Run results for: NodeList vs Array iterator

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:136.0) Gecko/20100101 Firefox/136.0

Browser: Firefox 136

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

array

24K/s

nodeList

18K/s

View exact numbers

Test name	Executions per second
✓ array	23,834 Ops/sec
nodeList	18,026 Ops/sec

HTML Preparation code:

<ul>
</ul>

Script Preparation code:

var ul = document.querySelector('ul');
for(var i=0;i<100;i++) {
  ul.appendChild(document.createElement('li'));
}

var nodeList = document.querySelectorAll('li');
var array = Array.from(nodeList);

Tests:

nodeList
for (let i of nodeList) { i.classList.add("hi"); }
array
for (let i of array) { i.classList.add("hi"); }