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Run results for:
Array.from(NodeList).map vs [...NodeList].map vs map.call(NodeList) vs. NodeList#map copied from Array vs for loop
Different methods of mapping a node list.
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Embed
Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=489177" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/119.0
Browser:
Firefox 119
Operating system:
Ubuntu
Device Platform:
Desktop
Date tested:
2 years ago
Benchmark engine:
Benchmark.js
for loop
2.6M/s
NodeList#map
2.5M/s
map.call(NodeList)
2.5M/s
[...NodeList].map
2.4M/s
Array.from(NodeList).map
2.2M/s
View exact numbers
Test name
Executions per second
✓
for loop
2,593,332 Ops/sec
NodeList#map
2,530,442 Ops/sec
map.call(NodeList)
2,494,776 Ops/sec
[...NodeList].map
2,392,016 Ops/sec
Array.from(NodeList).map
2,200,473 Ops/sec
Script Preparation code:
NodeList.prototype.map = Array.prototype.map; window.list = document.querySelectorAll('div'); window.mapper = node => node.outerHTML;
Tests:
Array.from(NodeList).map
Array.from(list).map(mapper);
[...NodeList].map
[...list].map(mapper);
map.call(NodeList)
Array.prototype.map.call(list, mapper);
NodeList#map
list.map(mapper);
for loop
const result = []; for (let i = 0; i < list.length; i++) result.push(mapper(list[i], i, list));