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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 values = [],
        count = 10000;
    
    for (var i = 0; i < count; i++) {
      values[i] = i;
    }

Teardown JS

Test cases

Test #1

Title *

Async

Code *

var array = Array(count);
for (var i = 0; i < count; i++) {
  array[i] = values[i];
}

Test #2

Title *

Async

Code *

var array = [];
for (var i = 0; i < count; i++) {
  array.push(values[i]);
}

Test #3

Title *

Async

Code *

var array = [];
for (var i = 0; i < count; i++) {
  array[array.length] = values[i];
}

Test #4

Title *

Async

Code *

var arrayLength = 0;
var array = [];
for (var i = 0; i < count; i++) {
    array[arrayLength++] = values[i];
}

Test #5

Title *

Async

Code *

var array = [];
var i=count;
while(i--) {
  array[i]=values[i];
}

Test #6

Title *

Async

Code *

var array = Array(count);
var i=0;
while(i < count) {
  array[i]=values[i];
  i++;
}

Test #7

Title *

Async

Code *

var array = [];
var i=0;
while(i < count) {
  array.push(values[i]);
  i++;
}