01.Class Storage

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

        this.getTotalCost();
    }

    getTotalCost () {

        for (let product of this.storage) {
            this.totalCost += (Number(product.quantity) * Number(product.price));
        }

        return this.totalCost
    }

    addProduct (object) {
        if (Number(object.quantity) <= this.capacity) {
            this.storage.push(object);
            this.capacity -= Number(object.quantity);
        }
        this.totalCost = 0
        this.getTotalCost();
    }

    getProducts () {
        let result = []
        for (let product of this.storage) {
            result.push(JSON.stringify(product));
        }

        return result.join('\n');
    }
}