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Exercise 3

Create a module that you can mix in to ONE of your subclasses that describes a behavior unique to that subclass.

Solution

module Towable
  def can_tow?(pounds)
    pounds < 2000
  end
end

class Vehicle
  @@number_of_vehicles = 0

  def self.number_of_vehicles
    puts "This program has created #{@@number_of_vehicles} vehicles"
  end

  def self.gas_mileage(gallons, miles)
    puts "#{miles / gallons} miles per gallon of gas"
  end

  def initialize
    @@number_of_vehicles += 1
  end
end

class MyCar < Vehicle
  NUMBER_OF_DOORS = 4
  #code omitted for brevity...
end

class MyTruck < Vehicle
  include Towable

  NUMBER_OF_DOORS = 2
end

Video Walkthrough

Errata:

  • The narrator uses a ternary operator for the Towable#can_tow? method. This isn't necessary as the comparison itself (ie, pounds < 2000) returns a boolean.

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