Run results for: UUID Generation 2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36

Browser: Chrome 89

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Jeff Ward v7	374248.7 Ops/sec
Jon Surrell (not real UUID)	250955.2 Ops/sec
Broofa (new)	11169.0 Ops/sec
Broofa (old)	111728.0 Ops/sec
My Test	254697.7 Ops/sec
Jeff Ward v7 window.crypto	185674.3 Ops/sec
My Test v2 (array.join)	214019.4 Ops/sec
URL.createObjectURL	2870.4 Ops/sec
NPM uuid	782276.8 Ops/sec

HTML Preparation code:

<script src="https://unpkg.com/uuid@latest/dist/umd/uuidv4.min.js"></script>

Script Preparation code:

function uuidByBlob() {
  var url = URL.createObjectURL(new Blob());
  var uuid = url.toString();
  URL.revokeObjectURL(url);
  return uuid.substr(uuid.lastIndexOf('/') + 1);
}

// Jeff Ward v7
var lut = []; for (var i=0; i<256; i++) { lut[i] = (i<16?'0':'')+(i).toString(16); }
function e7()
{
  var d0 = Math.random()*0xffffffff|0;
  var d1 = Math.random()*0xffffffff|0;
  var d2 = Math.random()*0xffffffff|0;
  var d3 = Math.random()*0xffffffff|0;
  return lut[d0&0xff]+lut[d0>>8&0xff]+lut[d0>>16&0xff]+lut[d0>>24&0xff]+'-'+
    lut[d1&0xff]+lut[d1>>8&0xff]+'-'+lut[d1>>16&0x0f|0x40]+lut[d1>>24&0xff]+'-'+
    lut[d2&0x3f|0x80]+lut[d2>>8&0xff]+'-'+lut[d2>>16&0xff]+lut[d2>>24&0xff]+
    lut[d3&0xff]+lut[d3>>8&0xff]+lut[d3>>16&0xff]+lut[d3>>24&0xff];
}

// Jeff Ward v7 window.crypto
var lut = []; for (var i=0; i<256; i++) { lut[i] = (i<16?'0':'')+(i).toString(16); }
function e7_crypto()
{
  var d = new Uint32Array(4);
  window.crypto.getRandomValues(d);
  return lut[d[0]&0xff]+lut[d[0]>>8&0xff]+lut[d[0]>>16&0xff]+lut[d[0]>>24&0xff]+'-'+
    lut[d[1]&0xff]+lut[d[1]>>8&0xff]+'-'+lut[d[1]>>16&0x0f|0x40]+lut[d[1]>>24&0xff]+'-'+
    lut[d[2]&0x3f|0x80]+lut[d[2]>>8&0xff]+'-'+lut[d[2]>>16&0xff]+lut[d[2]>>24&0xff]+
    lut[d[3]&0xff]+lut[d[3]>>8&0xff]+lut[d[3]>>16&0xff]+lut[d[3]>>24&0xff];
}


// Broofa (new)
function uuidv4_new() {
  return ([1e7]+-1e3+-4e3+-8e3+-1e11).replace(/[018]/g, c =>
    (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16)
  )
}

// Broofa (old)
function uuidv4_old() {
  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);
  });
}


// Jon Surrell (not real UUID)
function guid() {
  function s4() {
    return Math.floor((1 + Math.random()) * 0x10000)
      .toString(16)
      .substring(1);
  }
  return s4() + s4() + '-' + s4() + '-' + s4() + '-' +
    s4() + '-' + s4() + s4() + s4();
}

// My Test
var UUID = (new function() {
  this._lut = []; for (var i = 0; i < 256; i++) {
    this._lut[i] = (i < 16 ? '0' : '') + (i).toString(16);
  };

  this._format = function (rarr) {
    return '' +
    this._lut[rarr[0]       & 0xff]        + this._lut[rarr[0] >>  8 & 0xff] + this._lut[rarr[0] >> 16 & 0xff] + this._lut[rarr[0] >> 24 & 0xff] + '-' +
    this._lut[rarr[1]       & 0xff]        + this._lut[rarr[1] >>  8 & 0xff] + '-' +
    this._lut[rarr[1] >> 16 & 0x0f | 0x40] + this._lut[rarr[1] >> 24 & 0xff] + '-' +
    this._lut[rarr[2]       & 0x3f | 0x80] + this._lut[rarr[2] >>  8 & 0xff] + '-' +
    this._lut[rarr[2] >> 16 & 0xff]        + this._lut[rarr[2] >> 24 & 0xff] +
    this._lut[rarr[3]       & 0xff]        + this._lut[rarr[3] >>  8 & 0xff] +
    this._lut[rarr[3] >> 16 & 0xff]        + this._lut[rarr[3] >> 24 & 0xff];
  };

  this._getRandomness = function () {
    if ('crypto' in window && 'Uint32Array' in window) {
      var dvals = new Uint32Array(4);
      window.crypto.getRandomValues(dvals);
      return dvals
    }
    return [
      Math.random() * 0x100000000 >>> 0,
      Math.random() * 0x100000000 >>> 0,
      Math.random() * 0x100000000 >>> 0,
      Math.random() * 0x100000000 >>> 0,
    ];
  };

  this.generate = function () {
    return this._format(this._getRandomness());
  };
}());

var UUID2 = (new function () {
  this._lut = []; for (var i = 0; i < 256; i++) {
    this._lut[i] = (i < 16 ? '0' : '') + (i).toString(16);
  };

  this._format = function (rarr) {
    return [
      this._lut[rarr[0]       & 0xff]        , this._lut[rarr[0] >>  8 & 0xff] , this._lut[rarr[0] >> 16 & 0xff] , this._lut[rarr[0] >> 24 & 0xff] , '-' ,
      this._lut[rarr[1]       & 0xff]        , this._lut[rarr[1] >>  8 & 0xff] , '-' ,
      this._lut[rarr[1] >> 16 & 0x0f | 0x40] , this._lut[rarr[1] >> 24 & 0xff] , '-' ,
      this._lut[rarr[2]       & 0x3f | 0x80] , this._lut[rarr[2] >>  8 & 0xff] , '-' ,
      this._lut[rarr[2] >> 16 & 0xff]        , this._lut[rarr[2] >> 24 & 0xff] ,
      this._lut[rarr[3]       & 0xff]        , this._lut[rarr[3] >>  8 & 0xff] ,
      this._lut[rarr[3] >> 16 & 0xff]        , this._lut[rarr[3] >> 24 & 0xff]
    ].join('')
  };

  this._getRandomness = function () {
    if ('crypto' in window && 'Uint32Array' in window) {
      var dvals = new Uint32Array(4);
      window.crypto.getRandomValues(dvals);
      return dvals
    }
    return [
      Math.random() * 0x100000000 >>> 0,
      Math.random() * 0x100000000 >>> 0,
      Math.random() * 0x100000000 >>> 0,
      Math.random() * 0x100000000 >>> 0,
    ];
  };

  this.generate = function () {
    return this._format(this._getRandomness());
  };
}());

Tests:

Jeff Ward v7
e7();
Jon Surrell (not real UUID)
guid();
Broofa (new)
uuidv4_new();
Broofa (old)
uuidv4_old();
My Test
UUID.generate();
Jeff Ward v7 window.crypto
e7_crypto();
My Test v2 (array.join)
UUID2.generate();
URL.createObjectURL
uuidByBlob()
NPM uuid
uuidv4()

Run results for: UUID Generation 2

Compare NPM module uuid and URL.createObjectURL.

Jeff Ward v7

Jon Surrell (not real UUID)

Broofa (new)

Broofa (old)

My Test

Jeff Ward v7 window.crypto

My Test v2 (array.join)

URL.createObjectURL

NPM uuid