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Run results for:
reduce concat vs flat vs concat spread vs reduce spread
Compare the new ES6 spread operator with the traditional concat() method
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=606918" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36
Browser:
Chrome 135
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
reduce + Array.prototype.concat
530730.6 Ops/sec
Array.prototype.flat
14431.3 Ops/sec
concat(...)
807354.9 Ops/sec
reduce spread
37289.8 Ops/sec
Script Preparation code:
var params = [ [1, 2], ["hello", true, 7], Array(10000).fill(4), ];
Tests:
reduce + Array.prototype.concat
const x = params.reduce((acc, val) => acc.concat(val), []);
Array.prototype.flat
const x = params.flat(1);
concat(...)
const x = [].concat(...params)
reduce spread
const x = params.reduce((acc, val) => [...acc, ...val], []);