18. Reverse Without String Methods - Ask the user for a number and reverse it without using .split(), .reverse(), or join().

ReverseWithoutStringMethods.js

// First run: npm i prompt-sync (in the terminal).
const prompt = require('prompt-sync')();

const num = Number(prompt("Enter a number: "));
strNum = num.toString();
let result = "";
for (let i = strNum.length - 1; i >= 0; i--) {
    result += strNum[i];
}
console.log(result);