Run results for: filter vs reduce vs difference

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_14_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/78.0.3904.108 Safari/537.36

Browser: Chrome 78

Operating system: Mac OS X 10.14.6

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
filter()	4779.4 Ops/sec
reduce()	4828.0 Ops/sec
difference()	28299.9 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 arrOne = new Array(Math.round(Math.random() * 999) + 1).fill(null).map(elem => Math.round(Math.random() * 998) + 1);
var arrTwo = new Array(Math.round(Math.random() * 999) + 1).fill(null).map(elem => Math.round(Math.random() * 998) + 1);

Tests:

filter() A
var resultA = arrOne.filter(elem => !arrTwo.includes(elem));
filter() B
var resultB = arrOne.filter(elem => !(arrTwo.indexOf(elem) >= 0));
_.filter()
var resultC = _.filter(arrOne, elem => !arrTwo.includes(elem));
_.difference()
var resultD = _.difference(arrOne, arrTwo);

Run results for: filter vs reduce vs difference

filter() A

filter() B

_.filter()

_.difference()