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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 str = '0, 1, 2, 3, 4, 5, 6, 7, 8, 9';
  var rgx2 = /5/g;
</script>

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

for (var i = 0; i < str.length; ++i) {
 if (str[i] === '5') {
  break;
 }
}

Test #2

Title *

Async

Code *

for (var i = 0, n = str.length; i < n; ++i) {
 if (str[i] === '5') {
  break;
 }
}

Test #3

Title *

Async

Code *var a = str.indexOf('5');

Test #4

Title *

Async

Code *var a = /5/g.exec(str).index;

Test #5

Title *

Async

Code *

var i = 0;
while(i !== str.length && str[i] !== '5') ++i;
var a = i;

Test #6

Title *

Async

Code *var a = str.split(',').indexOf('5');

Test #7

Title *

Async

Code *

rgx2.lastIndex = 0;
var a = rgx2.exec(str).index;

Test #8

Title *

Async

Code *

for (var i=0, j; j=ar[i]; ++i) {
  if (j === 5) {
    break;
  }
}