title: Passing this as a parameter
body: <p>I've seen code that have passed the keyword <code>this</code> as an input parameter.
  <strong>For instance:</strong></p>
  
  <pre><code>getContainer(this);
  </code></pre>
  
  <p>What does the keyword <code>this</code> mean? I've heard that it refers to an instance of the class itself (or something along those lines), but how does that work?</p>