Run results for: lodash groupBy vs Array.reduce 100k - test

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.36

Browser: Chrome 99

Operating system: Mac OS X 10.13.6

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
Lodash	117.0 Ops/sec
Native	297.6 Ops/sec
Prebuilt keys	1954.5 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 = [];
var keys = new Array(max2).map((item, index) => index);
for (var i = 0; i <= max2; i++) { data.push({ id: i }); }

Tests:

Lodash
_.groupBy(data, ({ id }) => id)
Native
data.reduce((acc, item) => { acc[item.id] = item; return acc; }, {})
Prebuilt keys
keys.map((key) => { return data.filter((item) => item.id); });

Run results for: lodash groupBy vs Array.reduce 100k - test

Lodash

Native

Prebuilt keys