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

Pad perf

Benchmark created by Anony Anoymou on April 7, 2016

Preparation HTML

<script>
  var h = 5;
</script>

Test runner

Ready to run.

Test Ops/sec

Concatenation

Testing in
Test	Ops/sec
Concatenation	`let str = h.toString(); while (str.length < 5) { str = "0" + str; }`	ready
Array	`let str = h.toString(); let needToAdd = Math.max(0, 5 - str.length); var pad = new Array(needToAdd + 1).join("0"); return pad + str;`	ready

let str = h.toString();
while (str.length < 5) {
  str = "0" + str;
}

ready

Array

let str = h.toString();
let needToAdd = Math.max(0, 5 - str.length);
var pad = new Array(needToAdd + 1).join("0");
return pad + str;

ready

Revisions

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

Revision 1: published by Anony Anoymou on April 7, 2016