Sihui

class PizzaStore
  attr_accessor :pizza_prototype_collection
  
  def initialize
    @pizza_prototype_collection = {}
  end

  def take_order(pizza_type)
    pizza_prototype = pizza_prototype_collection[pizza_type]
    raise 'unsupported pizza type' unless pizza_prototype

Sihui

class PizzaStore
  def take_order(pizza_type)
    case pizza_type
    when 'matcha'
      pizza = Pizza.new('Matcha Pizza', ['matcha powder'])
    when 'pepperoni'
      pizza = Pizza.new('Pepperoni Pizza', ['pepperoni', 'shredded mozzarella cheese'])
    when 'chicken'
      pizza = Pizza.new('Chicken Pizza', ['chicken', 'mushroom', 'spinach'])
    else

Sihui

class PizzaStore
  def take_order(pizza_type)
    case pizza_type
    when 'pepperoni'
      pizza = Pizza.new('Pepperoni Pizza', ['pepperoni', 'shredded mozzarella cheese'])
    when 'chicken'
      pizza = Pizza.new('Chicken Pizza', ['chicken', 'mushroom', 'spinach'])
    else
      pizza = Pizza.new('Cheese Pizza', ['cheese'])
    end

Sihui

class Pizza
  attr_reader :name, :toppings, :state
  
  def initialize(name, toppings)
    @name = name
    @toppings = toppings
    @state = 'raw'
  end
  
  def bake

Sihui

class CarConstructionDirector
  def construct_car(builder:)
    builder.build_car_frame
    builder.add_engine
    builder.add_front_wheels
    builder.add_back_wheels
    builder.add_dashboard
    builder.add_energy_source
    builder.car
  end

Sihui

class ElectronicCarBuilder
  attr_reader :car
  
  def initialize
    @car = ''
  end
  
  def build_car_frame
    car << "This is an electronic car\n"
  end

Sihui

class SportsCarBuilder
  attr_reader :car
  
  def initialize
    @car = ''
  end
  
  def build_car_frame
    car << "This is a sport car\n"
  end

Sihui

class StandardCarBuilder
  attr_reader :car
  
  def initialize
    @car = ''
  end
  
  def build_car_frame
    car << "This is a standard car\n"
  end

Sihui

class ElectronicCarBuilder
  def build
    car = ''
    # 1. build car frame
    car << "This is an electronic car\n"
    # 2. add an engine
    car << "  with a electronic engine\n"
    # 3. add front wheels
    car << "  with two front wheels\n"
    # 4. add back wheels

Sihui

class SportsCarBuilder
  def build
    car = ''
    # 1. build car frame
    car << "This is a sport car\n"
    # 2. add an engine
    car << "  with a powerful engine\n"
    # 3. add front wheels
    car << "  with two front wheels suitable for mountain paths\n"
    # 4. add back wheels