title: What's the jQuery way of constantly listening to list count and modifying behaviour accordingly?
body: <p>So let's say there's an element in my DOM tagged with the id <code>hide_me</code>.</p>
  
  <p>When <code>$("ul").length</code> is 0, I want <code>hide_me</code> to be hidden, and when it's greater than that, I want it to be available.</p>
  
  <p><code>li</code> elements get added and removed from the DOM dynamically. </p>
  
  <p>How can I implement something like this?</p>