title: How to get an array of attribute value from elements in a jQuery object
body: <p>I use a custom attribute in elements with my own class. I'm trying to return the value of custom attribute for all elements of the class.  </p>
  
  <p>I used jQuery to find the elements by class, and jQuery places the object in an array.</p>
  
  <pre><code>var tabs = $('li.tab_item');
  </code></pre>
  
  <p>Now that I'd have the objects in an array, I would like to return the value for the custom attribute for all the array's members. </p>
  
  <p>How can this be done?</p>