jsPerf.app is an online JavaScript performance benchmark test runner & jsperf.com mirror. It is a complete rewrite in homage to the once excellent jsperf.com now with hopefully a more modern & maintainable codebase.

jsperf.com URLs are mirrored at the same path, e.g:

https://jsperf.com/negative-modulo/2

Can be accessed at:

https://jsperf.app/negative-modulo/2

Random string generation test

Benchmark created by Hawkeyeaz1 on July 18, 2012

Setup

var str = "", array = new Uint8Array(200), lu = [ '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F' ];

Test runner

Ready to run.

Test Ops/sec

str += Number...

Testing in
Test	Ops/sec
str += Number...	`for(i = 0; i < 100; i++) str += Number(Math.random() * 16).toString(16);`	ready
lookup and Uint8Array	`for(i = 0; i < 100; i++) array[i] = lu[Math.random() * 16] str = String.fromCharCode.apply(null, array);`	ready
string + lookup	`for(i = 0; i < 100; i++) str += lu[Math.random() * 16];`	ready

for(i = 0; i < 100; i++) str += Number(Math.random() * 16).toString(16);

ready

lookup and Uint8Array

for(i = 0; i < 100; i++) array[i] = lu[Math.random() * 16]
str = String.fromCharCode.apply(null, array);

ready

string + lookup

for(i = 0; i < 100; i++) str += lu[Math.random() * 16];

ready

Revisions

You can edit these tests or add more tests to this page by appending /edit to the URL.

Revision 1: published by Hawkeyeaz1 on July 18, 2012