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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 = [];
  for (var i = 0; i < 50000; i++) {
    arr.push(i);
  };
  var half = Math.floor(arr.length / 2);

  function getArr() {
    return arr.slice(0);
  };

  function randomInt(max) {
    return Math.floor(Math.random() * (max + 1));
  };
</script>

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

var arr = getArr();
for (var i = 0; i < 1000; i++) {
  arr.splice(half, 0, -1 - i);
}

Test #2

Title *

Async

Code *

var arr = getArr();
for (var i = 0; i < 1000; i++) {
  arr.push(-1 - i);
}

Test #3

Title *

Async

Code *

var arr = getArr();
for (var i = 0; i < 1000; i++) {
  arr.unshift(-1 - i);
}