var s4 = function () {
    return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1);
};

exports.newGuid = function () {
    return (s4() + s4() + "-" + s4() + "-" + s4() + "-" + s4() + "-" + s4() + s4() + s4());
};