Run results for: Perf _.groupBy vs native Array.reduce

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/144.0.0.0 Safari/537.36 Edg/144.0.0.0

Browser: Chrome 144

Operating system: Windows

Device Platform: Desktop

Date tested: 2 months ago

Test name	Executions per second
_.groupBy	5274654.0 Ops/sec
Native Array reduce	9064613.0 Ops/sec

HTML Preparation code:

<script type="text/javascript" src="https://cdn.jsdelivr.net/npm/underscore@1.13.1/underscore-umd-min.js"></script>

Tests:

_.groupBy
const a = ["one", "two", "three"]; _.groupBy(a, "length");
Native Array reduce
const a = ["one", "two", "three"]; a.reduce((acc, curr) => { acc[curr.length] = (acc[curr.length] || []); acc[curr.length].push(curr); return acc; }, {});