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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)

<script>
  // Populate the base array
  var arr = [];
  for (var i = 0; i < 1000; i++) {
    arr[i] = i;
  }
</script>

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

for (var i = 0; i < arr.length; i++) {
  var num = 1 + 1;
}

Test #2

Title *

Async

Code *

var i = 0;
while (i < arr.length) {
  var num = 1 + 1;
  i++;
}

Test #3

Title *

Async

Code *

for (var i = 0, len = arr.length; i < len; i++) {
  var num = 1 + 1;
}

Test #4

Title *

Async

Code *

for (var i = arr.length; i > 0; i--) {
  var num = 1 + 1;
}

Test #5

Title *

Async

Code *

var i = arr.length - 1;
do {
  var num = 1 + 1;
}
while (i--);

Test #6

Title *

Async

Code *

var i = arr.length;
if (i > 0) {
  do {
    var num = 1 + 1;
  }
  while (--i);
}

Test #7

Title *

Async

Code *

for (var i in arr) {
  var num = 1 + 1;
}

Test #8

Title *

Async

Code *

while( i = arr.shift() ) {
  var num = 1 + 1;
}

Test #9

Title *

Async

Code *

arr.forEach(function (v){
  var num = 1 + 1;
});

Test #10

Title *

Async

Code *

while( (i = arr.shift()) !== undefined ) {
  var num = 1 + 1;
}

Test #11

Title *

Async

Code *

var a;
while((a = arr[i++]) !== undefined) {
  var num = 1 + 1;
}

Test #12

Title *

Async

Code *

while( i = arr.pop() ) {
  var num = 1 + 1;
}

Test #13

Title *

Async

Code *

var copy = arr.slice(0);
while( i = copy.shift() ) {
  var num = 1 + 1;
}

Test #14

Title *

Async

Code *

var l = arr.length;
while(l--) {
  var num = 1 + 1;
}

Test #15

Title *

Async

Code *

var len = arr.length;
for (var i = 0, x = arr[i]; i < len; ++i) {
  var num = 1 + 1;
}

Test #16

Title *

Async

Code *

// Source: http://stackoverflow.com/a/7252102/456584
for (var i = 0, len = arr.length; i < len; i++) {
  var num = 1 + 1;
}

Test #17

Title *

Async

Code *

var len = arr.length;
for (var i = 0; i < len; ++i) {
  var num = 1 + 1;
}

Test #18

Title *

Async

Code *

var len = arr.length;
for (var i = 0; i !== len; ++i) {
  var num = 1 + 1;
}

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