How do you do polymorphism in Ruby?

Question

In C#, I can do this:

class Program
{
    static void Main(string[] args)
    {
        List animals = new List();

        anima         


        

Answer 1

This is how I would write it:

class Animal
  def make_noise; '' end
  def sleep; puts "#{self.class.name} is sleeping." end
end

class Dog < Animal; def make_noise; 'Woof!' end end
class Cat < Animal; def make_noise; 'Meow!' end end

[Dog.new, Cat.new].each do |animal|
  puts animal.make_noise
  animal.sleep
end

It's not really different from the other solutions, but this is the style that I would prefer.

That's 12 lines vs. the 41 lines (actually, you can shave off 3 lines by using a collection initializer) from the original C# example. Not bad!