car.rb

class Car
  attr_reader :color, :engine_started, :accessory

  # Public interface
  def initialize(color)
    @color = color
    @engine_started = false
  end

  def start_engine
    pre_heat_engine
    start_gaz_pump
    @engine_started = true
  end

  def paint(color)
    @color = color
  end

  def pimp(accessory)
    @accessory = accessory
  end
  # Private interface
  private

  def start_gaz_pump
    puts "gaz pump started"
  end

  def pre_heat_engine
    puts "engine pre-heat"
  end

end

red_car = Car.new("red")
green_car = Car.new("green")
red_car.start_engine
p red_car
# red_car.pimp("spoiler")
# p red_car
p red_car.accessory