Benchmark: lodash uniqby - MeasureThat.net

HTML Preparation code:

<script src="lodash.js"></script>

Script Preparation code:

const array1 = [...Array(10000).keys()].map(key => ({
    id: key,
    value: 'array1'
}));

const array2 = [...Array(10000).keys()].map(key => ({
    id: key,
    value: 'array2'
}));

const combineArray = [...array1, ...array2]

Tests:

Lodash
_.uniqBy(combineArray,'id')
JS using filter
const uniqBy = (array, key) => { const seen = new Set() return array.filter(item => { const keyValue = item[key] if (seen.has(keyValue)) { return false } else { seen.add(keyValue) return true } }) } uniqBy(combineArray,'id')
JS using reduce
const uniqBy = (array,key) => { const _key = key ?? 'id' return Object.values( array.reduce((acc, doc) => { if (!(doc[_key] in acc)) { acc[doc[_key]] = doc } return acc }, Object.create(null)), ) } uniqBy(combineArray,'id')

Historical Performance Data aggregated from 6 community runs

Desktop Results:

Chrome 6 runs

JS using filter

2K/s

Lodash

1K/s

JS using reduce

1K/s

Fastest: JS using filter (2.1x faster)

View exact numbers

✓ JS using filter: 2,300 ops/sec
• Lodash: 1,477 ops/sec
• JS using reduce: 1,096 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
Lodash
JS using filter
JS using reduce

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_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Mac OS X 10.15.7

View result in a separate tab

Lodash

4K/s

JS using filter

3K/s

JS using reduce

2K/s

View exact numbers

Test name	Executions per second
✓ Lodash	3,887 Ops/sec
JS using filter	3,491 Ops/sec
JS using reduce	1,985 Ops/sec

lodash uniqby (version: 4)

Comparing performance of: `Lodash vs JS using filter vs JS using reduce`

Created: one year ago by: Registered User

Go to the latest result

Lodash

JS using filter

JS using reduce

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

lodash uniqby (version: 4)

Comparing performance of: Lodash vs JS using filter vs JS using reduce

Created: one year ago by: Registered User

Go to the latest result

Lodash

JS using filter

JS using reduce

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: `Lodash vs JS using filter vs JS using reduce`