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Run results for:
Concat vs push(...) vs flat for large arrays of arrays
Comparing the various ways to append to a large array
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=569795" 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/130.0.0.0 Safari/537.36 Edg/130.0.0.0
Browser:
Chrome 130
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Control (for push)
326K/s
Spread
226K/s
Flat
197K/s
Concat
193K/s
View exact numbers
Test name
Executions per second
✓
Control (for push)
325,906 Ops/sec
Spread
225,689 Ops/sec
Flat
197,115 Ops/sec
Concat
192,538 Ops/sec
Script Preparation code:
window.top.tests = {control:[], concat:[], spread:[], flat: []}; window.test = (new Array(10)).fill(null); window.arrays = (new Array(10)).fill(window.test); window.cutoff = 5000;
Tests:
Control (for push)
window.top.tests.control = window.arrays.reduce((acc, arr) => { acc.push(...arr); return acc; }, []); if (window.top.tests.control.length > window.cutoff) { window.top.tests.control = []; console.log('reset control'); }
Concat
window.top.tests.concat = window.arrays.reduce((acc, arr) => acc.concat(arr), []); if (window.top.tests.concat.length > window.cutoff) { window.top.tests.concat = []; console.log('reset concat'); }
Spread
window.top.tests.spread = window.arrays.reduce((acc, arr) => [...acc, ...arr], []); if (window.top.tests.spread.length > window.cutoff) { window.top.tests.spread = []; console.log('reset spread'); }
Flat
window.top.tests.flat = window.arrays.flat(); if (window.top.tests.flat.length > window.cutoff) { window.top.tests.flat = []; console.log('reset flat'); }