Benchmark: Object.groupBy vs Array.reduce 100k

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:

Object.groupBy
Object.groupBy(data, ({ id }) => id)
Array.reduce
data.reduce((acc, item) => { acc[item.id] = item; return acc; }, {})
Lodash groupBy
_.groupBy(data, ({id}) => id)
custom groupBy
// custom groupBy const groupBy = (data, property) => data.reduce((acc, item) => {acc[property] = item; return acc; }, {}) groupBy(data, 'id')

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Chrome 6 runs

Array.reduce

835/s

Lodash groupBy

268/s

Object.groupBy

65/s

Fastest: Array.reduce (12.9x faster)

View exact numbers

✓ Array.reduce: 835 ops/sec
• Lodash groupBy: 268 ops/sec
• Object.groupBy: 65 ops/sec

Results show median performance across all community submissions. Run this benchmark yourself to verify on your device.

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Object.groupBy
Array.reduce
Lodash groupBy
custom groupBy

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:134.0) Gecko/20100101 Firefox/134.0

Browser/OS: Firefox 134 on Mac OS X 10.15

View result in a separate tab

custom groupBy

2K/s

Array.reduce

2K/s

Object.groupBy

911/s

Lodash groupBy

600/s

View exact numbers

Test name	Executions per second
✓ custom groupBy	2,265 Ops/sec
Array.reduce	2,092 Ops/sec
Object.groupBy	911 Ops/sec
Lodash groupBy	600 Ops/sec

Object.groupBy vs Array.reduce 100k (version: 6)

Comparing performance of: `Object.groupBy vs Array.reduce vs Lodash groupBy vs custom groupBy`

Created: 2 years ago by: Registered User

Go to the latest result

Object.groupBy

Array.reduce

Lodash groupBy

custom groupBy

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Chrome 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Object.groupBy vs Array.reduce 100k (version: 6)

Comparing performance of: Object.groupBy vs Array.reduce vs Lodash groupBy vs custom groupBy

Created: 2 years ago by: Registered User

Go to the latest result

Object.groupBy

Array.reduce

Lodash groupBy

custom groupBy

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Chrome 6 runs

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Related benchmarks

Comparing performance of: `Object.groupBy vs Array.reduce vs Lodash groupBy vs custom groupBy`