Interview questions on React Native asked in multinational corporations (MNCs), along with explanations:
- What is React Native, and how does it differ from React?
- Answer: React Native is an open-source framework developed by Facebook for building cross-platform mobile applications using JavaScript and React. It allows developers to write mobile applications using React’s declarative component-based approach, sharing a significant portion of the codebase between iOS and Android platforms. React Native differs from React in that it uses native components instead of web components for rendering UI elements, resulting in a more native look and feel for mobile applications.
- Explain the difference between state and props in React Native.
- Answer: In React Native, state and props are both used to manage and pass data to components, but they serve different purposes. State represents the internal data of a component that can change over time, and it is managed within the component itself using the
setState()method. Props (short for properties) are immutable data passed from a parent component to a child component, allowing the parent to communicate with its children. While state is mutable and managed internally by the component, props are read-only and cannot be modified by the component itself.
- Answer: In React Native, state and props are both used to manage and pass data to components, but they serve different purposes. State represents the internal data of a component that can change over time, and it is managed within the component itself using the
- What are the advantages of using React Native for mobile app development?
- Answer: React Native offers several advantages for mobile app development, including:
- Cross-platform development: Write once, run anywhere approach, allowing developers to build apps for both iOS and Android platforms using a single codebase.
- Fast development cycles: Hot reloading feature allows developers to instantly see the changes they make to the code without recompiling the entire application, speeding up the development process.
- Reusable components: React Native’s component-based architecture promotes code reusability, making it easier to maintain and scale applications.
- Access to native APIs: React Native provides access to native APIs and modules, allowing developers to integrate platform-specific features and functionality into their applications.
- Answer: React Native offers several advantages for mobile app development, including:
- Explain the purpose of AsyncStorage in React Native.
- Answer: AsyncStorage is an asynchronous, persistent, key-value storage system provided by React Native for storing data locally on the device. It allows developers to store simple data types (such as strings, numbers, and JSON objects) asynchronously and persistently, even when the application is closed or the device is restarted. AsyncStorage is commonly used for storing user preferences, authentication tokens, and other small amounts of data that need to be accessed across different sessions of the application.
- What is the role of Flexbox in React Native layout design?
- Answer: Flexbox is a layout model provided by React Native for building responsive and flexible UI layouts. It allows developers to create complex layouts by distributing space among child components within a container along a single axis (either horizontally or vertically) or both axes. Flexbox simplifies the process of building UI layouts by providing a set of properties and values for controlling the alignment, distribution, and sizing of components. It is widely used in React Native development for creating responsive UI designs that adapt to different screen sizes and orientations.
Understanding these concepts is essential for React Native developers, especially when aiming for positions in multinational corporations where a strong understanding of React Native development principles and best practices is highly valued.