P5: OO Inheritance.rb

class Vehicle
	def initialize(args)
		@color = args[:color]
		@wheels = 4
	end
 
	def drive
		@status = :driving
	end
 
	def brake
		@status = :stopped      
	end
 
	def needs_gas?
		return [true,true,false].sample
	end
end

class Car < Vehicle; end
 
class Motorbike < Vehicle
	def initialize(args)
		super
		@wheels = 2
	end
 
	def drive
		super
		@speed = :fast
	end
 
	def weave_through_traffic
		@status = :driving_like_a_crazy_person
	end
 
end
 
class Bus < Vehicle
	attr_reader :passengers
 
	def initialize(args)
		super
		@wheels = args[:wheels]
		@num_seats = args[:num_seats]
		@fare = args[:fare]
		@passengers=[]
	end
 
	def drive
		return self.brake if stop_requested?
		super
	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
 
 
# Driver Code
 
car = Car.new(color: "red")
p car.drive
p car.brake
p car.needs_gas?
 
 
bus = Bus.new(color: "yellow", wheels: 8, num_seats: 48, fare: 0)
p bus.drive
bus.admit_passenger("Blake", 1)
p bus.passengers
p bus.stop_requested?
p bus.drive
p bus.needs_gas?
 
 
bike = Motorbike.new(color: "black")
p bike.drive
p bike.brake
p bike.needs_gas?