talk.rb

talk.rb

class Animal
  attr_accessible :kind
  
  def talk
    fail "I don't know how to talk! "
  end
end

class Cat < Animal
  def talk
    puts "Miau"
  end
end

class Dog < Animal
  def talk
    puts "Guau"
  end
end

class Bird < Animal
  def talk
    puts "Pio"
  end
end

[Bird.new, Dog.new, Cat.new].map &:talk
"Pio"
"Guau"
"Miau"