class storage

 class Storage {
    constructor(cap) {
        this.capacity = cap,
        this.storage = []
        this.totalCost = 0;
        this.addProduct = (p) => {
            let arr = p;
            this.capacity -= arr.quantity;
            this.totalCost += arr.price * arr.quantity;
            this.storage.push(p)
        }
        this.getProducts = () => {
            return this.storage.map(element => JSON.stringify(element)).join('\n');
        }
    }
}