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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 src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js">
</script>
<script>
  var a = $('*').get(),
      e;
</script>

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

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

Test #2

Title *

Async

Code *

var i = a.length - 1;

while (e = a[i--]) {
  $(e)
};

Test #3

Title *

Async

Code *

for (var i = a.length; i--;) {
  e = $(a[i]);
}

Test #4

Title *

Async

Code *

var i = a.length;
while (i--) {
  e = $(a[i]);
}

Test #5

Title *

Async

Code *

for (var i = a.length; i -= 1;) {
  e = $(a[i]);
}