React Native Developer

React Native Developer Interview Questions and Answers for Freshers

Updated 19 Mar 2025

Q1. 1. What is git rebase used for? 2. What is Flipper used for? 3. What is useCallback? Explain with an example. 4. Is "let setState = useState()" valid syntax? How would you set state and print state with this sy...

Ans.

Answers to various technical questions related to React Native development.

1. Git rebase is used to reapply commits on top of another base tip. It is used to maintain a clean and linear project history.
2. Flipper is a mobile debugging tool for iOS and Android apps. It allows developers to inspect and debug their apps in real-time.
3. useCallback is a hook in React that returns a memoized callback function. It is used to optimize performance by preventing unnecessary re-renders...read more

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React Native is a framework for building mobile apps using React, while React JS is for web applications.

React Native allows developers to create mobile applications for iOS and Android using JavaScript and React.
React JS is primarily used for building user interfaces for web applications.
React Native uses native components, while React JS uses HTML elements.
Example: A button in React Native is a native button, while in React JS, it's an HTML button element.
React Native provi...read more

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useEffect and useState are React hooks for managing side effects and state in functional components; DOM refers to the document object model.

useState: A hook that allows you to add state to functional components. Example: const [count, setCount] = useState(0);
useEffect: A hook that lets you perform side effects in function components. Example: useEffect(() => { document.title = `Count: ${count}`; }, [count]);
DOM: The Document Object Model represents the structure of a documen...read more

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React Native works by running JavaScript code on a separate thread and communicating with native modules through a bridge.

React Native runs JavaScript code on a separate thread called the JavaScript thread.
It communicates with native modules through a bridge, which allows JavaScript to interact with platform-specific APIs.
The bridge passes messages between the JavaScript thread and the native modules, enabling seamless communication.
React Native uses a virtual DOM to efficien...read more

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Ans.

Axios is a promise-based HTTP client for making API requests in React Native applications.

Axios can be installed using npm: `npm install axios`.
To make a GET request: `axios.get('https://api.example.com/data')`.
To make a POST request: `axios.post('https://api.example.com/data', { key: 'value' })`.
Axios supports request and response interceptors for handling requests globally.
Error handling can be done using `.catch()` method: `axios.get(...).catch(error => console.error(error...read more

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React Native is a framework for building cross-platform mobile applications using JavaScript and React.

Allows developers to write code once and deploy it on both iOS and Android platforms
Utilizes native components for better performance and user experience
Supports hot reloading for faster development iterations

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