Menu

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

Teardown JS

Test cases

Test #1

Title *

Async

Code *

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

Test #2

Title *

Async

Code *

'use strict';
a === undefined;
b === undefined;
c === undefined;
d === undefined;
e === undefined;

Test #3

Title *

Async

Code *

'use strict';
a === u;
b === u;
c === u;
d === u;
e === u;

Test #4

Title *

Async

Code *

'use strict';
a === void 0;
b === void 0;
c === void 0;
d === void 0;
e === void 0;

Test #5

Title *

Async

Code *

'use strict';
var un;
a === un;
b === un;
c === un;
d === un;
e === un;

Test #6

Title *

Async

Code *

'use strict';
var un = void 0;
a === un;
b === un;
c === un;
d === un;
e === un;