Class Cart

2-copy-of-code/lesson-18/data/cart-class.js:1–79

class Cart {
  cartItems;
  #localStorageKey;

  constructor(localStorageKey) {
    this.#localStorageKey = localStorageKey;
    this.#loadFromStorage();
  }

  #loadFromStorage() {
    this.cartItems = JSON.parse(localStorage.getItem(this.#localStorageKey));

    if (!this.cartItems) {
      this.cartItems = [{
        productId: 'e43638ce-6aa0-4b85-b27f-e1d07eb678c6',
        quantity: 2,
        deliveryOptionId: '1'
      }, {
        productId: '15b6fc6f-327a-4ec4-896f-486349e85a3d',
        quantity: 1,
        deliveryOptionId: '2'
      }];
    }
  }

  saveToStorage() {
    localStorage.setItem(this.#localStorageKey, JSON.stringify(this.cartItems));
  }

  addToCart(productId) {
    let matchingItem;

    this.cartItems.forEach((cartItem) => {
      if (productId === cartItem.productId) {
        matchingItem = cartItem;
      }
    });

    if (matchingItem) {
      matchingItem.quantity += 1;
    } else {
      this.cartItems.push({
        productId: productId,
        quantity: 1,
        deliveryOptionId: '1'
      });
    }

    this.saveToStorage();
  }

  removeFromCart(productId) {
    const newCart = [];

    this.cartItems.forEach((cartItem) => {
      if (cartItem.productId !== productId) {
        newCart.push(cartItem);
      }
    });