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Run results for:
Array: [] vs at() last index
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<iframe src="https://measurethat.net/Embed?id=590810" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36 Edg/133.0.0.0
Browser:
Chrome 133
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Array[] array.length - 1
34375700.0 Ops/sec
Array.at() -1
35951580.0 Ops/sec
Array[] cached array.length - 1
33454528.0 Ops/sec
Script Preparation code:
var size = 0xffffff; var data = Array.from({length: size}, (_, index) => index);
Tests:
Array[] array.length - 1
let sum = 0; for (let i; i < size; i++) { sum += data[array.length - 1]; }
Array.at() -1
let sum = 0; for (let i; i < size; i++) { sum += data.at(-1); }
Array[] cached array.length - 1
let sum = 0; let length = data.length; for (let i; i < size; i++) { sum += data[length -1]; }