DOM detecting jQ

(function(window, $, undefined){

    /**
     * Hooks into a given method
     *
     * @param method
     * @param fn
     */
    $.fn.hook = function (method, fn) {
        var def = $.fn[method];

        if (def) {
            $.fn[method] = function() {
                var r = def.apply(this, arguments); //original method
                fn(this, method, arguments); //injected method
                return r;
            }
        }
    }

})(window, jQuery);