Animals, round 3

animals_3.rb

# IRRELEVANT CODE EXCISED

class Animal
  @animals = []
  def self.animals
    @animals
  end

  def initialize(args={})
    Animal.animals << self
    after_initialize(args)
  end
 
  def after_initialize(args)
  end
 
  def self.all
    self.animals
  end
end

class Lion < Animal
  @animals = []
  
  def after_initialize(args)
    self.class.animals << self
  end
end

Lion.new
Animal.all # => [#<Lion:0x0000010187de60>]
Animal.all.object_id # => 2160486800
Lion.all # [#<Lion:0x0000010187de60>]
Lion.all.object_id # => 2160342160