Benchmark: lodash groupBy vs Array.reduce 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 }) => id)
Native
// Using reduce to mimic _.groupBy const grouped = data.reduce((acc, item) => { // Initialize an array for this id if it doesn't exist if (!acc[item.id]) acc[item.id] = []; // Push the item into the array for this id acc[item.id].push(item); return acc; }, {});

Rendered benchmark preparation results:

Previous results

Test case name	Result
Lodash
Native

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36 Edg/130.0.0.0

Browser/OS: Chrome 130 on Mac OS X 10.15.7

Lodash

68/s

Native

40/s

View exact numbers

Test name	Executions per second
✓ Lodash	68 Ops/sec
Native	40 Ops/sec

lodash groupBy vs Array.reduce 500k (version: 0)