React Routing and Performance

Question 1

What is React Router?

Accepted Answer

A library for handling navigation and URL routing in single-page React applications

Answer

A hardware component

Answer

A state manager

Answer

A build tool

Question 2

What is lazy loading in React?

Accepted Answer

Loading components or code only when they are needed rather than all upfront, improving initial load time

Answer

Slow rendering

Answer

A debugging mode

Answer

An error state

Question 3

What is React.memo?

Accepted Answer

A higher-order component that prevents re-rendering when props have not changed, optimizing performance

Answer

A note component

Answer

A memory hook

Answer

A documentation tool

Question 4

What is the useCallback hook?

Accepted Answer

A hook that memoizes callback functions, preventing their recreation on every render unless dependencies change

Answer

A phone call hook

Answer

An event handler

Answer

A promise handler

Question 5

What is code splitting?

Accepted Answer

Breaking the application bundle into smaller chunks that load on demand, reducing initial page load time

Answer

Dividing code among team members

Answer

Splitting CSS from JavaScript

Answer

A version control technique

Question 6

What is server-side rendering (SSR) in React?

Accepted Answer

Rendering React components on the server to HTML, sending pre-rendered content to the browser for faster initial load and SEO

Answer

Running React on a server

Answer

A caching technique

Answer

A deployment method