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Run results for:
Splice vs Spread vs Unshift to insert at beginning of array (fixed from slice)
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<iframe src="https://measurethat.net/Embed?id=556439" 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/129.0.0.0 Safari/537.36
Browser:
Chrome 129
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Unshift
31K/s
Splice
18K/s
Spread
361/s
View exact numbers
Test name
Executions per second
✓
Unshift
31,126 Ops/sec
Splice
17,633 Ops/sec
Spread
361 Ops/sec
Script Preparation code:
var array = Array.from({ length: 100 }).map((val, i) => i);
Tests:
Splice
var newArray = array.splice(0, 0, 99);
Spread
var newArray = [99, ...array];
Unshift
var newArray = array.unshift(99);