Feedback on solution

var quiz = [
  ["What are non-wizarding folk called?", "muggles"],
  ["What are the soul sucking, despair inducing creatures called that can be vanquished with a Patronus charm?", "dementors"],
  ["What are the objects into which you can split your soul?", "horcruxes"],
  ["What is Ron Weasley's only sister's name?", "ginny"],
  ["What is Alastor Moody commonly known as? ", "mad eye"],
];

var yourScore = " ";

function print(message) {
  document.write(message);
}

function printCorrectAns(answer){

  var correctMsg = "<h2>You got these questions right: </h2> <ol>";
  correctMsg += answer;
  correctMsg += "</ol>";
  print(correctMsg);
  }

function printIncorrectAns(answer) {
  var incorrectMsg = "<h2>You got these questions wrong: </h2> <ol>";
  incorrectMsg += answer;
  incorrectMsg += "</ol>";
  print(incorrectMsg);
  }


  //check score and post appropriate response

  function checkScore(score, correctMsg, incorrectMsg) {
     if ( score === 0 ) {
       printIncorrectAns(incorrectMsg);
    } else if (score < quiz.length - 1) { 
      printCorrectAns(correctMsg);
     printIncorrectAns(incorrectMsg);
    } else {
      printCorrectAns(correctMsg);
    }
  }


/* function to start quiz - ask a question and add it into a loop
    compare the answer and see if answer was correct.  
 */
function runQuiz() {
  var score = 0;
  var correctMsg = " ";
  var incorrectMsg = " ";
  for (i = 0; i < quiz.length; i++){
    var answer = prompt(quiz[i][0]);
    if (answer === quiz[i][1]){
      correctMsg += "<li>" + quiz[i][0] + "</li>";
      score += 1; 
    } else {
      incorrectMsg += "<li>" + quiz[i][0] + "</li>";
    }
}  

  yourScore += "<b>Your Score is : </b>" + score; 
  print (yourScore);

  /* check if user answered all questions wrong 
     if so don't show the message for correct answers 
     also check whether all answers were correct and 
     finally handle the case when you have mix of correct/incorrect answers
  */

   checkScore(score, correctMsg, incorrectMsg); 

}

runQuiz();