Run results for: Methods to remove duplicates from array

Run details:

User agent: Mozilla/5.0 (Android 14; Mobile; rv:135.0) Gecko/135.0 Firefox/135.0

Browser: Firefox Mobile 135

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Using a Set

380/s

Using indexOf

114/s

Using lastIndexOf

114/s

View exact numbers

Script Preparation code:

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