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Run results for:
Array 2000 spread vs concat
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=509601" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36
Browser:
Chrome 122
Operating system:
Windows
Device Platform:
Desktop
Date tested:
2 years ago
Concat
300K/s
Concat from empty
225K/s
Spread
52K/s
View exact numbers
Test name
Executions per second
✓
Concat
300,219 Ops/sec
Concat from empty
225,176 Ops/sec
Spread
51,576 Ops/sec
Script Preparation code:
var a = Array.from({ length: 2000 }, (_, index) => index); var b = Array.from({ length: 2000 }, (_, index) => 2000 - index);
Tests:
Spread
const spread = [...a, ...b];
Concat
const concat = a.concat(b);
Concat from empty
const concatEmpty = [].concat(a).concat(b);