Run results for: UUID V4 Crypto vs Math

Run details:

User agent: Mozilla/5.0 (Linux; Android 11; SM-N975U) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.93 Mobile Safari/537.36

Browser: Chrome Mobile 88

Operating system: Android

Device Platform: Mobile

Date tested: 3 years ago

Test name	Executions per second
math	67791.1 Ops/sec
crypto	40715.9 Ops/sec
crypto Number to String	51656.8 Ops/sec

Script Preparation code:

function uuidCrypto() {
  let bytes = window.crypto.getRandomValues(new Uint8Array(32));
  const randomBytes = () => (bytes = bytes.slice(1)) && bytes[0];

  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, c => (c ^ randomBytes() & 15 >> c / 4).toString(16))
}

function uuidMath() {
				return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, c => {
					const r = (Math.random() * 16) | 0;
					const v = c === 'x' ? r : (r & 0x3) | 0x8;
					return v.toString(16);
				});
}

function uuidCryptoNumber() {
  let bytes = window.crypto.getRandomValues(new Uint8Array(32));
  const randomBytes = () => (bytes = bytes.slice(1)) && bytes[0];

  return ([1e7] + -1e3 + -4e3 + -8e3 + -1e11).replace(/[018]/g, c => 
      (c ^ randomBytes() & 15 >> c / 4).toString(16)
    );
}

Tests:

math
uuidMath()
crypto
uuidCrypto()
crypto Number to String
uuidCryptoNumber()

Run results for: UUID V4 Crypto vs Math

Crypto.getRandomValues vs Math.random

math

crypto

crypto Number to String