Benchmark: Array.reduce vs lodash groupBy 500k

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; }, {})

Rendered benchmark preparation results:

Previous results

Test case name	Result
Lodash
Native

Latest run results:

Run details: (Test run date: 7 months ago)

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/OS: Chrome 143 on Windows

Native

74/s

Lodash

37/s

View exact numbers

Test name	Executions per second
✓ Native	74 Ops/sec
Lodash	37 Ops/sec

Array.reduce vs lodash groupBy 500k (version: 1)