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

Posted by Stanley Wilkins
Stanley Wilkins
685 Points

No prompt for questions

Here is the code from the video, but no questions show up when I run it:

var questions = [
  ['how?',15],
  ['why?',9],
  ['see?',7],
]

var correctAnswers = 0;
var question;
var answer;
var response;
var html;

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

for (m = 0; m *less than* questions.length; m += 1) {
  question = question[m][0];  
  answer = question[m][1];
  response = parseInt(prompt(question));

  }

but prompting works when I write something simple like this:

  var pass = prompt("What is the password")
  if (pass == "hack") {
    confirm("welcome");
  } else {
    window.close();
  }

p.s: For loop doesn't show up correctly when I paste code here, I set m less than the length of questions and incremented it by 1. ... m < questions.length; m += 1) {

Ashish Mehra
Ashish Mehra
Courses Plus Student 31 Points 
var questions = [
  ['how?',15],
  ['why?',9],
  ['see?',7]  //remove comma from here
]
for (m = 0; m                              //what is this i think loop is not declared properly
  question = question[m][0];  
  answer = question[m][1];
  response = parseInt(prompt(question));

  }
Stanley Wilkins
Stanley Wilkins
685 Points

Check my note : For loop doesn't show up correctly when I paste code here, I set m less than the length of questions and incremented it by 1. ... m < questions.length; m += 1) { Removed the comma but still doesn't work.

Steve Hunter
Steve Hunter
57,712 Points

As soon as you use a less than or greater than symbol, the formatting goes to pot! I can see when I edit your post that the loop is set up correctly, i'll edit it to be a little clearer.

Stanley Wilkins
Stanley Wilkins
685 Points

A weird bug, huh? Thanks for the correction.

Steve Hunter
Steve Hunter
57,712 Points

Yeah - I think it stems from the HTML origins of the formatter. It drives me nuts at times!! You might be able to escape the character out; I'll give it a try now.

[EDIT: Nope; I can't get it to work]

1 Answer

Lindsay Sauer
Lindsay Sauer
12,029 Points

You had it, it was just a little typo: within the for loop, you are trying to assign question to itself (an undefined value) rather than the questions array. The correct code would be:

question = question*s[m][0];
answer = questions*[m][1];

Stanley Wilkins
Stanley Wilkins
685 Points

Oh, really! I have been blind all along.