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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 JSconst length = 1000;

Teardown JS

Test cases

Test #1

Title *

Async

Code *

let arr = new Array(length);
for(let i = 0;i < length;i++) {
	arr[i] = 1;
}

Test #2

Title *

Async

Code *

let arr = [];
arr.length = length;
for(let i = 0;i < length;i++) {
	arr[i] = 1;
}

Test #3

Title *

Async

Code *

let arr = [];
for(let i = 0;i < length;i++) {
	arr[i] = 1;
}

Test #4

Title *

Async

Code *

let arr = [];
for(let i = 0;i < length;i++) {
	arr.push(1);
}