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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

Teardown JS

Test cases

Test #1

Title *

Async

Code *for (var i = 0, a = []; i < 100; i++) a.push(0);

Test #2

Title *

Async

Code *for (var i = 0, a = new Array(100); i < 100;) a[i++] = 0;

Test #3

Title *

Async

Code *[].slice.call(new Uint8Array(100));

Test #4

Title *

Async

Code *

for (var i = 100, a = [], add = [0]; i; i >>=1) {
    if (i & 1) a.push.apply(a, add);
    add.push.apply(add, add);
}

Test #5

Title *

Async

Code *var a = Array.apply(null, new Array(100)).map(Number.prototype.valueOf, 0);

Test #6

Title *

Async

Code *var a = new Array(100 + 1).join('0').split('').map(parseFloat);

Test #7

Title *

Async

Code *var a = Array(100).fill(0);