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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 obj = {
      a: 0,
      b: 1,
      c: 2,
      d: 3,
      e: 4,
      f: 5,
      g: 6,
      h: 7,
      i: 8,
      j: 9
    };
    var sum = 0;

Teardown JS


    console.log(sum);

Test cases

Test #1

Title *

Async

Code *

var keys = Object.keys(obj);
for (var i = 0; i < keys.length; i++) {
  sum += obj[keys[i]];
}

Test #2

Title *

Async

Code *

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

Test #3

Title *

Async

Code *

var keys = Object.keys(obj);
keys.forEach(function(key) {
  sum += obj[key];
});

Test #4

Title *

Async

Code *

for (var key in obj) {
  if (obj.hasOwnProperty(key)) {
    sum += obj[key];
  }
}

Test #5

Title *

Async

Code *

for (var key in obj) {
  sum += obj[key];
}