title: How to test same object instance in Javascript?
body: <p>Say I have the following objects in Javascript:</p>
  
  <pre><code>var a = { xxx: 33 };
  var b = { xxx: 33 };
  var c;
  
  c = a;
  </code></pre>
  
  <p>What is the Javascript test that will tell me whether I am dealing with the same object instance? In other words, it should return false for a and b, b and c, but true for a and c.</p>