From: Kaye Ng <sbstn26@...>
Date: 2011-03-07T20:39:32+09:00
Subject: basic programming question, help please

class Square
  def initialize
    if defined?(@@number_of_squares)
      @@number_of_squares = @@number_of_squares + 1
    else
      @@number_of_squares = 1
    end
  end
  def self.count
    @@number_of_squares
  end
end

a = Square.new    #would return 1
b = Square.new    #would return 2
puts Square.count #2 would be printed on the screen

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My question is: why is the "self" necessary in "def self.count".
I don't understand the logic behind it.

(I know that I can also type "def Square.count" instead of "def
self.count")

Thanks guys!

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