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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=520307" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:125.0) Gecko/20100101 Firefox/125.0
Browser:
Firefox 125
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
Benchmark engine:
Benchmark.js
splice
3.8M/s
shift
2.4M/s
slice
425/s
View exact numbers
Test name
Executions per second
✓
splice
3,755,074 Ops/sec
shift
2,354,095 Ops/sec
slice
425 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();