create guid (uuid) in ES6, JS. Ref: http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript

uuid-es6.js

const uuid = function () {
	var d = new Date().getTime();
	var uuid = '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 & 0x7) | 0x8).toString(16);
	});
  
	return uuid;
};

uuid.js

'use strict';

var uuid = function uuid() {
	var d = new Date().getTime();
	var uuid = '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 & 0x7 | 0x8).toString(16);
	});

	return uuid;
};

#see http://stackoverflow.com/questions/105034/how-to-create-a-guid-uuid-in-javascript