Run results for: ym0AIT7Il6askdakjdkakjsdkjb

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/89.0.4389.114 Safari/537.36

Browser: Chrome 89

Operating system: Linux

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Add passing	1804992.0 Ops/sec
Add all	1542695.4 Ops/sec
Add all without anonymous arrow function	3287649.2 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/lodash/4.17.21/lodash.min.js"></script>

Script Preparation code:

var arrFull = ['1','2','3','4','5','6','7','8','9','0']
var arrOne = ['2','4','5','7','8','9','0']

var set = new Set(['2','3','4','5','6','7']);

Tests:

Add passing
const passing = _.difference(arrOne, arrFull); passing.forEach(item => set.add(item))
Add all
arrOne.forEach(item => set.add(item))
Add all without anonymous arrow function
arrOne.forEach(set.add, set)