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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 SIZE = 2999;
  var sparseArray = [];
  var denseArray = [];
  for (var i = 0; i < SIZE; ++i) {
    var obj = {};
    sparseArray[i] = obj;
    denseArray.push(obj);
  }
</script>

Setup JS

Array.prototype.indexOfRef = function(ref) {
      for (var i = 0, _len = this.length; i < _len; ++i) {
        if (this[i] === ref) {
          return i;
        }
      }
      return -1;
    }

Teardown JS

Test cases

Test #1

Title *

Async

Code *sparseArray.indexOfRef(sparseArray[SIZE - 1]);

Test #2

Title *

Async

Code *sparseArray.indexOf(sparseArray[SIZE - 1]);

Test #3

Title *

Async

Code *denseArray.indexOfRef(denseArray[SIZE - 1]);

Test #4

Title *

Async

Code *denseArray.indexOf(denseArray[SIZE - 1]);