Ruby/Class/include

class Person
  attr_reader :name, :age, :occupation
  def initialize(name, age, occupation)
    @name, @age, @occupation = name, age, occupation
  end
  def isIn?
    true
  end
end
jimmy = Person.new("J", 21, "reporter")
clark = Person.new("C", 35, "reporter")
jimmy.isIn?                                     # => true
clark.isIn?                                     # => true
 
module SuperPowers
  def fly
    "Flying!"
  end
  def leap(what)
    "Leaping #{what} in a single bound!"
  end
  def mild_mannered?
    false
  end
  def superhero_name
    "Superman"
  end
end
clark.extend(SuperPowers)
clark.superhero_name                          # => "Superman"
clark.fly                                     # => "Flying!"
clark.isIn?                                   # => false
jimmy.isIn?                                   # => true

class Person
  attr_reader :name, :age, :occupation
  def initialize(name, age, occupation)
    @name, @age, @occupation = name, age, occupation
  end
  def mild_mannered?
    true
  end
end
module SuperPowers
  def fly
    "Flying!"
  end
  def leap(what)
    "Leaping #{what} in a single bound!"
  end
  def mild_mannered?
    false
  end
  def superhero_name
    "Superman"
  end
end
class Person
  extend SuperPowers
end
# which is equivalent to:
Person.extend(SuperPowers)
Person.superhero_name                   # => "Superman"
Person.fly                              # => "Flying!"

#!/usr/bin/env ruby
module Dice
  # virtual roll of a pair of dice
  def roll
    r_1 = rand(6); r_2 = rand(6)
    r1 = r_1>0?r_1:1; r2 = r_2>0?r_2:6
    total = r1+r2
    printf( "You rolled %d and %d (%d).\n", r1, r2, total )
    total
  end
end
class Game
 include Dice
end
g = Game.new
g.roll

module MyModule
  def potato
    "A"
  end
end
module ModuleB
  def potato
    "B"
  end
end
class Potato
  include MyModule
  include ModuleB
end
puts Potato.new.potato