JSFiddle - React, Tailwind, and code Playground

by A A

HTML

<div id="root">

</div>

JavaScript

//уникальне значение отсортированнного массива
//получить данные
let n = prompt("first line", 0);
let arr = []

const elem = document.getElementById("root");

for (let i = 0; i < n; i++) {
	arr[i] = prompt(`${i} line`, 0);
}

//работа с данными

let longest = 0;
let newArr = [];

for (let i = 0; i < arr.length; i++) {
  if (arr[i+1] !== arr[i]) {
    console.log(arr[i], arr[i+1], newArr)
  	newArr.push(arr[i])
  } 
}

console.log("newArr = ", newArr);
elem.innerHTML = newArr;