JavaScript JavaScript Arrays Multidimensional Arrays Improve the Quiz – One Solution

terry okey
terry okey
3,187 Points

function junction?

This is correct code and it works fine. But I just can't understand how the "createListItems" function is working. I understand how it loops through the array, but I just can't understand what the fourth line in the function is doing? Is the 'i' in the for loop and the 'i' in the function referencing each other, or are the separated because of their scope? Is the first line of the function creating a variable named "arr"?

// 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 correctAnswers = 0;


  1. 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(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 = <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;

terry okey
terry okey
3,187 Points

So when I posted the code it took all the line breaks out. When I say the fourth line of the function, I mean the part that says: for (let i = 0; i < arr.length; i++) and the line: items += <li>${arr[i]}</li>;