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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

o1 = [];
    o2 = [];
    o3 = [];
    
    for (var i = 0; i < 100; i++) {
      o1.push(i)
      o2.push(i)
      o3.push(i)
    }
    Object.freeze(o2);
    Object.seal(o3);
    
    function doAnything(x) { }

Teardown JS

Test cases

Test #1

Title *

Async

Code *for(var key in o1) { doAnything(o1[key]) }

Test #2

Title *

Async

Code *for(var key in o2) { doAnything(o2[key]) }

Test #3

Title *

Async

Code *for(var key in o3) { doAnything(o3[key]) }

Test #4

Title *

Async

Code *

for (var i = 0; i < o2.length; i++) {
  doAnything(o2[i]);
}

Test #5

Title *

Async

Code *

for (var i = 0; i < o1.length; i++) {
  doAnything(o1[i]);
}