A Shortcut for Creating Getters and Setters

Ruby_Getters_Setters.rb

# Getters and Setters
class Car
  def color=(c)
    @color = c
  end

  def color
    @color
  end
end

ferrari = Car.new

ferrari.color = "Red"
ferrari.color #=> "Red" 

#Getters and Setters with attr_*
class Car
  attr_accessor :color
  attr_reader :speed
  attr_writer :lights

  def turn_on(on)
    if on
      @speed = 10
    else
      @speed = 0
    end
  end

  def accelerate
    @speed += 10
  end

  def light_setting
    if @lights == :position_one
      "Lights are off"
    elsif @lights == :position_two
      "Lights are on (low beam)"
    elsif @lights == :position_three
      "Lights are on (high beam)"
    end
  end
end

ferrari = Car.new

# attr_accessor
ferrari.color = "Red"
ferrari.color     #=> "Red"

# attr_reader
ferrari.turn_on(true)
ferrari.speed     #=> 10
ferrari.accelerate
ferrari.speed     #=> 20

# attr_writter
ferrari.lights = :position_one
ferrari.light_setting     #=> "Lights are off"