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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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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
Test name
Executions per second
Array.from(NodeList).map
2200473.0 Ops/sec
[...NodeList].map
2392016.5 Ops/sec
map.call(NodeList)
2494776.0 Ops/sec
NodeList#map
2530441.5 Ops/sec
for loop
2593332.5 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));