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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>

</script>

Setup JS

// Populate the base array
    var arr = [];
    for (var i = 0; i < 1000; i++) {
      arr[i] = 'value' + i;
    }
  
    function someFn(ix) {
      acc += ix * 5 + 1 / 3 * 8;
    }
  
  var len = arr.length
    , i = 0
    , acc = 0;

Teardown JS



            console.log(acc);

Test cases

Test #1

Title *

Async

Code *

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

Test #2

Title *

Async

Code *

var i = 0;
while (i < arr.length) {
  someFn(i);
  i++;
}

Test #3

Title *

Async

Code *

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

Test #4

Title *

Async

Code *

for (var i = arr.length; i > 0; i--) {
  someFn(i);
}

Test #5

Title *

Async

Code *

var i = arr.length - 1;
do {
  someFn(i);
}
while (i--);

Test #6

Title *

Async

Code *

var i = arr.length;
if (i > 0) {
  do {
    someFn(i);
  }
  while (--i);
}

Test #7

Title *

Async

Code *

for (var i in arr) {
  someFn(i);
}

Test #8

Title *

Async

Code *

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

Test #9

Title *

Async

Code *

for (var i = arr.length; i > 0; i -= 1) {
  someFn(i);
}

Test #10

Title *

Async

Code *

var i;
for (i = arr.length; i > 0; i -= 1) {
  someFn(i);
}

Test #11

Title *

Async

Code *

var i;
for (i = arr.length; i > 0; i--) {
  someFn(i);
}

Test #12

Title *

Async

Code *

for (; i < len; ++i) {
  someFn(i);
}

Test #13

Title *

Async

Code *

console.log(i);
for (; i < len; ++i) {
  someFn(i);
}

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