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JavaScript JavaScript Loops, Arrays and Objects Tracking Multiple Items with Arrays Build a Quiz Challenge, Part 1 Solution

Ernie Smith
Ernie Smith
8,511 Points
Posted by Ernie Smith
Ernie Smith
8,511 Points

Getting "undefined" printed to page. Please help.

I can't figure out why my quiz doesn't work. This is my code:

var questions = [ ["What is after zero?" , 1], ["What is after 1?" , 2], ["What is after 3?" , 3] ]; var correctAnswers = 0; var question; var answer; var response; var html;

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

for (i = 0; i < questions.length; i+=1) { question = questions[i][0]; answer = questions[i][1]; response = parseInt(prompt(question)); if (response===answer) { correctAnswers += 1; } }

hmtl = "You got " + correctAnswers + " correct answers!"; print(html);

Zack Jackson
Zack Jackson
30,220 Points
Zack Jackson
Zack Jackson
30,220 Points

To post formatted code to the forum start it out with a line of three back ticks and close it with a line of three backticks.

your code here

var questions = [ ["What is after zero?" , 1], ["What is after 1?" , 2], ["What is after 3?" , 3] ]; 
var correctAnswers = 0; 
var question; 
var answer; 
var response; 
var html;

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

for (i = 0; i < questions.length; i+=1) { 
  question = questions[i][0]; 
  answer = questions[i][1]; 
  response = parseInt(prompt(question)); 
  if (response===answer) { 
    correctAnswers += 1; 
  }
}

hmtl = "You got " + correctAnswers + " correct answers!"; 
print(html);

2 Answers

Ali .
Ali .
15,521 Points
Ali .
Ali .
15,521 Points

Hi Ernie Smith,

You forgot to assign "i" for var. such as for (var i = 0; i < questions.length; i+=1).

Ernie Smith
Ernie Smith
8,511 Points
Ernie Smith
Ernie Smith
8,511 Points

Thanks Ali, I can't believe I missed that after going through the code of and over again.

However, even by adding var i = 0 I still get "undefined" printed to the page.

Any other help would be much appreciated. Thank you!

Ernie Smith
Ernie Smith
8,511 Points
Ernie Smith
Ernie Smith
8,511 Points

Doh! Nevermind, I just noticed I wrote "hmtl = " not html! Grrrrrr....