## mark a section (Learn more)

class Animal def speak "please override me" end end class Dog < Animal def speak # I don't like the parent's speak, so override it "ruff ruff" end end class Duck < Animal def speak "quack quack" end end animals = [Dog.new, Duck.new, Dog.new, Dog.new, Duck.new] #notice here, we don't care what type animal is, all I care about #is that it has the ability to speak animals.each do |animal| puts "#{animal.class} (#{animal.object_id}): #{animal.speak}" end class Zoo attr_reader :animals def initialize @animals = [] end def add_animal(animal) @animals << animal end def make_a_raucus @animals.each {|animal| puts animal.speak} end end

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