From: Smart Andy <smartandy007@...>
Date: 2011-03-08T16:24:18+09:00
Subject: Re: basic programming question, help please

Class methods are methods that are called on a class and instance
methods are methods that are called on an instance of a class. Here is a
an example to give you an idea:

class Doo
  def self.bar
    puts 'class method'
  end

  def baz
    puts 'instance method'
  end
end

Doo.bar # => "class method"
Doo.baz # => NoMethodError: undefined method ‘baz’ for Doo:Class

Doo.new.baz # => instance method
Doo.new.bar # => NoMethodError: undefined method ‘bar’ for 
#<Doo:0x1e820>

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