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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

Teardown JS

Test cases

Test #1

Title *

Async

Code *

const myList = [];
const entries = [];
function addToMyList(element) {
  myList.push(element);
  if(myList.length > 20) {
    myList.shift();
  }
}
for(let i = 0; i < 100; i++) {
	addToMyList(entries[i] = {
		id: i
	});
}

Test #2

Title *

Async

Code *

const myList = [];
const entries = [];
function addToMyList(element) {
  myList.unshift(element);
  if(myList.length > 20) {
    myList.pop();
  }
}
for(let i = 0; i < 100; i++) {
	addToMyList(entries[i] = {
		id: i
	});
}

Test #3

Title *

Async

Code *

const myList = [];
const entries = [];
let index = 0;
function addToMyList(element) {
  if(myList.length == 20) {
  	myList[index++] = element;
  	index %= 20;
  } else {
  	myList.push(element);
  }
}
for(let i = 0; i < 100; i++) {
	addToMyList(entries[i] = {
		id: i
	});
}

Test #4

Title *

Async

Code *

const mySet = new WeakSet();
const entries = [];
function addToMyList(element) {
	mySet.add(element);
}
for(let i = 0; i < 100; i++) {
	addToMyList(entries[i] = {
		id: i
	});
}