How andSelf() improves find()

We have seen how the jQuery methods filter() and find() differ. Now we see how to improve find() combining it to another useful method, andSelf(), that works smoothly with it.

I want to draw a box around my unsorted lists, and also around the included links. To do that, I can write this JavaScript oneliner:

$('ul').find('a').andSelf().css('border', '1px solid blue');

I select all the ULs in my document, than I find all the included A elements, and I join the two sets by calling andSelf(). Finally I call css() specifying that I want to put a thin blue line border around them.