title: Sort array of objects by single key with date value
body: <p>I have an array of objects with several key value pairs, and I need to sort them based on 'updated_at':</p>
  
  <pre><code>[
      {
          "updated_at" : "2012-01-01T06:25:24Z",
          "foo" : "bar"
      },
      {
          "updated_at" : "2012-01-09T11:25:13Z",
          "foo" : "bar"
      },
      {
          "updated_at" : "2012-01-05T04:13:24Z",
          "foo" : "bar"
      }
  ]
  </code></pre>
  
  <p>What's the most efficient way to do so?</p>