jquery addClass() to first position of multiple classes

Question

what it does:

<p class="foo"></p>
$('p').addClass('bar');

output:

<p class="foo bar"></p>

what i need:

<p class="bar foo"></p>

So is it possible to add a class to an element to the first position?

edit (context): theres a split function on the last class right now. if another class is added its appended to the second split array as well.

Answer 1

 (function($) {

    jQuery.fn.extend({
        prependClass: function(newClasses) {
            return this.each(function() {
                var currentClasses = $(this).prop("class");
                $(this).removeClass(currentClasses).addClass(newClasses + " " + currentClasses);
            });
        }
    });

})(jQuery);