decibel-meter/src/uuid.js

Decibel meter for detecting noise levels from microphone via Web Audio API

export default function uuid() {
  let d = performance.now();
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    let r = (d + Math.random() * 16) % 16 | 0
    d = Math.floor(d/16);
    return (c=='x' ? r : (r&0x3|0x8)).toString(16);
  })
}