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

Sahan Balasuriya
Sahan Balasuriya
10,115 Points
Posted by Sahan Balasuriya
Sahan Balasuriya
10,115 Points

It only asks one question

it only seems to ask the first question and nothing else happens 

var questions = [
  ['whats 1+1', 2],
  ['whats 2+2', 4],
  ['whats 1+2', 3]  
];

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

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

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

html = "you got" + correctAnswers + "questions right";
print(html);

2 Answers

malkio kusanagi
malkio kusanagi
12,336 Points
malkio kusanagi
malkio kusanagi
12,336 Points

You must separate the looping of user input prompt.

var questions = [
  ['whats 1+1', 2],
  ['whats 2+2', 4],
  ['whats 1+2', 3]  
];

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

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

function ask( response ){
for (var i = 0; i < questions.length; i += 1) {
  questions = questions[i][0];
  answer = questions[i][1];

  if (response === answer) {
    correctAnswers += 1;
return true;
  }
else return false;
}
}



do{
response = parseInt(prompt(questions));
if( ask(response) ){
html = "you got" + correctAnswers + "questions right";
print(html);
}

}while( true != false);

Mod Note - Changed from comment to answer so it may be voted on or marked as best answer.

Iain Simmons
MOD
Iain Simmons
Treehouse Moderator 32,305 Points
Iain Simmons
Iain Simmons
Treehouse Moderator 32,305 Points

Hi Sahan Balasuriya, you issue is that instead of using the singular question variable within the loop, you're actually changing the value of the questions (plural) array to equal the first question when you first loop, and then because the length becomes 1, it doesn't loop anymore.

Just change to the following and it should work (note the references to the array still need to be questions):

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