Technologies Coding Problems Bookmarks Learning Paths

Technologies Coding Problems Bookmarks Learning Paths

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What are the advantages of Custom Hooks? | Custom Hooks | react Interview Questions | NextRound.in

Questions

10 of 14

1Implement useMediaQuery hook.

3Implement useDebounce hook.

4Implement useLocalStorage hook.

5List potential pitfalls or risks of Custom Hooks.

6What should we do in cleanup functions?

7What are the advantages of cleaning up after an effect?

8What should be returned by custom hooks?

9What is the useEffect cleanup function?

10What are the advantages of Custom Hooks?

11What should not be put into custom hooks?

12What points to note and take care of while writing custom hooks?

13When should we use a custom hook?

14Why do we need custom hooks?

react

State and Props

Class Components

Function Components

Lifecycle functions

Performance Optimisation

10 / 14

What are the advantages of Custom Hooks?

Difficulty: 5/10

code reuse, state encapsulation, abstraction

Functions that don’t call Hooks don’t need to be Hooks.

Wrapping Effects in custom Hooks is often beneficial because:

1
Code sharing: It allows sharing effects between components.
2
More declarative: It lets our components focus on the intent rather than the exact implementation of our Effects.
3
Code Quality: It makes the data flow to and from your Effects very explicit.
4
When React adds new features, we can remove those Effects without changing any of our components.

Scenario Questions

0-2 years experience

1You need to fetch the current user's profile in two separate components. How would you use a custom hook to avoid duplicating the fetch logic?
2If you move form field handling into a custom hook, what happens to the component's state and its re‑render behavior?
3Suppose the custom hook you wrote should accept a URL parameter to fetch different resources. How would you design that API?

Follow-up Questions

Can you walk me through how you would test a custom hook?
What limitations have you run into when using custom hooks?
How do you decide between a custom hook and a higher‑order component?

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2-5 years experience

1We have a component that uses a custom hook for a debounced search, and after a recent refactor the search no longer triggers. How would you debug the problem?
2When choosing between a custom hook and a higher‑order component for sharing logic, what trade‑offs do you consider?
3Explain how you would structure a custom hook that manages a WebSocket connection used by multiple components, and why that design is beneficial.

5-8 years experience

1Our dashboard renders hundreds of widgets, each using a custom hook for data polling, and we’re seeing performance degradation. How would you evaluate and improve the hook’s design?
2Describe how you would enforce consistent error handling and loading states across the app using a shared custom hook, and what architectural implications that brings.
3If a custom hook’s useEffect depends on an object prop, what pitfalls could arise at scale and how would you mitigate them?

8+ years experience

1We plan to migrate a large legacy codebase to use custom hooks for all side‑effects. What rollout strategy would you propose to coordinate across multiple teams while minimizing risk?
2Discuss the long‑term maintenance considerations of exposing a library of custom hooks as a shared package across several products. How would you handle versioning and deprecation?
3How would you design a custom‑hook framework that lets teams plug in their own implementations (e.g., analytics) without breaking existing components?