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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 map = new Map();
    var obj1 = Object.create(null);
    var obj2 = {};
    
    for (var i = 0; i < 1000; i++) {
       var key = '' + Math.random(), val = '' + Math.random();
       
       map.set(key, val);
       obj1[key] = val;
       obj2[key] = val;
    }

Teardown JS

Test cases

Test #1

Title *

Async

Code *

var buf = '';
for (var key in obj1) {
    buf += obj1[key];
}

Test #2

Title *

Async

Code *

var buf = '';
for (var key in obj2) {
    buf += obj2[key];
}

Test #3

Title *

Async

Code *

var buf = '';
var keys = map.keys();

for (var key of keys) {
    buf += map.get(key);
}

Test #4

Title *

Async

Code *

var buf = '';
var vals = map.values();

for (var val of vals) {
    buf += val;
}

Test #5

Title *

Async

Code *

var buf = '';

map.forEach(function (key, val) {
    buf += val;
});