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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)

Setup JS

var arr = [];
    
    for (var i=0; i<1000; i++) {
      arr.push('arr-value-' + i);
    }
    
    function worker() {
      return(1+1);
    }

Teardown JS

Test cases

Test #1

Title *

Async

Code *

for (var i=0; i < arr.length; i++) {
  worker();
}

Test #2

Title *

Async

Code *

for (var i=0; i < arr.length; ++i) {
  worker();
}

Test #3

Title *

Async

Code *

for (var i=0, len=arr.length; i<len; i++) {
  worker();
}

Test #4

Title *

Async

Code *

var len=arr.length;

for (var i=0; i<len; i++) {
  worker();
}

Test #5

Title *

Async

Code *

var len=arr.length;

for (var i=0, ilen=len; i<ilen; i++) {
  worker();
}

Test #6

Title *

Async

Code *

var i = arr.length;
while (i--) {
  worker();
};

Test #7

Title *

Async

Code *

var i = arr.length;
while (--i) {
  worker();
};