OOP Electronics Store Example

cellphone.rb

class Cellphone < Product

  def initialize(name, price, brand)
    super
  end

end

customer.rb

class Customer

  attr_reader :cart, :budget

  def initialize(budget = 500)
    @cart = []
    @budget = budget.nil? ? 500 : budget
  end

end

laptop.rb

class Laptop < Product

  attr_reader :size, :ram, :processor

  def initialize(name, price, brand, specs)
    super(name, price, brand)
    @size = specs[:size]
    @ram = specs[:ram]
    @processor = specs[:processor]
  end

end

product.rb

class Product

  attr_reader :name, :brand
  attr_accessor :price

  def initialize(name, price, brand)
    @name = name
    @price = price
    @brand = brand
  end

end

shop.rb

class Shop

  attr_reader :name, :inventory, :sales

  def initialize(name)
    @name = name
    @inventory = []
    @sales = []
  end

  def find_inventory_product(product_to_find)
    @inventory.find{|product|
      product == product_to_find
    }
  end

  def add_to_inventory(product)
    @inventory.push(product)
    # the more Ruby style way of pushing
    # @inventory << product
  end

  def sell_item(product)
    # return false if the product isn't found in inventory
    return false if find_inventory_product(product).nil?
    @sales.push(product) # add product to sales list
    @inventory.delete(product) # remove product from inventory
    product
  end

  def revenue
    self.sales.inject(0){|sum, current_sale|
      sum += current_sale.price
    }
  end

end

tv.rb

class Tv < Product

  attr_reader :size

  def initialize(name, price, brand, size)
    super(name, price, brand)
    @size = size
  end

end