Run results for: DOM get attributes of children vs JS Array READ performance v3

Results: Reading the DOM with nextElementSibling + getAttribute is less than 5% slower than an JS array list. textContent is slightly faster than a JS array list, and nodeValue is 3X faster. Listing a JS array in a for i-- loop backwards yield ~2X performance

Go to the benchmark

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.54 Safari/537.36

Browser: Chrome 95

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
fastest iter childelements	1316210.6 Ops/sec
tag name	828149.6 Ops/sec
class name	858032.3 Ops/sec
id	616016.1 Ops/sec
array of node	836004.6 Ops/sec
array item	2206713.0 Ops/sec
fastest iter childelements + getAttribute	2159394.0 Ops/sec
fastest iter childelements + nodeValue	7058151.5 Ops/sec
fastest iter childelements + textContent	2399057.2 Ops/sec
fastest iter childelements + getAttributeNode	1684552.4 Ops/sec
tag name--	915715.4 Ops/sec
class name--	900000.0 Ops/sec
queryselectorall class--	658490.4 Ops/sec
queryselectorall tag--	639069.8 Ops/sec
array item--	3912033.0 Ops/sec

HTML Preparation code:

<html>

<body>
    <div id='test'>
        <div class='item' id='a' name='a'>a</div>
        <div class='item' id='b' name='b'>b</div>
        <div class='item' id='c' name='c'>c</div>
    </div>
</body>

</html>

Script Preparation code:

var parent = document.getElementById('test');

var store1 = [];
var store2 = [];
parent.childNodes.forEach(function (node) {
  if ( node.nodeName !== '#text') {
  store1.push( node );
  store2.push( { name: node.attributes.name.value } );
  }
});

for (let i = store2.length-1; i >= 0; i--) {
  let n = store2[i].name;
  console.log("R",n)
}

Tests:

fastest iter childelements
let elem = parent.firstElementChild; do { let n = elem.attributes.name.value; } while (elem = elem.nextElementSibling)
tag name
let children = parent.getElementsByTagName('div'); for (let i = 0; i < children.length; i++) { let n = children[i].attributes.name.value; }
class name
let children = parent.getElementsByClassName('item') for (let i = 0; i < children.length; i++) { let n = children[i].attributes.name.value; }
id
let n1 = document.getElementById('a').attributes.name.value; let n2 = document.getElementById('b').attributes.name.value; let n3 = document.getElementById('c').attributes.name.value;
array of node
for (let i = 0; i < store1.length; i++) { let n = store1[i].attributes.name.value; }
array item
for (let i = 0; i < store2.length; i++) { let n = store2[i].name; }
fastest iter childelements + getAttribute
let elem = parent.firstElementChild; do { let n = elem.getAttribute('name'); } while (elem = elem.nextElementSibling)
fastest iter childelements + nodeValue
let elem = parent.firstElementChild; do { let n = elem.nodeValue; } while (elem = elem.nextElementSibling)
fastest iter childelements + textContent
let elem = parent.firstElementChild; do { let n = elem.textContent; } while (elem = elem.nextElementSibling)
fastest iter childelements + getAttributeNode
let elem = parent.firstElementChild; do { let n = elem.getAttributeNode('name').value; } while (elem = elem.nextElementSibling)
tag name--
let children = parent.getElementsByTagName('div'); for (let i = children.length-1; i >= 0; i--) { let n = children[i].attributes.name.value; }
class name--
let children = parent.getElementsByClassName('item') for (let i = children.length-1; i >= 0; i--) { let n = children[i].attributes.name.value; }
queryselectorall class--
let children = parent.querySelectorAll('.item') for (let i = children.length-1; i >= 0; i--) { let n = children[i].attributes.name.value; }
queryselectorall tag--
let children = parent.querySelectorAll('div') for (let i = children.length-1; i >= 0; i--) { let n = children[i].attributes.name.value; }
array item--
for (let i = store2.length-1; i >= 0; i--) { let n = store2[i].name; }

Run results for: DOM get attributes of children vs JS Array READ performance v3

Results: Reading the DOM with nextElementSibling + getAttribute is less than 5% slower than an JS array list. textContent is slightly faster than a JS array list, and nodeValue is 3X faster. Listing a JS array in a for i-- loop backwards yield ~2X performance

fastest iter childelements

tag name

class name

id

array of node

array item

fastest iter childelements + getAttribute

fastest iter childelements + nodeValue

fastest iter childelements + textContent

fastest iter childelements + getAttributeNode

tag name--

class name--

queryselectorall class--

queryselectorall tag--

array item--