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Run results for:
slice VS splice VS shift: who is the fastest to keep constant size
100k list splice and shift win, they mutate list slice loose, it creates a copy of list 7.5x slower
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=586988" 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/18.1.1 Safari/605.1.15
Browser:
Safari 18
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Benchmark engine:
Benchmark.js
shift
33.8M/s
splice
32.5M/s
slice
474/s
View exact numbers
Test name
Executions per second
✓
shift
33,770,868 Ops/sec
splice
32,477,588 Ops/sec
slice
474 Ops/sec
Script Preparation code:
var list = []; for (var i = 0; i < 1000 * 1000; i++) { list.push(i); }
Tests:
slice
list.push('slice'); list = list.slice(1);
splice
list.push('splice'); list.splice(0, 1);
shift
list.push('splice'); list.shift();