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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 x = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9];
    var y = [1, 2, 3, 4, 5, 6, 7, 8, 9, 0];
    for (var i = 0; i < 8; i += 1) {
       x = x.concat(x);
    }
    var arrPush = Array.prototype.push;

Teardown JS

Test cases

Test #1

Title *

Async

Code *

var a = x.slice(0),
    b = y.slice(0);

a = a.concat(b);

Test #2

Title *

Async

Code *

var a = x.slice(0),
    b = y.slice(0);

Array.prototype.push.apply(a, b);

Test #3

Title *

Async

Code *

var a = x.slice(0),
    b = y.slice(0),
    i = 0,
    c = b.length;

for (; i < c; ++i) {
  a.push(b[i]);
}

Test #4

Title *

Async

Code *

var a = x.slice(0),
    b = y.slice(0);

arrPush.apply(a, b);