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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)

Setup JS

var value = {
    v1: 1,
    v2: 2,
    v3: 3
  }
  var values = [];
  var fields = [];
  var size = 25000;
  for (var i = 0; i < size; i++) values[i] = value;

Teardown JS



            fields = [];

Test cases

Test #1

Title *

Async

Code *for (var i = 0; i < size; i++) fields[i] = value;

Test #2

Title *

Async

Code *

fields = values.map(function(value) {
  return value;
});

Test #3

Title *

Async

Code *

fields = new Array(size);
for (var i = 0; i < size; i++) fields[i] = value;

Test #4

Title *

Async

Code *for (var i = 0; i < size; i++) fields.push(value);

Test #5

Title *

Async

Code *

var i = 0;
while (i < size) {
  fields[i] = value;
  i++
}