Run results for: lodash groupBy vs map

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/143.0.0.0 Safari/537.36 Edg/143.0.0.0

Browser: Chrome 143

Operating system: Windows

Device Platform: Desktop

Date tested: 3 months ago

Test name	Executions per second
Lodash	314.0 Ops/sec
Native	107.5 Ops/sec

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var max2 = 100000;

var data = [];
for (var i = 0; i <= max2; i++) { data.push({ id: i, a: 2, b: "test" }); }

Tests:

Lodash
_.groupBy(data, "id")
Native
const mapN = new Map(); data.forEach((d) => { const id = d.id; if (!mapN.has(id)) { mapN.set(id, []); } mapN.get(id).push(d); });