inheritance.rb

class Vehicle
  attr_reader :color, :wheels
  attr_accessor :status

  def initialize(args = {})
    @color = args[:color]
    @wheels = args[:wheels]
    @status = status
  end

  def drive
    self.status = :driving
  end

  def brake
    self.status = :stopped
  end
end




class Car < Vehicle
  def initialize(args = {})
    super
    @wheels = 4
  end
 
  def needs_gas?
    [true,true,false].sample
  end
end

class Bus < Vehicle
  attr_reader :passengers, :num_seats, :fare
  def initialize(args)
    super
    @num_seats = args[:num_seats]
    @fare = args[:fare]
    @passengers=[]
  end
   
  def drive
    self.brake if stop_requested?
    super
  end
   
  def admit_passenger(passenger, money)
    passengers << passenger if money >= fare
  end

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


class Motorbike < Vehicle
  def initialize(args = {})
    super
    @wheels = 2
  end

  def drive
    super
    @speed = :fast
  end

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

  def weave_through_traffic
    self.status = :driving_like_a_crazy_person
  end
end

P5: OO Inheritance.rb

class Car
 @@WHEELS = 4
 def initialize(args)
   @color = args[:color]
   @wheels = @@WHEELS
 end
 def drive
   @status = :driving
 end
 def brake
   @status = :stopped    
 end
 def needs_gas?
   return [true,true,false].sample
 end
 
end
class Bus
 attr_reader :passengers
 def initialize(args)
   @color = args[:color]
   @wheels = args[:wheels]
   @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
 @@WHEELS = 2
 def initialize(args)
   @color = args[:color]
   @wheels = @@WHEELS

 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

tests.rb

require_relative 'inheritance'

car = Car.new(color: 'red')
bus = Bus.new(color: 'yellow', wheels: 18, num_seats: 32, fare: 2.25)
motorbike = Motorbike.new(color: 'black')

p car.color == 'red'
p car.drive == :driving
p car.brake == :stopped
x = car.needs_gas?
p x == true || x == false

p bus.color == 'yellow'
p bus.wheels == 18
p bus.num_seats == 32
p bus.fare == 2.25
p bus.admit_passenger("john", 2.50).length == 1
p bus.admit_passenger("bob", 1) == nil
p bus.admit_passenger('megan', 2.25).length == 2
p bus.passengers.length == 2
p bus.brake == :stopped
y = bus.stop_requested? 
p !!y == y
foo = bus.needs_gas?
p !!foo == foo

p motorbike.color == 'black'
p motorbike.drive == :fast
p motorbike.status == :driving
p motorbike.brake == :stopped
z = motorbike.needs_gas?
p !!z == z
p motorbike.weave_through_traffic == :driving_like_a_crazy_person

# p bus.drive