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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

Test case details

Title *

Description
(Markdown syntax is allowed)

Preparation Code

Preparation HTML
(this will be inserted in the <body> of a valid HTML5 document in standards mode)
(useful when testing DOM operations or including libraries)

<script>
  var data = {};
  
  for (var i = 0; i < 10000; i++) {
  
   data[i] = {
      name: 'user ' + i
   };
  
  }
</script>

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

for (var key in data) {
  data[key];
}

Test #2

Title *

Async

Code *

Object.keys(data).forEach(function(element, index, array) {
  data[element];
});

Test #3

Title *

Async

Code *

var keys = Object.keys(data);
var len = keys.length;
var i = 0;

while (i < len) {
  data[i];
  i++;
}

Test #4

Title *

Async

Code *

var keys = Object.keys(data);
var len = keys.length;
var i;

for (i = 0; i < len; i++) {
  data[i];
}

Test #5

Title *

Async

Code *

var keys = Object.keys(data);
var len = keys.length;

while (len--) {
  data[i];
}

Test #6

Title *

Async

Code *

var keys = Object.keys(data),
  i = keys.length;

for (; --i;) {
  data[i];
}