Senior React Native Developer Interview Questions and Answers

React Native Unit Testing involves testing individual components or functions in isolation. TDD stands for Test-Driven Development, a practice where tests are written before the actual code.

• React Native Unit Testing involves writing tests to verify the behavior of individual components or functions.

• TDD (Test-Driven Development) is a software development practice where tests are written before the actual code.

• TDD helps in ensuring that the code meets the requirements and is ea...read more

Handle multiple themes by using a theme provider and context in React Native.

• Create a ThemeProvider component to wrap the entire application.

• Use React context to pass the theme data down the component tree.

• Allow users to switch themes by updating the context value.

• Use conditional rendering based on the current theme in components.

React Hooks are a feature introduced in React 16.8 to allow functional components to have state and lifecycle methods.

• React Hooks are functions that let you use state and other React features in functional components.

• Commonly used hooks include useState, useEffect, useContext, and useReducer.

• Hooks are used in the coding test to demonstrate understanding of managing state and side effects in React components.

Performance optimization in React Native involves reducing unnecessary re-renders, using native modules, code splitting, and image optimization.

• Use shouldComponentUpdate or React.memo to prevent unnecessary re-renders

• Utilize native modules for performance-critical tasks

• Implement code splitting to load only necessary components

• Optimize images by using compressed formats and lazy loading

Implementing a FlatList in React Native for efficient data rendering.

• Use FlatList for large data sets to improve performance.

• KeyExtractor prop helps in uniquely identifying items.

• RenderItem prop defines how each item is displayed.

• Use initialNumToRender to optimize initial loading.

• Implement onEndReached for pagination or infinite scrolling.

Context is a built-in feature in React for managing global state, while Redux is a separate library for managing state in React applications.

• Context is simpler to set up and use compared to Redux.

• Redux is more powerful and scalable for larger applications with complex state management needs.

• Context is recommended for simpler state management needs, while Redux is recommended for more complex state management.

• Redux has a centralized store and follows a unidirectional data flow...read more

Redux is a state management library, while RTK Query simplifies data fetching and caching in React applications.

• Redux provides a predictable state container for JavaScript apps, allowing for centralized state management.

• RTK Query is built on top of Redux Toolkit and offers a powerful toolset for data fetching and caching.

• With Redux, you manage state through actions and reducers, while RTK Query abstracts this with endpoints and hooks.

• Example: In Redux, you might dispatch an a...read more