Filter -> Group

Filter

by Fulvio Cezar Canducci Dias

JavaScript

let array = [1, 2, 2, 2, 3, 3, 4, 4, 5, 6, 8, 8, 9, 9];

const arrayFilter = array.filter((item, index, array) => array.indexOf(item) !== index);
  
console.log([...new Set(arrayFilter)]);