refactor backup

        /**
         * @param {string} category
         */
        getProductArray(category){
            const index = this.cart.findIndex( (cart) => {
                cart.category === category;
            });

            let productArray;

            if(index >= 0){
                productArray = this.cart[index].products;
            }
            else{
                productArray = {category: category, products: []};
                this.cart.push(productArray);
            }

            return productArray;
        },