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

Posted by Tristan Johnson
Tristan Johnson
Courses Plus Student 3,022 Points

Asking me the questions twice?

Why is it asking me each question twice?

var questions = [ ['Ten plus two?', 12], ['Seven plus nine?', 16], ['Four plus six?', 10], ]; 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) { question = questions[i][0]; answer = questions[i][1]; response = prompt(question); response = parseInt(prompt(question)); }

Mark Miller
Mark Miller
45,831 Points
Mark Miller
Mark Miller
45,831 Points

You 'for' loop looks messy. I don't see the parenthesis ending after incrementing 'i' nor do I see an opening curly brace anywhere. You should have three things inside the parenthesis, separated by two semicolons. Then open the curly brace to set the execution. The var I = 0; is correct, but next should be the condition being tested. 'i' should never become larger than the length of the array that holds the questions and answers. Test for that in the parenthesis. You should increment 'i' for the third part of the parenthesis.

1 Answer

David Abel
David Abel
5,199 Points
David Abel
David Abel
5,199 Points

Because you are prompting the user twice: response = prompt(question); response = parseInt(prompt(question));

These are both prompting the user for a response. You only need: response = parseInt(prompt(question));

I also had the clean up the code a bit for it to work for me. I think you're missing a curly brace on your for loop.