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Run results for:
In loop, push(...) vs spread
Comparing the various ways to append to a large array during a loop
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<iframe src="https://measurethat.net/Embed?id=614858" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:141.0) Gecko/20100101 Firefox/141.0
Browser:
Firefox 141
Operating system:
Windows
Device Platform:
Desktop
Date tested:
9 months ago
Test name
Executions per second
Control (for push)
859731.6 Ops/sec
Spread
2183615.0 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'); }
Spread
window.top.tests.spread.push(...window.test); store = [] for (let element of window.test) [...store, element] if (window.top.tests.spread.length > window.cutoff) { window.top.tests.spread = []; console.log('reset spread'); }