jQuery sort clothing sizes in select box for shopware configurator articles

jQuery sorting clothing sizes

$(function() {

            var sizes  = ["XS", "S", "M", "L", "XL", "2XL", "3XL", "4XL"],
                    select = $('.configurator--form select[name="group[2]"]');

            $('option', select).sort(function (a, b) {
                if(isNaN($(a).text().trim())){
                    return sizes.indexOf($(a).text().trim()) - sizes.indexOf($(b).text().trim());
                }else{
                    return $(a).text() > $(b).text() ? 1 : $(a).text() < $(b).text() ? -1 : 0;
                }

            }).appendTo(select);

        });