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Start your free trialMicah Angelica Baguio
3,409 PointsImprove the quiz - one solution
It keeps saying this: uncaught TypeError: incorrect.push is not a function at quiz.js:34:18 But that's exactly what the teacher did. I just don't understand why his works and mine doesn't?
const questions = [
['What is the nearest planet towards the Sun?', 'Mercury'],
['What is the second nearest planet towards the sun?', 'Venus'],
['What is the third nearest planet towards the sun?', 'Earth'],
['Name of the planet next to planet Earth', 'Mars']
];
// 1. Create a multidimensional array to hold quiz questions and answers
// 2. Store the number of questions answered correctly
const correct = 0;
const incorrect = 0;
let correctAnswers = 0;
/*
3. Use a loop to cycle through each question
- Present each question to the user
- Compare the user's response to answer in the array
- If the response matches the answer, the number of correctly
answered questions increments by 1
*/
for ( let i = 0; i < questions.length; i++ ) {
let question = questions[i] [0];
let answer = questions[i] [1];
let response = prompt(question);
if ( response === answer ) {
correctAnswers++;
correct.push(questions);
} else {
incorrect.push(questions);
}
}
function createListItems( arr ) {
let items = '';
for ( let i = 0; i < arr.length; i++ ) {
items += `<li>${ arr[i] [0] }, by ${ arr[i][1] } - ${ arr[i][2] }</li>`;
}
return items;
}
// 4. Display the number of correct answers to the user
let html = `
<h1>You got ${correctAnswers} question(s) correct</h1>
<h2>You got these questions right:</h2>
<ol>${ createListItems(correct) }</ol>
<h2>You got these questions wrong:</h2>
<ol>${ createListItems(incorrect) }</ol>
`;
document.querySelector('main').innerHTML = html;
1 Answer
Steven Parker
231,269 PointsThe push method only exists on arrays, and in the video the variable incorrect
is created as an array:
const incorrect = [];
But in this code, it is created as number:
const incorrect = 0;