Run results for: Lodash Flatten v.s. concat

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.89 Safari/537.36

Browser: Chrome 84

Operating system: Mac OS X 10.15.4

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Lodash Flatten	5085422.5 Ops/sec
concate	1659690.5 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:

let ary = [1, [2, [3]]]

Tests:

Lodash Flatten
let ary = [1, [2, [3]]] return _.flatten(ary)
concate
let ary = [1, [2, [3]]] let res = [] ary.forEach(item => { if(!Array.isArray(item)) res.push(i) else res = res.concat(i) }); return res