this7b.js

// option 1
var theater = {
  playMovie: function(movie, previewLength) {
    this.loadProjector(movie);
    
    setTimeout(function() {
      console.log("Now playing: " + this.movie);
    }.bind(this), previewLength);
  }
}

// option 2
var theater = {
  playMovie: function(movie, previewLength) {
    var self = this;
    
    this.loadProjector(movie);
    
    setTimeout(function() {
      console.log("Now playing: " + self.movie);
    }, previewLength);
  }
}