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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 src="//cdnjs.cloudflare.com/ajax/libs/underscore.js/1.3.3/underscore-min.js">
</script>

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

var foo = (function(x) {
  return this + x;
}).bind(1);
for (var i = 0; i < 1000; ++i)
  foo(i);

Test #2

Title *

Async

Code *

var foo = jQuery.proxy(function(x) {
  return this + x;
}, 1);
for (var i = 0; i < 1000; ++i)
  foo(i);

Test #3

Title *

Async

Code *

var foo = _.bind(function(x) {
  return this + x;
}, 1);
for (var i = 0; i < 1000; ++i)
  foo(i);

Test #4

Title *

Async

Code *

var bar = function(x) {
  return this + x;
};
var foo = function(x) {
  bar.call(1, x);
}
for (var i = 0; i < 1000; ++i)
  foo(i);