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

for -for

Benchmark created by 辛文韬 on April 13, 2017

Preparation HTML

<script>
var a = [];
for(var i = 0; i < 1000000; i++) {
	a.push(1);
}
</script>

Test runner

Ready to run.

Test Ops/sec

for use len

Testing in
Test	Ops/sec
for use len	`var total = 0; for (var i = 0, len = a.length; i < len; i++) { total += a[i]; }`	ready
for use a.length	`var total = 0; for (var i = 0; i < a.length; i++) { total += a[i]; }`	ready
for reverse	`var total = 0; for (var i = a.length - 1; i > -1; i--) { total += a[i]; }`	ready

var total = 0;
for (var i = 0, len = a.length; i < len; i++)
{
  total += a[i];
}

ready

for use a.length

var total = 0;
for (var i = 0; i < a.length; i++)
{
  total += a[i];
}

ready

for reverse

var total = 0;
for (var i = a.length - 1; i > -1; i--)
{
  total += a[i];
}

ready

Revisions

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

Revision 1: published by 辛文韬 on April 13, 2017