Run results for: lodash groupBy vs Array.reduce 100k (actual groupping, not keyBy!)

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: 7 months ago

Native

409/s

Lodash

200/s

View exact numbers

Test name	Executions per second
✓ Native	409 Ops/sec
Lodash	200 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 }); }

Tests:

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