Moving items between two list but filtering ones that already exists 
<p>I have a web page that contains two lists (Unorders lists), I have to move items from list 1 to list 2 but to filter out items that are already in list 2.
I'm using JQuery as js library. I know I can select all items to be moved to list 2, loop one by one and check if alredy exists in list 2, but was wandering if there is a way to do it in less lines of code using filter, :not, :has ...
Here is a html structure:</p>

<pre><code>  &lt;ul id="ulList_1"&gt;
     &lt;li&gt;
        &lt;a href="#"&gt;item 1&lt;/a&gt;
     &lt;/li&gt;
     &lt;li&gt;
        &lt;a href="#"&gt;item 2&lt;/a&gt;
     &lt;/li&gt;
  &lt;/ul&gt;

  &lt;ul id="ulList_2"&gt;
     &lt;li&gt;
        &lt;a href="#"&gt;item 2&lt;/a&gt;
     &lt;/li&gt;
     &lt;li&gt;
        &lt;a href="#"&gt;item 3&lt;/a&gt;
     &lt;/li&gt;
     &lt;li&gt;
        &lt;a href="#"&gt;item 4&lt;/a&gt;
     &lt;/li&gt;      
 &lt;/ul&gt;
</code></pre>

<p>So, in this scenario I want to select only "item 1" since "item 2" already exists in "ulList_2", and append it to list 2
Thanks</p>
