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Run results for:
Concat vs push(...) vs spread for large 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=599248" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0
Browser:
Firefox 138
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Push (with spread)
453K/s
Control (for push)
115K/s
Concat
106K/s
Spread
24K/s
View exact numbers
Test name
Executions per second
✓
Push (with spread)
453,006 Ops/sec
Control (for push)
115,349 Ops/sec
Concat
105,986 Ops/sec
Spread
24,379 Ops/sec
Script Preparation code:
window.top.tests = {control:[], concat:[], pushSpread: [], spread:[]}; window.test = (new Array(10)).fill(null); window.cutoff = 5000;
Tests:
Control (for push)
for (let element of window.test) window.top.tests.control.push(element); if (window.top.tests.control.length > window.cutoff) { window.top.tests.control = []; console.log('reset control'); }
Concat
window.top.tests.concat = window.top.tests.concat.concat(window.test); if (window.top.tests.concat.length > window.cutoff) { window.top.tests.concat = []; console.log('reset concat'); }
Push (with spread)
window.top.tests.pushSpread.push(...window.test); if (window.top.tests.pushSpread.length > window.cutoff) { window.top.tests.pushSpread = []; console.log('reset push spread'); }
Spread
window.top.tests.spread = [...window.top.tests.spread, ...window.test]; if (window.top.tests.spread.length > window.cutoff) { window.top.tests.spread = []; console.log('reset spread'); }