JSFiddle - React, Tailwind, and code Playground

JavaScript

const myObj = {
  questions: []
}

const words = prompt('введите числа от одного до трёх', 'один, два, три');

myObj.questions = words
  .split(', ')
  .map(word => `${word.charAt(0).toUpperCase()}${word.slice(1)}`);

myObj.questions.forEach(word => {
  console.log(word)
})