Passing 'self' as a parameter when creating an instance of another class.

gistfile1.rb

class Uber_class
  attr_accessor :color
  def initialize(color)
    @color = color
    @bob = Underling.new(self)
  end

  def run
    @bob.test
  end

  def put_test
    puts @color
  end
end

class Underling
  attr_accessor :master_instance

  def initialize(instance)
    @master_instance = instance
  end

  def test
    @master_instance.put_test
  end

end

uber = Uber_class.new("hot pink")
uber.run

uber2 = Uber_class.new("blue")
uber2.run