JSFiddle - React, Tailwind, and code Playground

JavaScript

function arrayUnique(arr){
    return arr.filter((e,i,a)=>a.indexOf(e)==i)
}

// test
console.info(arrayUnique([1, 2, 1, 10, 5, 3, 4, 40, 50]))  // -> [1, 2, 10, 5, 3, 4, 40, 50]
console.info(arrayUnique([1, 2, 3, 1, 2, 33, 33, 55, 66])) // -> [1, 2, 3, 33, 55, 66]
console.info(arrayUnique(['privet', 'privet', 'kakdela'])) // -> ["privet", "kakdela"]