Boolean Tracker or New Array?

In the task, I started considering using a Boolean Array to track which questions had been answered correctly (True for correct answers and False for incorrect ones seemed a very intuitive way to track it, and the array would just correspond to the index position of the Questions/Answers array, so the referencing between them was easy enough).

  if (answer.toLowerCase() === response.toLowerCase()) {
    rightAnswers++;
    answerTracker[i] = true;
  } else {
    answerTracker[i] = false;
  }

I would then later, as necessary, simply pull the corresponding questions and answers from the original Q&A array, when building the List items for the HTML - arrTracker being the answerTracker array, arrData being the Q&A array, and the bool value being whether or not we are writing the list for the correct answers or incorrect answers with the current function call.

function createListItems(arrTracker, arrData, bool) {
  let items = '';
  for (let i = 0; i < arrTracker.length; i++) {
    if (arrTracker[i] == bool) {
      items += `<li>${arrData[i][0]} - ${arrData[i][1]}</li>`;
    }
  }
  return items;
}

All in all, I saved having to make 2 arrays (Right Answers and Wrong Answers) to track data already in the Q&A Array, and I now store less complex variables in the array, while still being able to perform a later lookup for both the Answers or Questions, by cross-referencing the two arrays.

• Are there any reasons that I haven't spotted yet, that Guil is using two separate arrays to track the correct or wrong answers?