No Dependency / Do It Yourself / You Know What You Are Doing UUID generator for Javascript

uuid.js

const v4 = () => {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    const r = Math.trunc(Math.random() * 16);
    const v = c == 'x' ? r : (r & 0x3 | 0x8);
    return v.toString(16);
  });
}

const v7 = () => {
  return 'tttttttt-tttt-7xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    const r = Math.trunc(Math.random() * 16);
    const v = c == 'x' ? r : (r & 0x3 | 0x8);
    return v.toString(16);
  }).replace(/^[t]{8}-[t]{4}/, function() {
    const unixtimestamp = Date.now().toString(16).padStart(12, '0');
    return unixtimestamp.slice(0, 8) + '-' + unixtimestamp.slice(8);
  });
}

console.log(v4());
console.log(v7());

// Also see: https://gist.github.com/fabiolimace/c725349dd34aedc7b69867dabec59c08

OUTPUT:

3eab511b-9876-4967-bbd8-e5d56baacdb1
018c469f-f49e-788c-bce0-a41c9eac9c95