00-simple.rb

module SayHello
  def hello
    puts "hello from SayHello"
  end
end

include SayHello

hello

000-README

Any of these should be runnable at the command line by ruby <filename>

01-existing-module.rb

include Math

puts sqrt(25)

02-classy.rb

module Herp
  def herp
    "herp"
  end
end

class Derp
  include Herp
end

puts Derp.new.herp

03-classlevel.rb

# you can use extend to add new class methods
module Home
  def steal
    "home"
  end
end

class Score
  extend Home
end

puts Score.steal

04-classlevel2.rb

# what's going on with extend
module Inspector
  def saywhat
    self.inspect
  end
end

class Derp
  include Inspector
  extend  Inspector
end

puts Derp.new.saywhat
puts Derp.saywhat

05-constants.rb

module M
  CONSTANT = "value"
end

class C
  include M
end

class D
  extend M
end

puts C::CONSTANT
puts D::CONSTANT # wha?