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Run results for:
Array.Prototype.at vs index (negative)
Measures performance between using arr.at(-1) to access an element in an array and arr[arr.length - 1]
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<iframe src="https://measurethat.net/Embed?id=593531" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.3.1 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Array.at()
173.0M/s
Index
11.7M/s
View exact numbers
Test name
Executions per second
✓
Array.at()
172,978,448 Ops/sec
Index
11,657,858 Ops/sec
Tests:
Array.at()
const arr = ['a','b', 1, 2, true, false]; const val = arr.at(-1);
Index
const arr = ['a','b', 1, 2, true, false]; const val = arr[arr.lenght - 1];