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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 = "g9p87ngyp876ncw65-8ut9-84ttttp1n[8xt[ntg[5nf87y42xn49p54545454mny0t968uy908u9ymi409yikj,obvmy985uv98n7y87fy5786fty6t687t71t76r276bt87y4npt9vhm98phvt9",
    arr = str.split("");
</script>script

Setup JS

Teardown JS

Test cases

Test #1

Title *

Async

Code *

for (
  var i = 0, j = arr.length, k; i < j; i++
)
  if (arr[i] === "1") k = i;

Test #2

Title *

Async

Code *

for (
  var i = 0, j = str.length, k; i < j; i++
)
  if (str.charAt(i) === "1") k = i;

Test #3

Title *

Async

Code *

for (
  var i = 0, j = str.length, k, split = str.split(""); i < j; i++
)
  if (split[i] === "1") k = i;