Benchmark: Fastest way to list children: childNodes vs children vs firstChild/nextSibling vs firstElementChild/nextElementSibling v2 fixed

Fastest way to list children: childNodes vs children vs firstChild/nextSibling vs firstElementChild/nextElementSibling v2 fixed (version: 0)

Result: firstElementChild is the fastest yielding 3-4X performance. With lastElementChild close (margin of error) 2nd. Other observations: doing for loop i-- with children shows ~150% higher performance vs i++. And unloading it into a variable prior yields another ~200% boost

Comparing performance of: childNodes foreach vs children (direct) vs children (into variable) vs children-- (direct) vs children-- (into variable) vs ChildNodes for (direct) vs ChildNodes for (into variable) vs ChildNodes for-- (direct) vs ChildNodes for-- (into variable) vs firstElementChild nextElementChild vs lastElementChild previousElementChild vs firstChild nextSibling vs lastChild previousSibling

Created: 4 years ago by: Guest

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HTML Preparation code:

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

Script Preparation code:

var parent = document.getElementById('test');

Tests:

childNodes foreach
parent.childNodes.forEach(function (node) { let n = node; });
children (direct)
for (let i = 0; i < parent.children.length; i++) { let n = parent.children[i]; }
children (into variable)
let children = parent.children; for (let i = 0; i < children.length; i++) { let n = children[i]; }
children-- (direct)
for (let i = parent.children.length-1; i >= 0; i--) { let n = parent.children[i]; }
children-- (into variable)
let children = parent.children; for (let i = children.length-1; i >= 0; i--) { let n = children[i]; }
ChildNodes for (direct)
for (let i = 0; i < parent.childNodes.length; i++) { let n = parent.childNodes[i]; }
ChildNodes for (into variable)
let children = parent.childNodes; for (let i = 0; i < children.length; i++) { let n = children[i]; }
ChildNodes for-- (direct)
for (let i = parent.childNodes.length-1; i >= 0; i--) { let n = parent.childNodes[i]; }
ChildNodes for-- (into variable)
let children = parent.childNodes; for (let i = children.length-1; i >= 0; i--) { let n = children[i]; }
firstElementChild nextElementChild
let elem = parent.firstElementChild; do { let n = elem; } while (elem = elem.nextElementSibling)
lastElementChild previousElementChild
let elem = parent.lastElementChild; do { let n = elem; } while (elem = elem.previousElementSibling)
firstChild nextSibling
let elem = parent.firstChild; do { let n = elem; } while (elem = elem.nextSibling)
lastChild previousSibling
let elem = parent.lastChild; do { let n = elem; } while (elem = elem.previousSibling)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
childNodes foreach
children (direct)
children (into variable)
children-- (direct)
children-- (into variable)
ChildNodes for (direct)
ChildNodes for (into variable)
ChildNodes for-- (direct)
ChildNodes for-- (into variable)
firstElementChild nextElementChild
lastElementChild previousElementChild
firstChild nextSibling
lastChild previousSibling

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

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