Module Fun and Pythony Methods In Ruby

gistfile1.rb

module Greeting
  extend self

  def say_hello(greetable = self)
    puts greetable.greeting
  end
end

class Person
  attr_accessor :greeting
end

#
#  Pass the object as a greetable to the module
#
person = Person.new
person.greeting = "Bienvenido, a Miami"

Greeting.say_hello person # "Bienvenido, a Miami"

#
# Include the Greeting module and
# use :say_hello as an instance method
#
person.respond_to? :say_hello #false

Person.send :include, Greeting

person.say_hello # "Bienvenido, a Miami"