Create clases and objects for a cinema program

Script
class Movie {
  constructor(title, director) {
    // add your code here
    this.title = title;
    this.director = director;
  }

  getTitle() {
    return this.title;
  }

  getDirector() {
    return this.director;
  }

  addStar(star) {
    this.stars.push(star);
  }

  getStars() {
    return this.stars;
  }

  addWriter(writer) {
    this.writers.push(writer);
  }

  getWriters() {
    return this.writers;
  }

  addRating(rating) {
    let numRating = Number(rating);
    if (Number.isNaN(numRating) || numRating < 1 || numRating > 5) {
      console.log("Invalid Rating");
    } else {
      this.ratings.push(numRating);
    }
  }

  getAverageRating() {
    let sum = this.ratings.reduce(function(a, b) {