How well do you know your Ruby inheritance chain? What is the output of the following script?

class Parent
  def identify
    puts "Parent"
  end
end

class Child < Parent
  def identify
    puts "Child"
    super
  end
end

module FirstMixin
  def identify
    puts "FirstMixin"
    super
  end
end

module SecondMixin
  def identify
    puts "SecondMixin"
    super
  end
end

Child.send :include, FirstMixin
Child.send :include, SecondMixin

my_child = Child.new

class << my_child
  def identify
    puts "Meta"
    super
  end
end

my_child.identify

(scroll down for the answer)



The output:

Meta
Child
SecondMixin
FirstMixin
Parent

First the meta class, then the class itself, then the included modules (most recently included first), and then the superclass.