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Run results for:
Concat vs push(...) 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=582703" 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/132.0.0.0 Safari/537.36
Browser:
Chrome 132
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
one year ago
Spread
3.1M/s
Concat
962K/s
Control (for push)
659K/s
View exact numbers
Test name
Executions per second
✓
Spread
3,061,966 Ops/sec
Concat
961,681 Ops/sec
Control (for push)
659,372 Ops/sec
Script Preparation code:
window.top.tests = {control:[], concat:[], 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'); }
Spread
window.top.tests.spread.push(...window.test); if (window.top.tests.spread.length > window.cutoff) { window.top.tests.spread = []; console.log('reset spread'); }