Renting the right talent is very important to build web applications that can be discredited and highly performing. For Companies, startups, and businesses funded by seeds Invest Software development servicesReacting is often the heart of the development of modern front-end.

Are you a recruitment manager preparing A Technical interviews react Or the developer is preparing for your next great opportunity, this 25 react coding interview questions with solutions will help you evaluate your skills or prepare effectively.

This guide includes Reacts questions and answers to interviews Starting from the basic concepts to advanced features – ideal for interviewers and candidates.

1. Does that react?

React is a javascript library developed by Facebook to build a dynamic user interface, especially the one -page application. It uses a Component -based architecture and a Dom virtual For efficient updates.

2. What components react?

Components are UI building blocks that can be reused.

• Function component – Preferably in developing modern reactions.

• Class components – an older approach, still supported.

3. What is JSX?

JSX (Javascript XML) allows you to write syntax like HTML in Javascript.

JSX

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const element =

Hello, World!

;

4. What is Dom Virtual?

Light representation of the real DOM that reacts to use to optimize rendering by renewing only what changes.

5. What props react?

Props (property) is only input reading that passes data from parents to child components.

6. What are the circumstances in reacting?

The default object to store data that can change in components. When things change, UI reappears.

JSX

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Const [count, setCount] = Usestate (0);

7. Is the hook in reacting?

Hooks allows you to use the status and life cycle features in functional components. Example:

8. What is Beneffect ()?

Executing side effects such as fire calls, subscriptions, and time regulators.

JSX

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Useeffect (() => {
fetchdata ();
}, []);

9. What is conditional rendering?

Displays UI elements based on specific conditions using IF, Ternary (? :), or logical operators and (&&).

10. Controlled components vs uncontrollably

• Controlled: Managed with a state of reacting.

• Uncontrollable: Managed by Dom Refs.

11. Does that raise the situation?

Move the situation to the same ancestors to share data between components of siblings.

12. What is the context in react?

Ways to share global data without passing teaching aids manually through each level.

JSX

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const mycontext = react.createcontext ();

13. What is the key to reacting?

Unique identification for listing items, helps react efficiently managing updates.

14. What is Prop drilling and how to avoid it?

Prop drilling occurs when the props are passed through many layers. Avoid using:

• State management libraries such as Redux or Zustand

15. How do you handle the event at React?

React uses Camelcase’s syntax for event handling.

JSX

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Click me

16. What is React.Memo ()?

High level components that prevent unnecessary re-de-lender if the props do not change.

17. Usememo vs. Usecallback

• You are in the invitation: Cache computing value.

• Usecallback: Reference to the cache function.

18. Is that lazy reaction charge?

Delaying the loading of components until it is needed using react.lazy () and tension.

JSX

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const lazycomp = react.lazy (() => import (‘./ lazycomp’));

19. What is reconciliation?

The react process compares the new and long virtual doms to apply only the necessary changes.

20. The server component reacts

Render the components on the server and send HTML to the client, reduce the size of the javascript bundle.

21. What is the compiler of React (React forgot)?

The optimization of the manufacturing time that moves components automatically.

22. What is the act of reacting in React 19?

The server side function is bound to the UI event, stated by “use the server”.

23. How to be improved () improve performance?

Marking updates as a low priority, maintaining critical UI updates remaining responsive.

24. What is hydration in reacting?

Attach the event listener to the HTML that is dragged by the server so that it becomes interactive.

25. How to optimize performance in large react applications

• Code Separation (React.lazy)

• Memoization (usemo, react.memo)

• Virtualization (react-window)

• Throttle/DeboCe Severe computing

• Avoid unnecessary re-degens

Last thought

Do you Prepare for the developer interview to react Or do one, this Reacting interview questions with solutions Make sure both candidates and recruitment managers are well prepared.

If you need it The Development Team Reacts Skilled To turn on your product vision, Starting a digital solution provide high -performance applications and can be adjusted Companies, startups, and businesses funded by seeds.

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