Gist for javascript function that creates universally unique identifier (UUID), which is a 128-bit number used to identify information in computer systems.

uuid.demo.js

console.log(uuid());

uuid.js

function uuid() {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
    return v.toString(16);
  });
}