Managing large applications in React - Cheat Sheet & Quick Revision

Recall & Review

beginner

Why is it important to split a large React app into smaller components?

Splitting a large app into smaller components makes the code easier to understand, test, and maintain. It also helps reuse parts of the UI and improves performance by updating only needed parts.

intermediate

What is code splitting in React and why use it?

Code splitting means breaking the app’s code into smaller chunks that load only when needed. This speeds up the initial load time and improves user experience by not loading everything at once.

intermediate

How does React Context help in managing state in large applications?

React Context allows sharing data like user info or theme across many components without passing props down manually at every level. This reduces 'prop drilling' and keeps state management cleaner.

intermediate

What role do custom hooks play in large React apps?

Custom hooks let you extract and reuse logic across components. This keeps code DRY (Don’t Repeat Yourself) and makes complex behaviors easier to manage and test.

beginner

Why is folder structure important in large React applications?

A clear folder structure helps developers find and organize files easily. It reduces confusion, speeds up development, and makes teamwork smoother.

What is the main benefit of using React.lazy and Suspense?

A To split code and load components only when needed

B To style components with CSS

C To manage global state

D To create class components

React.lazy and Suspense help load components lazily, improving app performance by loading code only when needed.

Which React feature helps avoid passing props through many layers?

A Context API

B useState

C useEffect

D React Router

Context API allows sharing data across components without passing props manually through every level.

What is a good reason to create custom hooks in a React app?

A To write CSS styles

B To create new HTML elements

C To manage routing

D To reuse logic across components

Custom hooks let you reuse logic, making code cleaner and easier to maintain.

How does a good folder structure help in large React apps?

A It makes the app run faster

B It helps organize files and find code easily

C It changes the app’s colors

D It automatically fixes bugs

A clear folder structure helps developers organize and locate files quickly, improving teamwork and maintenance.

What does 'prop drilling' mean in React?

A Deleting unused props

B Using props only once

C Passing props through many component layers unnecessarily

D Creating props dynamically

'Prop drilling' is when you pass props through many layers of components even if intermediate components don’t need them.

Explain how you would organize a large React application to keep it maintainable and efficient.

Think about how to keep code easy to understand, share data, and load fast.

Describe the benefits of using React Context and code splitting in large applications.

Focus on state sharing and performance improvements.