title: Sort by object key in descending order on Javascript/underscore
body: <p>I have the following object array where the key is the date in UTC format.</p>
  
  <pre><code>    Array = [{1436796000000:["Task1","Task2"],
           1437400800000:["Task4","Task8"],
           1436968800000: ["Task3","Task2"],
           1436882400000:["Task5","Task6"]}]
  </code></pre>
  
  <p>I want to sort this array object by key in descending order. So the expected output will be following like the latest date will come first.</p>
  
  <pre><code>    Array = [{1437400800000:["Task4","Task8"],
               1436968800000: ["Task3","Task2"],
               1436882400000:["Task5","Task6"],
               1436796000000:["Task1","Task2"]}]
  </code></pre>
  
  <p>How can I do this in javascript or using underscore.js?</p>