React Native Interview Questions and Answers for experienced

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100 React Native Interview Questions and Answers

  1. What is React Native?

    • Answer: React Native is a JavaScript framework for building native mobile apps using React. It allows developers to build cross-platform applications (iOS and Android) using a single codebase, leveraging the power of JavaScript and React's component-based architecture. Unlike hybrid app approaches, React Native renders native UI components, resulting in a more native-like user experience.

  2. Explain the difference between React and React Native.

    • Answer: React is a JavaScript library for building user interfaces (UIs) for web applications. React Native builds upon React's principles but targets mobile platforms. React renders to the DOM (Document Object Model) in the browser, while React Native renders to native UI components on iOS and Android. While they share similar concepts like components and JSX, their rendering mechanisms and target platforms differ significantly.

  3. What are JSX and its benefits in React Native?

    • Answer: JSX is a syntax extension to JavaScript that allows you to write HTML-like code within your JavaScript. In React Native, JSX is used to define the UI structure of your components. Benefits include improved readability, easier maintenance, and a more intuitive way to build complex UIs compared to using only JavaScript.

  4. Explain the concept of components in React Native.

    • Answer: Components are reusable building blocks of React Native applications. They encapsulate UI elements and their associated logic, promoting code reusability, maintainability, and organization. They can be functional components (simple functions) or class components (using ES6 classes), and can be nested to create complex UIs.

  5. What are props and state in React Native?

    • Answer: Props are immutable data passed down from a parent component to a child component. State is mutable data that's managed internally within a component; changes to the state trigger re-renders of the component. Props are used for unidirectional data flow, while state manages internal component changes.

  6. How does navigation work in React Native? Mention popular libraries.

    • Answer: React Navigation and React Native Navigation are popular libraries for navigation in React Native. They provide ways to manage transitions between different screens or views in your app using stacks, tabs, drawers, etc. They handle the transition animations and manage the navigation history.

  7. Explain the lifecycle methods of a React Native component.

    • Answer: React Native components have lifecycle methods that are called at different stages of the component's existence. Key methods include `componentWillMount`, `componentDidMount`, `componentWillReceiveProps`, `shouldComponentUpdate`, `componentWillUpdate`, `componentDidUpdate`, `componentWillUnmount`. These methods allow you to perform actions at specific points in the component's lifecycle, such as fetching data, updating the UI, and cleaning up resources.

  8. How do you handle asynchronous operations in React Native?

    • Answer: Asynchronous operations, such as network requests, are typically handled using Promises, async/await, or libraries like Axios or fetch. These methods allow you to perform background tasks without blocking the main thread and update the UI once the operations are complete, often using state updates within the component.

  9. What are FlatList and SectionList, and when would you use them?

    • Answer: FlatList and SectionList are optimized components for rendering lists of data in React Native. FlatList is suitable for simple lists, while SectionList allows you to render lists with sections or headers. They are efficient for rendering large datasets because they only render the visible items, improving performance.

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