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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 = [];
  for (var i = 0; i < 10; i++) {
    arr[i] = Math.random();
  }

Teardown JS

Test cases

Test #1

Title *

Async

Code *

for (var i = 0, len = arr.length; i < len; i++) {
  arr[i] *= 2;
}

Test #2

Title *

Async

Code *

for (var i = 0, len = arr.length; i < len; ++i) {
  arr[i] *= 2;
}

Test #3

Title *

Async

Code *

for (var i = arr.length-1; i >= 0; i--) {
  arr[i] *= 2;
}

Test #4

Title *

Async

Code *

for (var i = arr.length-1; i == 0; i--) {
  arr[i] *= 2;
}

Test #5

Title *

Async

Code *

for (var i = arr.length-1; i != -1; --i) {
  arr[i] *= 2;
}

Test #6

Title *

Async

Code *

for (var i = -arr.length; i == 0; ++i) {
  arr[-i] *= 2;
}

Test #7

Title *

Async

Code *

var len = arr.length;
while (len--) {
  arr[len] *= 2;
}

Test #8

Title *

Async

Code *

var len = -arr.length;
while (len++) {
  arr[-len] *= 2;
}

Test #9

Title *

Async

Code *

for (var i = 0; i < arr.length; i++) {
  arr[-i] *= 2;
}

Test #10

Title *

Async

Code *

var len = arr.length;
for (var i = len ; i--;) {
  arr[-i] *= 2;
}

Test #11

Title *

Async

Code *

for (var i = arr.length-1; i === 0; i--) {
  arr[i] *= 2;
}

Test #12

Title *

Async

Code *

for (var i = arr.length-1; i < 0; i--) {
  arr[i] *= 2;
}

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