IT13 (Quiz 2)

What is JSX?

• A type of JavaScript library.

• A database query language.

• A syntax extension for JavaScript that looks like HTML.

• A tool for debugging.

What is the primary advantage of the Virtual DOM in React?

• It allows for direct manipulation of the real DOM.

• It efficiently calculates and applies the minimum number of changes to the real DOM.

• It makes all components reusable.

• It automatically handles all server-side logic.

The fundamental building blocks of a React application are called:

• Variables

• Functions

• Components

• Classes

Which command is used to start a new React project with a pre-configured build environment?

• npx create-react-app my-app

• npm install react

• npm start

• npm build

In React, what does npm start do?

• Installs new dependencies.

• Creates a new React project.

• Starts the local development server.

• Compiles the code for production.

What is the main difference between functional and class components in modern React?

• Functional components cannot handle props.

• Class components are simpler and more concise.

• Functional components are defined as functions and use hooks, while class components use ES6 classes.

• Class components are not supported anymore.

What is the purpose of the render() method in a class component?

• To manage component state.

• To fetch data from an API.

• To return the JSX for the component.

• To define the component's styling.

The core principle of building applications by combining self-contained, reusable pieces of code is known as:

• Module-based development.

• Asynchronous programming.

• Component-based development.

• State management.

When writing JSX, what must you do if you want to use a JavaScript expression within the HTML-like syntax?

• Enclose it in parentheses ().

• Enclose it in single quotes ''.

• Enclose it in curly braces {}.

• Enclose it in square brackets [].

What is a key advantage of using a tool like Create React App?

• It allows you to build mobile apps.

• It handles the complex setup of a development environment so you can focus on code.

• It automatically writes your components for you.

• It deploys your app to the web.