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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 JSvar a = 1, b = true, c = "c", d = [], e = {}, u;

Teardown JS

Test cases

Test #1

Title *

Async

Code *

typeof a === 'undefined';
typeof b === 'undefined';
typeof c === 'undefined';
typeof d === 'undefined';
typeof e === 'undefined';

Test #2

Title *

Async

Code *

a === undefined;
b === undefined;
c === undefined;
d === undefined;
e === undefined;

Test #3

Title *

Async

Code *

a === u;
b === u;
c === u;
d === u;
e === u;

Test #4

Title *

Async

Code *

a === void 0;
b === void 0;
c === void 0;
d === void 0;
e === void 0;

Test #5

Title *

Async

Code *

typeof(a) === undefined;
typeof(b) === undefined;
typeof(c) === undefined;
typeof(d) === undefined;
typeof(e) === undefined;