Ruby's inheritance

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class Animal
  attr_accessor :name

  def initialize(name)
    @name = name
  end

  def speak
    "#{ name } is speaking!"
  end
end

class Dog < Animal
  def speak
    "#{ name } is barking!"
  end
end

class Cat < Animal
end

fido = Dog.new('fido')
puts fido.name
puts fido.speak

kitty = Cat.new('kitty')
puts kitty.name
puts kitty.speak

puts Dog.ancestors

produce

fido
fido is barking!
kitty
kitty is speaking!
Dog
Animal
Object
Kernel
BasicObject