ECMAScript 6 - Classes

.js

class Movie {
  constructor() {
    this.title = '';
  }
  getTitle() {
    return this.title;
  }
  setTitle(title) {
    this.title = title;
  }
}

class Theater {
  constructor() {
    this.movies = [];
  }
  getMovies() {
    return this.movies;
  }
  setMovies(movie) {
    this.movies.push(movie);
  }
}

var theater = new Theater();

var movie = new Movie();
movie.setTitle('The King\'s Speech');
theater.setMovies(movie);

var movie = new Movie();
movie.setTitle('Enemy at the Gates');
theater.setMovies(movie);

var console = document.getElementById('console');
console.innerHTML = JSON.stringify(theater.getMovies());