shopping-cart-js

Javacsript shopping cart

Prerequisites

install node8+
install dependencies npm install

Requirements

All Cases should have full unit test coverage.
Follow OO Solid Principles and write easy to understand code.
Be Ready to add new requirements, do pair programming and explain your code.
Do not copy the code from google. Provide your own implementation. Implement an e-commerce shopping cart class.

Rules

Product has a title and price.
Product belong to a category.
Category may or may not have a parent category.
Category has a title.
Products are added to the Cart with quantity info.
Campaigns exist for product price discounts.
Campaigns are applicable to a product category.
Campaign discount vary based on the number of products in the cart
Coupons exist for cart discounts.
Coupons have minimum cart amount constraint. If Cart amount is less than minimum discount is not applied.
Delivery Cost is Dynamic. Based on the number of deliveries and number of products.

Cart

Implement a class that takes a cart and calculates the delivery cost.

//sample creating a new category
Category food = new Category("food");
//products
Product apple = new Product("Apple", 100.0, category);
Product almond = new Product("Almonds", 150.0, category);
//Products can be added to a shopping cart with quantity
ShoppingCart cart = new ShoppingCart();
cart.addItem(apple,3);
cart.addItem(almond,1);

Discounts

//you can apply discounts to a category
//discount rules can be 20% on a category if bought more than 3 items
Campaign campaign1 = new Campaign(category,20.0,3,DiscountType.Rate);
//another campaign rule 50% on a category if bought more than 5 items
Campaign campaign2 = new Campaign(category,50.0,5,DiscountType.Rate);
//another campaign rule 5 TL amount discount on a category if bought more than 5 items
Campaign campaign3 = new Campaign(category,5.0,5,DiscountType.Amount);
//Cart should apply the maximum amount of discount to the cart.
cart.applyDiscounts(discount1,discount2,discount3);
//You can also apply a coupon to a cart
//Coupons have minimum amount. If the cart total is less than minimum amount, coupon is not applicable
//Coupon for 100 TL min purchase amount for a 10% discount
Coupon coupon = new Coupon(100, 10, DiscountType.Rate)
cart.applyCoupon(coupon)

Campaign Discounts are applied first, Then Coupons.

Delivery

To optimize our delivery Cost, we want to apply dynamic cargo pricing rules based on the number of deliveries and number of products in the cart. Formula is (CostPerDeliveryNumberOfDeliveries) + (CostPerProductNumberOfProducts) + Fixed Cost Fixed cost is 2.99 TL. Implement a class that takes a cart and calculates the delivery cost.

DeliveryCostCalculator deliveryCostCalculator = new DeliveryCostCalculator(costPerDelivery,costPerProduct,fixedCost);
double deliveryCostCalculator.calculateFor(cart)

NumberOfDeliveries is calculated by the number of distinct categories in the cart. If cart has products that belong to two distinct categories, number of deliveries is 2. NumberOfProducts is the number of different products in the cart. It is not the quantity of products.

Cart Responsibilities

double cart.getTotalAmountAfterDiscounts()
double cart.getCouponDiscount()
double cart.getCampaignDiscount()
double cart.getDeliveryCost()

Group Products by Category and Print the CategoryName, ProductName, Quantity, Unit Price, Total Price, Total Discount(coupon,campaign) applied

cart.print()

At the final line print total amount and the delivery cost. You will be asked additional requirements in the interview and how to implement them. Please Drive your code with Tests and follow Object Oriented Design Principles (SRP, OCP)

ridakk / shopping-cart-js