title: Convert array to string in NodeJS
body: <p>I want to convert an array to string in NodeJS.</p>
  
  <pre><code>var aa = new Array();
  aa['a'] = 'aaa';
  aa['b'] = 'bbb';
  
  console.log(aa.toString());
  </code></pre>
  
  <p>But it doesn't work.<br>
  Anyone knows how to convert?</p>