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JavaScript JavaScript Arrays Multidimensional Arrays Improve the Quiz – One Solution

Uncaught Syntax Error: Invalid Destructuring assignment target?? Can anyone point me to my mistake pls?

Can anyone tell me where I went wrong?I am getting Uncaught SyntaxError: Invalid destructuring assignment target on the console and nothing runs. Appreciate help!

// 1. Create a multidimensional array to hold quiz questions and answers

const questions = [ 
  ['How many planets are in the Solar System?', '8'],
  ['How many continents are there?', '7'],
  ['How many legs does an insect have?', '6'],
  ['What year was JavaScript created?', '1995']  
];
// 2. Store the number of questions answered correctly

const correct= [];
const incorrect =[];
let answerCorrect= 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){
  answerCorrect ++;
  correct.push(question);

  }else {
    incorrect.push(question);
    }
}

function createListItems(arr) {
  let items = '';
  for (let i = 0; i < arr.length; i++) {
    items += `<li>${arr[i]}</li>`;
  }
  return items;
}

// 4. Display the number of correct answers to the user
let html= `You have correctly answered  ${answerCorrect} questions
<h1> Correct Answers</h1>
<ol> ${createListItems(correct)}</ol>

<h1>You got these questions wrong</h1>
<ol>${createListItems(incorrect)} </ol>
`;


  document.querySelector('main').innerHTML = html;

1 Answer

Gergely Bocz
Gergely Bocz
14,244 Points

Hi Christian Dianne Oro !

You are referring to the elements of the multidimensional array 'questions' incorrectly.

In your for loop:

for (let i=0; i<questions.length; i++){
  let question = questions[i],[0];
  let answer = questions[i],[1];
let response = prompt(question);

You should write:

  let question = questions[i][0];
  let answer = questions[i][1];

Instead of

  let question = questions[i],[0];
  let answer = questions[i],[1];

So there is no comma between the brackets. If there was a comma between the brackets, then your code would be interpreted like a destructuring assignment, like so:

Make the element at index 0 of the question variable equal to the element at index i of the questions variable and the element at index 1 of the question variable equal to the element at index 0 of the questions variable.

This fails, because question is not an array, so the target of the destructuring assignment is invalid. If it were an array, then question[0] would be equal to questions[i] and question[1] would be equal to questions[0].

If you are interested in destructuring, I suggest the MDN Page