Run results for: Methods to remove duplicates from array

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.99 Safari/537.36 OPR/83.0.4254.27

Browser: Opera 83

Operating system: Windows

Device Platform: Desktop

Date tested: 3 years ago

Script Preparation code:

var array = [];
for (let i = 0; i < 100000; i++) {
   array.push(Math.floor((Math.random() * 10) + 1));
}

AخA
 
var array = [];for (let i = 0; i < 100000; i++) {   array.push(Math.floor((Math.random() * 10) + 1));}

Tests:

Using indexOf
array.filter((item, index) => array.indexOf(item) != index);
array.filter((item, index) => array.indexOf(item) != index);
Using lastIndexOf
array.filter((item, index) => array.lastIndexOf(item) != index);
array.filter((item, index) => array.lastIndexOf(item) != index);
Using a Set
[...new Set(array)]
[...new Set(array)]