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

push vs unshift (v2)

Revision 2 of this benchmark created by Jonas Fischer on March 31, 2011

Setup

var a;
  
  
  Benchmark.prototype.setup = function() {
   a = [];
  }

Test runner

Ready to run.

Testing in
Test		Ops/sec
push	`a.push('x');`	ready
array empty ...	`if (a != []) a = [];`	ready
unshift	`a.unshift('x');`	ready

Revisions

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

Revision 2: published by Jonas Fischer on March 31, 2011