ReactJS Fundamentals Quiz

What does MERN stack stand for?

• MongoDB, Express.js, React.js, and Node.js

• MongoDB, Express.js, Angular.js, and Node.js

• MongoDB, Ember.js, React.js, and Node.js

• MySQL, Express.js, React.js, and Node.js

What are React components?

• Reusable, self-contained pieces of code that represent a part of the user interface.

• React components are JavaScript objects that store data and methods for manipulating that data.

• React components are HTML elements that are used to structure the layout of a web page.

• React components are functions that handle user input and update the state of the application.

How do you pass data from a parent component to a child component in React?

• Using state

• Using context

• Using props

• Using Redux

What is the purpose of state in React?

• The purpose of state in React is to handle user input and form submissions.

• The purpose of state in React is to control the styling and layout of components.

• The purpose of state in React is to store and manage the data that can change over time within a component.

• The purpose of state in React is to manage the routing and navigation between different pages.

What is JSX in React?

• JSX is a syntax extension for JavaScript that allows you to write HTML-like code in your JavaScript files.

• JSX is a framework used in React.

• JSX is a programming language used in React.

• JSX is a JavaScript library used in React.

What is the virtual DOM in React?

• The virtual DOM is a feature in React that allows developers to create dynamic web applications.

• The virtual DOM is a separate component in React that handles rendering and updating of the actual DOM.

• The virtual DOM is a concept in React that refers to the use of JavaScript objects to represent the structure of the web page.

• The virtual DOM is a lightweight copy of the actual DOM used in React to improve performance.

What is the difference between props and state in React?

• Props and state are the same thing in React.

• Props are used to pass data from a parent component to a child component, while state is used to manage data within a component.

• Props are used to manage data within a component, while state is used to pass data from a parent component to a child component.

• Props and state are both used to manage data within a component.

What is the significance of keys in React lists?

• Keys in React lists are used to sort the list items alphabetically.

• Keys in React lists are used to add styling to the list items.

• Keys in React lists are used to determine the position of the list items.

• Keys in React lists help identify and track changes in the list items.

What is the purpose of the setState() method in React?

• To update the state of a component and trigger a re-render

• To define the initial state of a component

• To handle user input in a form

• To fetch data from an API

What is the key benefit of using props in React components?

• To define CSS styles for components.

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  To manage internal component state.

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  To access the DOM directly.

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  To enable communication between parent and child components.