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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 i, values = [],
      sum = 0;
  for (i = 0; i < 10000; i++) {
   values[i] = i;
  }
  
  function add(val) {
   sum += val;
  }
</script>

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *values.forEach(add);

Test #2

Title *

Async

Code *

Array.prototype.forEach = function forEach(fn, thisContext) {
  var iterator = thisContext !== undefined ? fn.bind(thisContext) : fn,
    length = iterator ? this.length : 0,
    i;
  for (i = 0; i < length; i++) {
    iterator(this[i], i, this);
  }
};