title: What is Javascript FunctionList?
body: <p>I was playing an online game named <code>untrusted</code>, which is played by writing code.
  There are some syntax that I've never seen before and couldn't find one the web. Can someone explain this to me? </p>
  
  <pre><code>functionList['movePlayerToExit'] = function () {
      map.writeStatus("Permission denied.");
  }
  
  functionList['pleaseMovePlayerToExit'] = function () {
      map.writeStatus("I don't think so.");
  }
  
  functionList['movePlayerToExitDamnit'] = function () {
      map.writeStatus("So, how 'bout them &lt;LOCAL SPORTS TEAM&gt;?");
  }
  </code></pre>
  
  <p>Please explain the what is <code>functionList</code>, thank you!</p>
  
  <p>And for those who are familiar with this game, please don't spoil, thank you again!</p>