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Run results for:
Unshift vs concat
We can add elements to the beginning of array using both, let's find out which is faster. Unshift also mutates the array. Concat does not, so that would be preferable.
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=487951" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:120.0) Gecko/20100101 Firefox/120.0
Browser:
Firefox 120
Operating system:
Linux
Device Platform:
Desktop
Date tested:
2 years ago
Test name
Executions per second
Unshift
184052.4 Ops/sec
Concat
35.0 Ops/sec
Script Preparation code:
var arr = [1, 3, 5, 11, 13];
Tests:
Unshift
arr.unshift(4,5)
Concat
[4,5].concat(arr);