Quiz for Custom Hooks

Q1: What is a custom hook in React?

A. A reusable function using hooks B. A React component C. A third-party library D. A type of CSS module

Q2: How do you name a custom hook?

A. Start with "use" B. Start with "hook" C. Start with "custom" D. Start with "react"

Q3: Can custom hooks call other hooks?

A. Yes B. No C. Only useState D. Only useEffect

Q4: What problem do custom hooks solve?

A. Code reuse and logic sharing B. Styling issues C. Routing D. State management only

Q5: Can custom hooks maintain internal state?

A. Yes B. No C. Only with useState D. Only with Redux

Q6: Are custom hooks components?

A. No B. Yes C. Sometimes D. Only functional components

Q7: What must a custom hook always return?

A. Any value or object B. A React element C. Only primitives D. Nothing

Q8: Can you use custom hooks inside class components?

A. No B. Yes C. Only with workarounds D. Yes, with HOCs

Q9: How do you use a custom hook in a component?

A. Call it like a regular function B. Import and use as component C. Use with JSX tags D. Use with lifecycle methods

Q10: Can custom hooks call asynchronous code?

A. Yes B. No C. Only inside useEffect D. Only with useState

Q11: What is the benefit of extracting logic into a custom hook?

A. Cleaner components and code reuse B. Faster rendering C. Better styling D. Improved routing

Q12: Is it possible to create a custom hook for data fetching?

A. Yes B. No C. Only with third-party libraries D. Only in class components

Q13: How do you test custom hooks?

A. Using React Testing Library’s renderHook B. Using Jest only C. Testing custom hooks is not possible D. Only with Enzyme

Q14: Can custom hooks access context?

A. Yes B. No C. Only with useState D. Only in class components

Q15: Do custom hooks have lifecycle methods?

A. No, but they can use hooks with lifecycle behavior B. Yes C. Only in class components D. Sometimes

Q16: Can a custom hook return multiple values?

A. Yes, via an object or array B. No, only one value C. Only primitives D. Only functions

Q17: What happens if you call a custom hook conditionally?

A. It breaks React hook rules B. It works fine C. Only on mount D. Only in class components

Q18: Can custom hooks modify component state?

A. Yes B. No C. Only props D. Only context

Q19: Which of these is an example of a custom hook name?

A. useFetchData B. fetchDataHook C. getData D. dataFetcher

Q20: Are custom hooks part of React’s official API?

A. Yes, they are user-defined but follow React rules B. No, they are third-party C. No, deprecated D. Yes, built-in