Technologies Coding Problems Bookmarks Learning Paths

Technologies Coding Problems Bookmarks Learning Paths

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Give some examples of Higher-order components | HOC | react Interview Questions | NextRound.in

Questions

5 of 9

1Can we use HOC inside the render method?

2Implement withAuthentication HOC

3Implement withLoading HOC

4How is HOC different from the wrapper component?

5Give some examples of Higher-order components

6List some use cases for higher-order components and implement them.

7Can we pass ref through higher order components?

8Can we mutate the inner function/ wrapped function?

9What are Higher-Order components?

react

State and Props

Class Components

Function Components

Lifecycle functions

Performance Optimisation

05 / 09

Give some examples of Higher-order components

Difficulty: 5/10

reusability, props injection, render props

HOCs are common in third-party React libraries,

1
Redux’s connect()
2
React.memo()
3
withRouter()
4
createFragmentContainer()
5
Error Boundary function
6
Relay’s createFragmentContainer.

Scenario Questions

0-2 years experience

1We have a Button component that needs to log clicks for analytics. How would you create a higher‑order component to add this logging without changing the Button code?
2If you wrap a component with a HOC that adds a new prop, what happens to the original component’s propTypes and defaultProps?

2-5 years experience

1Our team introduced a withTheme HOC, but after a recent refactor the UI stopped receiving the theme prop. Walk me through how you would debug the issue.

Follow-up Questions

What problems can arise if you stack many HOCs together?
How would you test a component that is wrapped by an HOC?
Can you achieve the same result with hooks, and what trade‑offs exist?

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2When deciding between using connect from Redux versus a custom withAuth HOC, what factors would influence your choice in a feature that requires both authentication state and UI theming?

5-8 years experience

1We have a page that composes three HOCs (withRouter, withPermissions, withFeatureToggle). Performance profiling shows extra renders. How would you redesign or optimize this composition?
2Explain how you would implement a generic HOC that forwards refs correctly while also injecting props, and why ref forwarding matters in a large component library.

8+ years experience

1Our legacy codebase uses many HOCs for cross‑cutting concerns, but the new team prefers hooks. How would you plan a migration strategy that minimizes risk and maintains backward compatibility?
2At a system‑level, what are the architectural trade‑offs of relying heavily on HOCs for concerns like logging, error handling, and theming across multiple product lines?