title: What does empty square brackets represent as a variable value in javascript?
body: <p>I'm wondering what do those empty square brackets do in those two variables (invited, rsvps) in the code below.</p>
  
  <pre><code>Parties.insert({
    _id: id,
    owner: this.userId,
    x: options.x,
    y: options.y,
    title: options.title,
    description: options.description,
    public: !! options.public,
    invited: [],
    rsvps: [],
    likes: 0,
  });
  </code></pre>