how to take last child of parent in jquery code example

Example: jquery last child

<ul>
  <li>list item 1</li>
  <li>list item 2</li>
  <li>list item 3</li>
  <li>list item 4</li>
  <li>list item 5</li>
</ul>
<script>
  //in all the group you can find the last item with .last() function
  $( "li" ).last().css( "background-color", "red" );
</script>