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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;
  }

  function someFn(ix) {
    return ix * 5 + 1 / 3 * 8;
  }
</script>

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

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

Test #2

Title *

Async

Code *

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

Test #3

Title *

Async

Code *

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

Test #4

Title *

Async

Code *

var i = 0, item;
while((item = arr[i++]) !== undefined) {
  someFn(item);
}

Test #5

Title *

Async

Code *

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