Run results for: _.flatten vs .flatMap

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

_.flatten

8.9M/s

.flat

5.1M/s

View exact numbers

Test name	Executions per second
✓ _.flatten	8,869,182 Ops/sec
.flat	5,077,209 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Tests:

_.flatten
const arr = [['1', '2', '3'], ['1', '2', '3'], ['1', '2', '3']] _.flatten(arr)
.flat
const arr = [['1', '2', '3'], ['1', '2', '3'], ['1', '2', '3']] arr.flatMap((item) => item)