title: Use of $.extend function in jQuery with multiple objecs
body: <p>I am new to jQuery and I want to know about $.extend() function in jQuery.</p>
  
  <p>Can anyone please explain the difference between following statements?</p>
  
  <pre><code>$.extend(true,ob1,ob2);
  
  $.extend(true,{},ob1,ob2);
  
  $.extend(true,ob1,{},ob2);
  
  $.extend(true,ob1,ob2,{});
  </code></pre>
  
  <p>Thanks,</p>
  
  <p>Anand</p>