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Run results for:
Array 2000 spread vs concat
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<iframe src="https://measurethat.net/Embed?id=509478" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64; rv:123.0) Gecko/20100101 Firefox/123.0
Browser:
Firefox 123
Operating system:
Linux
Device Platform:
Desktop
Date tested:
2 years ago
Test name
Executions per second
Spread
49366.6 Ops/sec
Concat
141040.5 Ops/sec
Concat from empty
83081.5 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);