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Run results for:
reduce concat vs reduce spread performance
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=613895" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (iPhone; CPU iPhone OS 18_5 like Mac OS X) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Mobile/15E148 Safari/604.1
Browser:
Mobile Safari 18
Operating system:
iOS 18.5
Device Platform:
Mobile
Date tested:
9 months ago
Test name
Executions per second
reduce with spread
2.4 Ops/sec
reduce with concat
10.5 Ops/sec
Script Preparation code:
var arr = Array.from({length:10000}, (v, i) => i);
Tests:
reduce with spread
arr.reduce((a, o) => [...a, ...[o*2, o*4]], []);
reduce with concat
arr.reduce((a, o) => a.concat([o*2, o*4]), []);