1class ShoppingCart {
2    items = new Map();
3
4    addItem(product, quantity = 1) {
5        const currentQty = this.items.get(product) || 0;
6        this.items.set(product, currentQty + quantity);
7    }
8
9    getTotalPrice() {
10        let total = 0;
11        for (let [product, quantity] of this.items) {
12            total += product.price * quantity;
13        }
14        return total.toFixed(2);
15    }
16}
17
18const product1 = { name: 'Widget', price: 9.99 };
19const product2 = { name: 'Gadget', price: 19.99 };
20
21const cart = new ShoppingCart();
22cart.addItem(product1, 2);
23cart.addItem(product2, 1);
24
25product1.price = 14.99;
26console.log(cart.getTotalPrice());