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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

const format =  {
    weekday: 'long',
    month: 'long',
    day: '2-digit',
};
const now = new Date();

const sharedDateTimeFormat = new Intl.DateTimeFormat('en-US', format);

const sharedDateTimeZeroFormat = new Intl.DateTimeFormat('en-US');

Teardown JS

Test cases

Test #1

Title *

Async

Code *

const dateTimeFormat = new Intl.DateTimeFormat('en-US', format);
dateTimeFormat.format(now);

Test #2

Title *

Async

Code *now.toLocaleTimeString('en-US', format)

Test #3

Title *

Async

Code *sharedDateTimeFormat.format(now);

Test #4

Title *

Async

Code *now.toLocaleTimeString('en-US')

Test #5

Title *

Async

Code *sharedDateTimeZeroFormat.format(now)