Run results for: Lodash difference vs filtering via set membership

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Lodash	243.8 Ops/sec
Set & Filter	280.0 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 < 100000; i++) {
  arr1.push(i.toString());
}

var arr2 = [];
for(let i = 9999; i >= 0; i--) {
  arr2.push(i.toString());
}

Tests:

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

Run results for: Lodash difference vs filtering via set membership

Lodash

Set & Filter