P5: OO Inheritance.rb

class Vehicle
   attr_reader :color, :wheels, :status
   def initialize(attributes = {})
      @wheels = attributes[:wheels]
      @color = attributes[:color]
   end

   def drive
      @status = :driving
   end

   def brake
      @status = :stopped
   end
end


class Car < Vehicle
   def needs_gas?
      return [true,true,false].sample
   end
end

class Bus < Vehicle
   attr_reader :num_seats, :fare, :passengers
   def initialize(attributes = {})
      @num_seats = attributes[:num_seats]
      @fare = attributes[:fare]
      @passengers=[]
      super(attributes)
   end

   def drive
      return self.brake if stop_requested?
      @status = :driving
   end

   def admit_passenger(passenger,money)
      @passengers << passenger if money > @fare
   end

   def stop_requested?
      return [true,false].sample
   end

   def needs_gas?
      return [true,true,true,false].sample
   end
end

class Motorbike < Vehicle
   attr_reader :speed
   def drive
      @speed = :fast
      super
   end

   def brake
      @speed = :zero
      super
   end

   def needs_gas?
      return [true,false,false,false].sample
   end

   def weave_through_traffic
      @status = :driving_like_a_crazy_person
   end
end


# Quick Tests

# car1 = Car.new({:color => 'midnight-blue', :wheels => 4})
# p car1
# bus1 = Bus.new({:color => 'hot pink', :wheels => 8, :num_seats => 36, :fare => 1.25})
# p bus1
# excite_bike = Motorbike.new({:color => 'moby dick grey', :wheels => 2})
# bus1.admit_passenger("Evette", 1.50)
# p bus1.passengers