Run results for: Array.reduce vs lodash groupBy 500k

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

Browser: Chrome 143

Operating system: Windows

Device Platform: Desktop

Date tested: 4 months ago

Test name	Executions per second
Lodash	37.2 Ops/sec
Native	74.0 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 = 500000;

var data = [];
for (var i = 0; i <= max2; i++) { data.push({ id: i }); }

Tests:

Lodash
_.groupBy(data, 'id')
Native
data.reduce((acc, item) => { const value = item['id']; if (!acc[value]) { acc[value] = [item]; } else { acc[value].push(item); } return acc; }, {})