Select the last word in an element & wrap it with a span tag

jQuery(document).ready(function($){
    $('.site-name a').html(function(){   
        // separate the text by spaces
        var text= $(this).text().split(' ');
        // drop the last word and store it in a variable
        var last = text.pop();
        // join the text back and if it has more than 1 word add the span tag
        // to the last word
        return text.join(" ") + (text.length > 0 ? ' <span class="last">'+last+'</span>' : last);
    });
});