Experimenting with Loops, Arrays and Conditions...

var answers = ['bashful', 'doc', 'dopey', 'happy', 'sleepy', 'sneezy', 'grumpy'];
var right = [];
var wrong = [];

var correctGuesses = 0;
var incorrectGuesses = 0;
var response = [];
var html

function print(message) {
  var outputDiv = document.getElementById ('output')
  outputDiv.innerHTML = message;
}

function getAnswer () {
  response = prompt('What are the names of the Seven Dwarves?');
  response = response.toLowerCase ();
  if ((answers.indexOf (response) > -1) && (right.indexOf (response) === -1)) {
    correctGuesses += 1;
   right.push (response);
  } else {
   wrong.push (response);
    incorrectGuesses += 1;
  }} 

function printList (arr) {
  var listHTML = '<ol>';
   for ( var i = 0; i < arr.length; i += 1) {
    listHTML += '<li>' + arr[i] + '</li>';
  }
  listHTML += '</ol>';
  return listHTML;}

for (var i = 0; i < answers.length; i += 1) {
  getAnswer ()
}

html = 'You got ' + correctGuesses + ' correct! Well Done!'
html += '<h2>These are the guesses you got right:-</h2>';
html += printList (right);
html += '<h2>The ' + incorrectGuesses + ' you got wrong was/were:-</h2>';
html += printList (wrong);
html += '<h2>Did you guess the same one twice??</h2>';
print (html);