Quiz: Advanced JavaScript and Building Modern Applications

Question 1: Which JavaScript feature simplifies working with asynchronous code?

A. var B. async/await C. for loops D. XMLHttpRequest

Question 2: True or False: JSON is commonly used in APIs because it is both lightweight and easy to parse in JavaScript.

A. True B. False

Question 3: What is an API primarily used for?

A. Designing front-end layouts. B. Optimizing JavaScript code. C. Allowing applications to communicate and exchange data. D. Managing databases.

Question 4: What does useState do in React?

A. It defines routes in a React application. B. It initializes and manages component state. C. It applies styles to components. D. It renders components conditionally.

Question 5: True or False: A key feature of SPAs is that they reload the entire page for every user interaction.

A. True B. False

Question 6: Which HTTP method is commonly used to retrieve data from an API?

A. POST B. PUT C. DELETE D. GET

Question 7: True or False: JSON.stringify is used to convert a JSON string into a JavaScript object.

A. True B. False

Question 8: Which of the following frameworks uses a declarative approach to building UI components?

A. jQuery B. Vanilla JavaScript C. React D. PHP

Question 9: What does fetch().then() do in JavaScript?

A. Handles synchronous operations. B. Executes functions immediately. C. Parses JSON data directly. D. Chains Promises to handle asynchronous tasks.

Question 10: What is the primary use of props in React?

A. To manage state locally. B. To pass data from parent components to child components. C. To handle routing. D. To define event listeners.

Question 11: What is a key advantage of using SPAs (Single-Page Applications)?

A. They provide faster navigation by reducing server requests. B. They eliminate the need for JavaScript. C. They handle all logic on the server side. D. They automatically optimize all assets.