P5: OO Inheritance.rb

class Vehicle
    attr_reader :color, :wheels
    def initialize(args)
        @color = args[:color]
        @wheels = 4
    end
end

class Car < Vehicle
    attr_reader
    def initialize(args) 
        super(args)
    end

    def drive
        @status = :driving
    end

    def brake
        @status = :stopped      
    end

    def needs_gas?
        return [true,true,false].sample
    end
 
end
class Bus < Vehicle
    attr_reader :passengers
    def initialize(args)
        super(args)
        @wheels = 8
        @num_seats = args[:num_seats]
        @fare = args[:fare]
        @passengers=[]
    end

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

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

    def brake
        @status = :stopped
    end 

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

    def needs_gas?
        return [true,true,true,false].sample
    end
 
 
end
 
 
class Motorbike < Vehicle
    
    def initialize(args)
        super(args)
        @wheels = 2
    end
 
    def drive
        @status = :driving
        @speed = :fast
    end
 
    def brake
        @status = :stopped 
    end

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

    def weave_through_traffic
        @status = :driving_like_a_crazy_person
    end
end


car = Car.new(color:"white")
bus = Bus.new(color:"yellow", wheels:8, num_seats:30, fare:1)
motorbike = Motorbike.new(color:'blue')

# Car Tests
p car.instance_eval{@color} == "white"
p car.drive == :driving
p car.brake == :stopped
p car.instance_eval{@wheels} == 4

# Bus Tests
p bus.instance_eval{@color} == "yellow"
p bus.instance_eval{@wheels} == 8
p bus.instance_eval{@num_seats} == 30
p bus.brake == :stopped

# Motorbike Tests
p motorbike.instance_eval{@wheels} == 2
p motorbike.brake == :stopped
p motorbike.instance_eval{@color} == "blue"