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JavaScript

SeHyun Choi
SeHyun Choi
3,441 Points
Posted by SeHyun Choi
SeHyun Choi
3,441 Points

Uncaught TypeError: Cannot read property '1' of undefined?

I am keep getting error message saying [1] is undefined. But in my 'questions array' I have 2, 4, 6.

CODE

var questions = [

    ["What is 1 + 1 = ?", 2],

    ["What is 2 + 2 = ?", 4],

    ["What is 3 + 3 = ?", 6],

];


var correctAnswers = 0;
var questions;
var answers;
var response;
var html;


function print(message) {
    var printIt = document.write(message);
    return printIt;
}



for ( var i = 0; i < questions.length; i += 1 ) {

    questions = questions[i][0];

    answers = questions[i][1];

    response = parseInt(prompt(questions));

        if( response === answers ) {
            correctAnswer += 1;

        }
}

html = "You got" + correctAnswers + " question(s) right.";
print(html);

1 Answer

KRIS NIKOLAISEN
KRIS NIKOLAISEN
54,967 Points

You have declared var questions twice and reassigned the variable here

questions = questions[i][0];

It would be better to use:

var question;
var answer;

and

question = questions[i][0];

You are also missing an s in correctAnswers here

correctAnswer += 1;