Run results for: Lodash difference vs Set & Filter

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:88.0) Gecko/20100101 Firefox/88.0

Browser: Firefox 88

Operating system: Mac OS X 10.13

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
Lodash	19326.7 Ops/sec
Set & Filter	16985.8 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:

var arr1 = [];
for(let i = 0; i < 100; i++) {
  arr1.push('' + i);
}

var arr2 = [];
for(let i = 49; i >= 0; i--) {
  arr2.push('' + i);
}

Tests:

Lodash
const notInArr1 = _.difference(arr2, arr1) const notInArr2 = _.difference(arr1, arr2)
Set & Filter
const arr1Set = new Set(); const arr2Set = new Set(); arr1.forEach(value => arr1Set.add(value)); arr2.forEach(value => arr2Set.add(value)); const notInArr1 = arr2.filter(value => !arr1Set.has(value)); const notInArr2 = arr1.filter(value => !arr2Set.has(value));