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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>
  var arr = new Array(100);
</script>

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

var i = 0;
while (i < arr.length) {
 arr[i];
 i++;
};

Test #2

Title *

Async

Code *

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

Test #3

Title *

Async

Code *

var i = arr.length;
while (i--) {
 arr[i];
};

Test #4

Title *

Async

Code *

var i = arr.length;
while (i-- > 0) {
 arr[i];
};

Test #5

Title *

Async

Code *

var i = arr.length;
do {
 arr[i];
} while (i--);

Test #6

Title *

Async

Code *

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

Test #7

Title *

Async

Code *

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

Test #8

Title *

Async

Code *

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

Test #9

Title *

Async

Code *

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

Test #10

Title *

Async

Code *

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

Test #11

Title *

Async

Code *

arr.forEach(function(x) {
 x;
});

Test #12

Title *

Async

Code *

function foo(x) {
 x;
};
arr.forEach(foo);

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