SimpleUUID JS

simpleuuid.js

// https://gist.github.com/jed/982883
// https://github.com/chriso/validator.js/blob/master/validator.js#L774-L787
// https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Proxy

var uuidv4 = new Proxy(function(_removeDash){
	function b(a){return a?(a^Math.random()*16>>a/4).toString(16):([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g,b)}
	return _removeDash ? b().replace(/-/g, '') : b();
}, {
    get(target, name) {
		return {
			validate: function(_uuid){
				var uuid = {
					3: /^[0-9A-F]{8}-[0-9A-F]{4}-3[0-9A-F]{3}-[0-9A-F]{4}-[0-9A-F]{12}$/i,
					4: /^[0-9A-F]{8}-[0-9A-F]{4}-4[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i,
					5: /^[0-9A-F]{8}-[0-9A-F]{4}-5[0-9A-F]{3}-[89AB][0-9A-F]{3}-[0-9A-F]{12}$/i,
					all: /^[0-9A-F]{8}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{4}-[0-9A-F]{12}$/i
				};
				if (typeof _uuid !== 'string') {
					throw new TypeError('This library (validator.js) validates strings only');
				}
				var version = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'all';
				var pattern = uuid[version];
				return pattern.test(_uuid);
			}
		}[name];
    }
});

// usage

console.log(uuidv4());
// uuidv4, without dash

console.log(uuidv4(true));
// uuidv4, without dash

console.log(uuidv4.validate(uuidv4()));
// tests across v3, v4 & v5
// true, since it matches v4
// 

console.log(uuidv4.validate(uuidv4(true)));
// false, since dashes are expected.

console.log(uuidv4.validate(uuidv4(), '4'));
// specifically tests against v4
// true, checks for v4.
// you can also use 3 or 5. valid values are 3, 4 & 5


console.log(uuidv4.validate(uuidv4(), '3'));
// false of course.