Example 11-7. A Multiple-Choice Quiz, Version 3

stop( );
//  *** Init main timeline variables
var displayTotal;               // Text field for displaying user's final score
var numQuestions = 2;           // Number of questions in the quiz
var totalCorrect = 0;           // Number of correct answers
var userAnswers = new Array( );  // Array containing user's guesses
var correctAnswers = [3, 2];    // Array containing each question's correct answer
// Notice that we no longer need to maintain two long lists of variables 
// named q1answer, q2answer, etc., and correctAnswer1, correctAnswer2, etc.
// We now store that information conveniently in an array.

// *** Function to register the user's answers
function answer (choice) {
  // Since we can now check how many answers have been given via the
  // length property of userAnswers, we no longer need to manually track
  // that information with the answer.currentAnswer property. Note also 
  // that we have done away with the unwieldy set statement that previously
  // assigned the user's answer to a dynamically named variable.

  // Tack the user's answer onto our array
  userAnswers.push(choice);
  // Do a little navigation, baby
  if ((userAnswers.length) == numQuestions) {
    gotoAndStop ("quizEnd");
  } else {
    gotoAndStop ("q"+ (userAnswers.length + 1));
  }
}

// *** Function to tally the user's score
function gradeUser( ) {
  // Count how many questions were answered correctly. Our
  // userAnswer/correctAnswer element comparison is much cleaner than the
  // snake pit of eval( ) functions we used to do the same job in the previous version.
  for (var i = 0; i < userAnswers.length; i++) {
    if (userAnswers[i] == correctAnswers[i]) {
      totalCorrect++;
    }
  }
  // Show the user's score in a dynamic text field
  displayTotal = totalCorrect;
}