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JavaScript JavaScript Loops, Arrays and Objects Tracking Multiple Items with Arrays Build a Quiz Challenge, Part 2 Solution

The questions gotten right or wrong isn't displaying

Is there a problem with my code?

var numb; var question; var response; var gotAnswers; var answer; var answeredCorrectly = 0; var correct = []; var wrong = [];

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

function info(arra){ var numb = '<ol>'; for(var i; i < arra.length; i ++){ numb += '<li>' + arra[i] + '</li>'; } numb += '</ol>'; return numb; }

var test = [ ['What is force per unit area?', 'pressure'], ['How many states are in Nigeria?', '36'], ['What is the universal solvent?', 'water'], ['How many abs does a human being have?', '6'], ['What is the most expensive apple smartphone?', 'iphone x'] ];

for(var c = 0; c < test.length; c ++){ question = test[c][0]; answer = test[c][1]; response = prompt(test[c][0]); if(response === answer){ answeredCorrectly ++; correct.push(question); }else{ wrong.push(question); } }

gotAnswers = 'You answered ' + answeredCorrectly + ' question(s) correctly'; gotAnswers += '<h2>' + 'You got these questions right:' + '</h2>'; gotAnswers += info(correct); gotAnswers += '<h2>' + 'You got these questions worong:' + '</h2>'; gotAnswers += info(wrong); print(gotAnswers);

2 Answers

Steven Parker
Steven Parker
229,788 Points

The loop in the info function doesn't initialize the index variable:

  for (var i; i < arra.length; i++) {      // <-- current code
  for (var i = 0; i < arra.length; i++) {  // <-- with fix added

In future questions, use the instructions for code formatting in the Markdown Cheatsheet pop-up below the "Add an Answer" area. :arrow_heading_down:   Or watch this video on code formatting.

Thank you very much Steven, my program is up and running now.