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

hashtable creation

Benchmark created by Tolga Tezel on November 3, 2011

Description

performance of different ways to implement hashtable of size 2^5

Test runner

Ready to run.

Test Ops/sec

object (optimized 'for')

Testing in
Test	Ops/sec
object (optimized 'for')	`var len = 1 << 5 - 1 , i = 0 , hashtable = {}; for (; i != len;) { hashtable[i++] = null; }`	ready
array (optimized 'for')	`var len = 1 << 5 - 1 , i = 0 , hashtable = []; for (; i != len;) { hashtable[i++] = null; }`	ready
object (while)	`var len = 1 << 5 , hashtable = []; while(len--) { hashtable[len] = null; }`	ready

var len = 1 << 5 - 1
  , i = 0
  , hashtable = {};

for (; i != len;) {
  hashtable[i++] = null;
}

ready

array (optimized 'for')

var len = 1 << 5 - 1
  , i = 0
  , hashtable = [];

for (; i != len;) {
  hashtable[i++] = null;
}

ready

object (while)

var len = 1 << 5
  , hashtable = [];

while(len--) {
  hashtable[len] = null;
}

ready

Revisions

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

Revision 1: published by Tolga Tezel on November 3, 2011