generateQuestionQuiz.js

// Related to François' question on this video: https://www.youtube.com/watch?v=ThcV5bW62nc

const generateQuestion = (countries) => {
  const randomIndex = Math.floor(Math.random() * countries.length);

  const country = countries[randomIndex];

  const possibilities = [];
  const selectedIndexes = []; // set of indexes of countries that are selected
  while (possibilities.length < 3) {
    const randomIndex = Math.floor(Math.random() * countries.length);
    // if the random index is not in the selected indexes, add it to the possibilities
    if (selectedIndexes.indexOf(randomIndex) === -1) {
      const country = countries[randomIndex];
      possibilities.push(country.name);
      selectedIndexes.push(randomIndex);
    }
  }

  possibilities.push(country.name);

  possibilities.sort((a, b) => {
    return a.charCodeAt(0) - b.charCodeAt(0);
  });

  const question = {
    flag: country.flag,
    answer: country.name,
    possibilities,
  };

  return question;
};

// END

// only for testing and see that it actuall works
const getCountries = () => {
  console.log("Loading countries...");
  console.log("This may take some time");
  return fetch("https://restcountries.com/v2/all")
    .then((response) => response.json())
    .then((data) => data)
    .catch((error) => console.log(error));
};

getCountries()
  .then((countries) => {
    const question = generateQuestion(countries);
    console.log(question);
  })
  .catch((error) => console.log(error));