random-uuid-v4/uuidv4.js

A lightweight version 4 UUID generator.

/**
 *
 * This function was taken from a stackoverflow answer:
 *
 * http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript
 *
 * Many thanks to:
 *
 * Briguy37 (http://stackoverflow.com/users/508537/briguy37)
 * broofa (http://stackoverflow.com/users/109538/broofa)
 *
 */

module.exports = function() {
    var d = new Date().getTime();
    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
        var r = (d + Math.random()*16)%16 | 0;
        d = Math.floor(d/16);
        return (c=='x' ? r : (r&0x3|0x8)).toString(16);
    });
};