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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 a = 'a';
    var c = ('' + Math.random().toFixed(100));

Teardown JS

Test cases

Test #1

Title *

Async

Code *var foo = a + 'b' + c + 'd';

Test #2

Title *

Async

Code *

var foo = a;
foo += 'b';
foo += c;
foo += 'd';

Test #3

Title *

Async

Code *

var foo = a;
foo = foo + 'b';
foo = foo + c;
foo = foo + 'd';

Test #4

Title *

Async

Code *var foo = [a, 'b', c, 'd'].join('');

Test #5

Title *

Async

Code *var foo = "{{a}}b{{c}}d".replace(/{{a}}/, a).replace(/{{c}}/, c);

Test #6

Title *

Async

Code *

var foo = a;
(foo += 'b', foo += c, foo += 'd');