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

    get totalCost() {
        return this.storage.reduce((acc, el) => acc + el.price * el.quantity, 0);
    }

    addProduct(product) {
        this.storage.push(product);
        this.capacity -= product.quantity;
    }

    getProducts() {
        let output = [];
        this.storage.forEach(product => {
            output.push(JSON.stringify(product));
        })
        return output.join('\n');
    }
}