title: Getting array of values from jQuery object
body: <p>I have following object:</p>
  
  <pre><code>$("input:checkbox:checked")
  [
  &lt;input class=​"li_checker" type=​"checkbox" category_uid=​"1.3" category_language=​"da"&gt;​, 
  &lt;input class=​"li_checker" type=​"checkbox" category_uid=​"1.3.1" category_language=​"da"&gt;​
  ]
  </code></pre>
  
  <p>If there is any helper in jQuery which allows me to get value of "category_uid" for all elements and returns it as the another array? Expected result:</p>
  
  <pre><code>["1.3", "1.3.1"]
  </code></pre>