class-storage.js

class Storage {
    constructor(capacity) {
        this.capacity = Number(capacity);
        this.storage = [];
        this.totalCost = 0;
    }

    addProduct(product) {
        this.storage.push(product);
        let quantity = Number(product.quantity);
        let price = Number(product.price);
        this.capacity -= quantity;
        this.totalCost += quantity * price;
    }

    getProducts() {
        this.storage.forEach(element => {
            console.log(JSON.stringify(element));
        });
    }
}

let productOne = {name: 'Cucamber', price: 1.50, quantity: 15};
let productTwo = {name: 'Tomato', price: 0.90, quantity: 25};
let productThree = {name: 'Bread', price: 1.10, quantity: 8};
let storage = new Storage(50);
storage.addProduct(productOne);
storage.addProduct(productTwo);
storage.addProduct(productThree);
storage.getProducts();
console.log(storage.capacity);
console.log(storage.totalCost);