How to implement polymorphic behavior

polymorphic.rb

class Animal
    def initialize
    end
    def talk
        raise NotImplementedError("Subclass must implement abstract method")
    end
end

class Cat
    def talk
        return 'Meow!'
    end
end
 
class Dog
    def talk
        return 'Woof! Woof!'
    end
end

animals = [Cat.new,
           Dog.new]
 
animals.each do |animal|
    puts animal.talk()
end

ugly_procedural.rb

class Animal 
    attr_accessor :type

    def initialize
    end

    def talk
      if type == "Cat"
        return "Meow!"
      elsif type "Dog"
        return "Woof! Woof!"
      else
        return "WTF dude!"
      end
    end
end

hablar como esto viola el Open Close Principle

por que 4 espacios de indent?

caring about indentation misses the point of the gist.

hurts my eyes....