Ruby demo: extending modules with other modules

extend_demo.rb

module Base
  extend self

  def hi
    puts "Base says hi"
  end
end

module Ext1
  def hi
    puts "Ext1 says hi"
    super
  end
end

module Ext2
  def hi
    puts "Ext2 says hi"
    super
  end
end

Base
  .extend(Ext1)
  .extend(Ext2)
  .hi

# =>
# Ext2 says hi
# Ext1 says hi
# Base says hi

p Base.class.ancestors

# =>
# [Module, Object, Kernel, BasicObject]

p class << Base; ancestors; end

# =>
# [Ext2, Ext1, Base, Module, Object, Kernel, BasicObject]

Have the hip Ruby kids found a cooler way of getting at the singleton class or is that hack on 39 still how it's done?

Have the hip Ruby kids found a cooler way of getting at the singleton class or is that hack on 39 still how it's done?

Ruby 1.9+ has Object#singleton_class.