var ID = function () {
  // Math.random should be unique because of its seeding algorithm.
  // Convert it to base 36 (numbers + letters), and grab the first 9 characters
  // after the decimal.
  return '_' + Math.random().toString(36).substr(2, 9);
};

Math.random().toString(36).slice(2);

function uuidv4() {
  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);
  });
}

console.log(uuidv4());

function randomId(): string {
  const uint32 = window.crypto.getRandomValues(new Uint32Array(1))[0];
  return uint32.toString(16);
}

var uniq = 'id' + (new Date()).getTime();

/* unique id generator javascript */

const uuid = () => {
  const head = Date.now().toString();
  const tail = Math.random().toString().substr(2)
  
  return head + tail
}

uuid();