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Run results for:
Splice vs Spread vs Unshift to insert at beginning of array
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<iframe src="https://measurethat.net/Embed?id=610498" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Mobile Safari/537.36
Browser:
Chrome Mobile 136
Operating system:
Android
Device Platform:
Mobile
Date tested:
one year ago
Splice
52.8M/s
Spread
3.6M/s
Unshift
31K/s
View exact numbers
Test name
Executions per second
✓
Splice
52,836,836 Ops/sec
Spread
3,554,794 Ops/sec
Unshift
31,253 Ops/sec
Script Preparation code:
var array = Array.from({ length: 100 }).map((val, i) => i);
Tests:
Splice
var newArray = array.slice(0, 0, 99);
Spread
var newArray = [99, ...array];
Unshift
var newArray = array.unshift(99);