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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="//underscorejs.org/underscore-min.js"></script><script src="//ajax.googleapis.com/ajax/libs/jquery/1/jquery.min.js"></script>

Setup JS

var foo = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30];
    
    var bar = [1, 3, 4, 5, 6, 7, 8, 9, 11, 12, 13, 14, 15, 16, 18, 19, 20, 21, 22, 24, 26, 27, 28, 29, 30];

Teardown JS

Test cases

Test #1

Title *

Async

Code *

var baz = [];

foo.forEach(function(key) {
    if (-1 === bar.indexOf(key)) {
        baz.push(key);
    }
}, this);

Test #2

Title *

Async

Code *

var bar2 = {}, baz = [];

bar.forEach(function(key) {
  bar2[key] = true;
}, this);

foo.forEach(function(key) {
    if (!bar2[key]) {
        baz.push(key);
    }
}, this);

Test #3

Title *

Async

Code *

var baz = [];

$.each(foo, function(key) {
    if (-1 === bar.indexOf(key)) {
        baz.push(key);
    }
});

Test #4

Title *

Async

Code *var baz = _.difference(foo, bar);