Run results for: UUID Test 3

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:61.0) Gecko/20100101 Firefox/61.0

Browser: Firefox 61

Operating system: Windows

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
old old	106844.4 Ops/sec
new	15775.3 Ops/sec
old crypt	111633.8 Ops/sec
old crypt 2	145212.6 Ops/sec
old meth2 with random	113476.1 Ops/sec

Script Preparation code:

function oldmeth() {
  function chr4 () {
    return Math.random().toString(16).slice(-4);
  }
  return `${chr4() + chr4()}-${chr4()}-${chr4()}-${chr4()}-${chr4()}${chr4()}${chr4()}`;
}

function oldmethcrypto() {
  function getRandom () {
    return crypto.getRandomValues(new Uint32Array(4)).reduce((prev, current) => `${prev.toString(16)}${current.toString(16)}`);
  }
  
  function update4(uuid) {
    const fourIndx = 12;
    
    return `${uuid.slice(0,12)}4${uuid.slice(13)}`;
  }
  function getEight(c) {
    return(c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16);
  }
  function update8(uuid) {
    const eightIndx = 16;
    return `${uuid.slice(0,16)}${getEight(8)}${uuid.slice(17)}`;
  }
  
  function addDashes(uuid) {
    // xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx
    return `${uuid.slice(0,8)}-${uuid.slice(8,12)}-${uuid.slice(12,16)}-${uuid.slice(16,20)}-${uuid.slice(20)}`;
  }
  
  let uuid = getRandom();
  
  uuid = update4(uuid);
  
  uuid = update8(uuid);
  
  uuid = addDashes(uuid);
  
  return uuid;
}


function oldmethcrypto2() {
  function getRandom () {
    return crypto.getRandomValues(new Uint32Array(4)).reduce((prev, current) => `${prev.toString(16)}${current.toString(16)}`);
  }

  function getEight(c) {
    return(c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16);
  }

  let uuid = getRandom();
  return `${uuid.slice(0,8)}-${uuid.slice(8,12)}-4${uuid.slice(13,16)}-${getEight(8)}${uuid.slice(17,20)}-${uuid.slice(20)}`;
}

function newmethrand1() {
  function getRandom (num) {
    let output;
    for(let i = 0; i < Math.ceil(num/8); i++) {
      output = `${output}${Math.random().toString(16).slice(-8)}`;
    }
  
  	return output.slice(num * -1);
  }

  function getEight(c) {
    return(c ^ Math.random().toString(16).slice(-1) & 15 >> c / 4).toString(16);
  }

  let uuid = getRandom(32);
  return `${uuid.slice(0,8)}-${uuid.slice(8,12)}-4${uuid.slice(13,16)}-${getEight(8)}${uuid.slice(17,20)}-${uuid.slice(20)}`;
}

function newmeth() {
  return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c =>
     (c ^ crypto.getRandomValues(new Uint8Array(1))[0] & 15 >> c / 4).toString(16),
  );                                      
}

Tests:

old old
oldmeth();
new
newmeth();
old crypt
oldmethcrypto();
old crypt 2
oldmethcrypto2();
old meth2 with random
newmethrand1();

Run results for: UUID Test 3

UUID speed validation tests

old old

new

old crypt

old crypt 2

old meth2 with random