Discovering if any element has any class in jQuery

Question

I have inherited some jQuery and HTML and need to find out if any of the HTML elements have a class name of any value. I've read around a few threads and Googled but can't find anything useful. So in pseudo-code what I'd like is:

Loop through all HTML elements

If any of them have any class at all:
    Get their class name as a string

Hoping that makes sense!

Answer 1

Try:

$('*').each(function() {
    if ($(this).hasClass()) {
        var class_name = $(this).attr('class');
        // do something
    }
});

Why you would want to do this, I have no idea. It is very inefficient