Animals, round 1

animals.rb

class Animal
  @@animals = []
  @@legs = 4

  def initialize(args={})
    @@animals << self
    after_initialize(args)
  end

  def after_initialize(args)
  end

  def legs
    @@legs
  end
  
  def self.all
    @@animals
  end
end


class Octopus < Animal
  @@octopi = []
  @@legs = 8

  def after_initialize(args={})
    @@octopi << self
  end
  
  def self.all
    @@octopi
  end
end


class Llama < Animal
  @@llamas = []

  def after_initialize(args={})
    @@llamas << self
  end
  
  def self.all
    @@llamas
  end
end

Llama.new.legs # => 8