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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 arr = [],
        i,
        obj = {};
    for(i = 0; i < 10000; i += 1) {
        var o = {payload:i};
        arr.push(o);
        obj[i] = o;
    }

Teardown JS

Test cases

Test #1

Title *

Async

Code *

var sum = 0;
for (var x=0; x<arr.length; ++x) {
    sum += arr[x].payload
}

Test #2

Title *

Async

Code *

var sum = 0;
for (var x in obj) {
    sum += obj[x].payload;
}

Test #3

Title *

Async

Code *

var sum = 0;
for (var x=0; x<10000; ++x) {
    sum += obj[x].payload
}

Test #4

Title *

Async

Code *

var sum = 0;
var keys = Object.keys(obj);
for (var x=0, l=keys.length; x<l; ++x) {
    sum += obj[keys[x]].payload
}