-10T08:05:23+09:00
Subject: Re: Problem in typical code

hi Amir,

  "self" can be a bit confusing at times, but you can think of it as 
representing whatever class (or instance of that class) you are dealing 
with...

  for example:

  here, "self" is whatever Fixnum you happen to use with the #double 
method

     class Fixnum

  def double
    p self * 2
  end

     end

     3.double

     => 6


  here, "self" is whatever Array you happen to create and use with the 
#double method...

     class Array

  def double
    self.each_with_index{|entry, index|
      new = entry * 2
      self[index] = new
    }
  end

     end

     foo = ["a", "b", "c"]
     foo.double
     p foo

     => ["aa", "bb", "cc"]


 - j

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