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

Why isnt my code showing me how many i got right?

this is my code:

var questions = [ ['How many fingers are in your hand?', 5], ['How many states in the US?', 50], ['5 + 5 equals what?', 10], ]; var question; var answer; var response; var html; var correctAnswers;

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

for (var i =0; i < questions.length; i ++) { question = questions[i][0]; answer = questions[i][1]; response = parseInt( prompt(question) ); if (response === answer) { correctAnswers ++; } } html = You got ${correctAnswers} question(s) right!; print(html);

1 Answer

You should initialize correctAnswers with zero.

var correctAnswers = 0;

Otherwise you are adding a number to undefined which results in NaN