Run results for: lodash uniqby

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

JS using filter

3K/s

JS using reduce

1K/s

Lodash

879/s

View exact numbers

Test name	Executions per second
✓ JS using filter	3,266 Ops/sec
JS using reduce	1,074 Ops/sec
Lodash	879 Ops/sec

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')