Quiz 7

In React, what is the main purpose of "props"?

• a) To manage state within components

• b) To define class components

• c) To handle asynchronous actions

• d) To pass data between components

What does the "useEffect" hook in React allow you to do?

• a) Declare state variables

• b) Modify the DOM directly

• c) Perform side effects in functional components

• d) Define component constructors

In Express.js, which middleware is commonly used to parse JSON data from incoming requests?

• a) express.static

• b) express.json

• c) express.urlencoded

• d) express.cookieParser

What is JSX in the context of React?

• a) JavaScript XML

• b) Java Syntax Extension

• c) JSON XML Schema

• d) JavaScript XSLT

Which of the following React lifecycle methods is called after a component is rendered on the screen?

• a) componentDidMount

• b) componentWillUnmount

• c) componentDidUpdate

• d) componentWillMount

In Express.js, what does the "app.use" function do?

• a) Sets up a route for GET requests

• b) Defines a middleware function

• c) Creates a new instance of Express

• d) Specifies a static file directory

What is the purpose of "useState" in React Hooks?

• a) To perform asynchronous operations

• b) To manage state in functional components

• c) To fetch data from an API

• d) To define class components

In Express.js, how can you access the request parameters sent in the URL?

• a) req.query

• b) req.params

• c) req.body

• d) req.headers

Which React component lifecycle method is called when a component is about to update?

• a) componentWillUpdate

• b) componentDidUpdate

• c) componentWillUnmount

• d) componentWillMount

What is the purpose of "express.static" in Express.js?

• a) To define middleware for handling static files

• b) To manage application routing

• c) To create an instance of the Express framework

• d) To define routes for dynamic content