export class RatingsComponent {
    ...
    set rating(v) {
        this._rating = v;

        // triggers DOM update
        this.updateRatings();
    }

    get rating() {
        return this._rating;
    }

    updateRatings() {
        this.elements.forEach((element, index) => {
            if (index < this.rating) {
                element.classList.remove('outline');
                element.classList.add('solid');
            } else {
                element.classList.remove('solid');
                element.classList.add('outline');
            }
        });
    }
}