My unique code, feel free to give some feedback! ^^

console.log(Program starded...);

//array with questions and answers.
var questions = [
    ["Waar ligt manneke pis?", "brussel"],
    ["Hoe noemt men vervoer zoals: de bus, de trein, de tram?", "openbaar vervoer"],
    ["In welke sport gooit men een 'ijzeren bal' zo ver als hij kan?", "kogelstoten"]
];

//variabels for the math and output.
var answer = 0;
var correct_answer = 0;
var HTMLwrong = "<h1>Je hebt deze vragen helaas fout:</h1>";
var HTMLcorrect = "<h1>Je hebt deze vragen juist:</h1>";

//function to print any message i want to, to the screen.
function print(message) {
  document.write(message);
}

//function where the question gets asked and stored in'answer'.
function ask_question() {
answer = prompt(questions[i][0]);
}

/* questions get asked and answer is checked if right or wrong.
If it's right it gets added to 'HTMLcorrect'.
If it's wrong it gets added to 'HTMLwrong'.
*/
for (var i = 0; i < questions.length; i += 1 ) {
  ask_question();
    if (answer.toLowerCase() === questions[i][1]) {
      correct_answer += 1;
      HTMLcorrect += "<li>" + questions[i][0] + "</li>";
    } else {
      HTMLwrong += "<li>" + questions[i][0] + "</li>";
    }
}

//everything gets printed to the screen.
print("Je hebt maar liefst " + correct_answer + " juiste antwoorden!" + HTMLcorrect + HTMLwrong);


console.log(Program ended.);

´´´