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286 lines (271 loc) · 7.55 KB
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const questions = [{
question: "How does JavaScript handle code with even a single tiny typo mistake?",
answers: [{
text: "It ignores the typo and continues execution",
correct: false
},
{
text: "It displays a warning but executes the code",
correct: false
},
{
text: "It prompts the user to fix the typo",
correct: false
},
{
text: "It rejects and does not work if there is even the most minuscule syntax error mistake",
correct: true
},
]
},
{
question: "How do you comment a single line of code in JavaScript?",
answers: [{
text: "/* comment */",
correct: false
},
{
text: "# comment",
correct: false
},
{
text: "// comment",
correct: true
},
{
text: "*** comment ***",
correct: false
},
]
},
{
question: "Which operator is used for strict equality in JavaScript?",
answers: [{
text: "==",
correct: false
},
{
text: "===",
correct: true
},
{
text: "=",
correct: false
},
{
text: "!==",
correct: false
},
]
},
{
question: "What does the acronym 'DOM'stand for in JavaScript?",
answers: [{
text: "Document Object Model",
correct: true
},
{
text: "Dynamic Object Manipulation",
correct: false
},
{
text: "Data Object Model",
correct: false
},
{
text: "Document Order Model",
correct: false
},
]
},
{
question: "What is the result of the expression 3 + '3' in JavaScript?",
answers: [{
text: "6",
correct: false
},
{
text: "'33'",
correct: true
},
{
text: "33",
correct: false
},
{
text: "Error",
correct: false
},
]
},
{
question: "What is the purpose of the ‘typeof’ operator in JavaScript?",
answers: [{
text: "To check if a variable is defined",
correct: false
},
{
text: "To determine the type of a value or variable",
correct: true
},
{
text: "To convert a string to uppercase",
correct: false
},
{
text: "To create a new variable",
correct: false
},
]
},
{
question: "What is the purpose of the `addEventListener` method in JavaScript?",
answers: [{
text: "To multiply two numbers",
correct: false
},
{
text: "To add event listeners to HTML elements ",
correct: true
},
{
text: "To create a loop",
correct: false
},
{
text: "To change the background color",
correct: false
},
]
}, {
question: "What does the term 'API' stand for in web development?",
answers: [{
text: "Application Programming Interface",
correct: true
},
{
text: "Advanced Programming Integration",
correct: false
},
{
text: "Automated Program Interaction",
correct: false
},
{
text: "Application Protocol Interface",
correct: false
},
]
}, {
question: "What is the purpose of the JSON.parse method in JavaScript?",
answers: [{
text: "To format text",
correct: false
},
{
text: "To parse JSON strings into JavaScript objects",
correct: true
},
{
text: "To create a new array",
correct: false
},
{
text: "To check if an element is a paragraph",
correct: false
},
]
}, {
question: "In JavaScript fetch, when using the HTTP method GET, where is the data typically included?",
answers: [{
text: "In the request body",
correct: false
},
{
text: "In the request headers",
correct: false
},
{
text: "In the URL parameters",
correct: true
},
{
text: "In the response body",
correct: false
},
]
}
];
const questionElement = document.getElementById("question");
const answerButtons = document.getElementById("answer-buttons");
const nextButton = document.getElementById("next-btn");
let currentQuestionIndex = 0;
let score = 0;
function startQuiz() {
currentQuestionIndex = 0;
score = 0;
nextButton.innerHTML = "Next";
showQuestion();
}
function showQuestion() {
resetState();
let currentQuestion = questions[currentQuestionIndex];
let questionNo = currentQuestionIndex + 1;
questionElement.innerHTML = questionNo + ". " + currentQuestion.
question;
currentQuestion.answers.forEach(answer => {
const button = document.createElement("button");
button.innerHTML = answer.text;
button.classList.add("btn");
answerButtons.appendChild(button);
if (answer.correct) {
button.dataset.correct = answer.correct;
}
button.addEventListener("click", selectAnswer);
});
}
function resetState() {
nextButton.style.display = "none";
while (answerButtons.firstChild) {
answerButtons.removeChild(answerButtons.firstChild);
}
}
function selectAnswer(e) {
const selectedBtn = e.target;
const isCorrect = selectedBtn.dataset.correct === "true";
if (isCorrect) {
selectedBtn.classList.add("correct");
score++;
} else {
selectedBtn.classList.add("incorrect");
}
Array.from(answerButtons.children).forEach(button => {
if (button.dataset.correct === "true") {
button.classList.add("correct");
}
button.disabled = true;
});
nextButton.style.display = "block";
}
function showScore() {
resetState();
questionElement.innerHTML = `You scored ${score} out of ${questions.length}!`;
nextButton.innerHTML = "Play Again!";
nextButton.style.display = "block";
}
function handleNextButton() {
currentQuestionIndex++;
if (currentQuestionIndex < questions.length) {
showQuestion();
} else {
showScore();
}
}
nextButton.addEventListener("click", () => {
if (currentQuestionIndex < questions.length) {
handleNextButton();
} else {
startQuiz();
}
});
startQuiz();