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CONVENIENCE STORE CHALLENGE

A local convenience store requires an update for their payment registry system. As a developer you were asked to help with this.

Carts and Products

Implement two classes: Product adn ShoppingCart.

Product

  1. Each Product class instance should implement properties:
    • name - a product's name of string type (e.g. "apple", "juice" etc.)
    • price - a price for a single product unit (e.g. 10.59)
  2. Product class should implement get_total method that implements the behavior of calculating the total price for a specified amount of goods

Test cases

obj = Product()
obj.name = "apple"
obj.price = 10.59
assert obj.get_total(0.7) == 7.41

ShoppingCart

  1. ShoppingCart instance are containers for Products.
  2. Implement add_product method to add products instances of specified quantity to the cart instance.
  3. Cart instances should implement get_total method to calculate the total price for all products inside of the cart.

Test cases

apple = Product()
apple.name = "apple"
apple.price = 10.59
juice = Product()
juice.name = "juice"
juice.price = 36.55

obj = ShoppingCart()
obj.add_product(apple, 0.35)
obj.add_product(juice, 4)
obj.add_product(apple, 0.35)

assert obj.get_total() == 153.61

Products to Carts, Carts to Carts

Constructors

  1. Implement both Product and ShoppingCart initializers to provide required data while creating instances. It's ok to initialize empty carts.
  2. Implement a human readable string representations for these classes.

Apple (Fruit) equals to Apple (MacBook)?

  1. Implement equality comparison for the Product instances. Consider the products are equal in case both objects have the same name and price.

Casting

  1. Implement type-casting for Product and ShoppingCart.
    • Product cast to float type should be equal to its price
    • Product cast to string type should be equal to its name
    • ShoppingCart cast to float type should be equal to its total price

Refactor products

  1. Refactor add_product method in a way to avoid product instances duplication in the cart - adjust appropriate quantities only.

Addition

  1. Implement addition behavior for ShoppingCart class:
    • if a Product is added to the cart, the behavior is the same as for add_product method with quantity = 1.
    • if another ShoppingCart instance is added the result is an instance of the same type containing products and their quantities from both carts