title: What happens if the new instance object is not assign to a variable?
body: <p>What happens if you not assign new object to a variable? 
  For example:</p>
  
  <pre><code>function MyConstructor() {
     // Codes here
  };
  
  new MyConstructor(); // new object instance is not assign to a variable
  </code></pre>
  
  <p>Is this code is dangerous? 
  Does it clobber the global namespace? 
  Is it possible to access the object created with this style?</p>
  
  <p>Thanks.</p>