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Run results for:
at method versus array index
How does Array.prototype.at() performance compare to traditional indexing (arr[i]).
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<iframe src="https://measurethat.net/Embed?id=535379" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36
Browser:
Chrome 126
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Initial value indexing
228K/s
Initial value at()
212K/s
Last value at()
209K/s
Last value indexing
206K/s
Random value indexing
195K/s
Random value at()
178K/s
View exact numbers
Test name
Executions per second
✓
Initial value indexing
228,311 Ops/sec
Initial value at()
212,103 Ops/sec
Last value at()
209,302 Ops/sec
Last value indexing
206,010 Ops/sec
Random value indexing
194,717 Ops/sec
Random value at()
178,107 Ops/sec
Script Preparation code:
arr = Array.from({length: 1000}, (_, i) => i);
Tests:
Initial value indexing
const index_zero = arr[0]; console.log(index_zero);
Random value indexing
const index_random = arr[Math.floor(Math.random() * arr.length)]; console.log(index_random);
Last value indexing
const index_last = arr[arr.length - 1]; console.log(index_last);
Initial value at()
const at_zero = arr.at(0); console.log(at_zero);
Random value at()
const at_random = arr.at(Math.floor(Math.random() * arr.length)); console.log(at_random);
Last value at()
const at_last = arr.at(-1); console.log(at_last);