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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=492727" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:121.0) Gecko/20100101 Firefox/121.0
Browser:
Firefox 121
Operating system:
Ubuntu
Device Platform:
Desktop
Date tested:
2 years ago
Splice
21.4M/s
Spread
817K/s
Unshift
445K/s
View exact numbers
Test name
Executions per second
✓
Splice
21,436,024 Ops/sec
Spread
816,833 Ops/sec
Unshift
444,537 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);