10 interview questions regarding ReactJS useRef() Hook
Here are 10 interview questions regarding the useRef()
Hook in React:
What is the purpose of the
useRef()
Hook in React?- Explain when and why you might use it.
How does
useRef()
differ fromuseState()
in React?- Highlight the key distinctions between these two hooks.
Can you provide an example of using
useRef()
to access and manipulate a DOM element in a functional component?- Demonstrate a simple use case of
useRef()
.
- Demonstrate a simple use case of
What is the role of
useRef()
in handling mutable values across renders?- Discuss scenarios where mutable values are relevant and how
useRef()
facilitates this.
- Discuss scenarios where mutable values are relevant and how
How do you use
useRef()
to persist values across renders without triggering re-renders?- Explain the mechanism behind the preservation of values with
useRef()
.
- Explain the mechanism behind the preservation of values with
Can
useRef()
be used to create instance variables in functional components?- Discuss how
useRef()
allows for the creation of instance variables.
- Discuss how
How does
useRef()
contribute to handling focus in React applications?- Provide an example where
useRef()
is used for managing focus.
- Provide an example where
Explain the use of
useRef()
in conjunction withuseEffect()
to perform actions after rendering.- Discuss scenarios where combining these hooks is beneficial.
Can you use
useRef()
for storing and accessing previous state values in a functional component?- Discuss the limitations and alternatives for managing previous states.
How does
useRef()
contribute to improving performance in certain scenarios?- Discuss specific use cases where
useRef()
can lead to performance optimizations.
- Discuss specific use cases where
Conclusion
These questions cover various aspects of the useRef()
Hook in React, including its purpose, use cases, differences from other hooks, and its role in managing mutable values and improving performance.