React Native Interview Questions and Answers for 5 years experience

1. What is React Native and how does it differ from React?

   • Answer: React Native is a JavaScript framework for building native mobile apps using React. Unlike React, which renders to the DOM in a web browser, React Native renders to native UI components. This means the app feels and performs like a native app, not a web app in a wrapper. React focuses on building user interfaces for web applications, while React Native focuses on building user interfaces for mobile applications (iOS and Android). They share the same core concepts (components, JSX, state management), but their rendering targets and APIs are different.

2. Explain the concept of JSX in React Native.

   • Answer: JSX (JavaScript XML) is a syntax extension to JavaScript that allows you to write HTML-like code within your JavaScript code. In React Native, JSX is used to describe the UI of your app. It makes the code more readable and easier to understand than using only JavaScript functions to create UI elements. The JSX is then transpiled into regular JavaScript by tools like Babel before it runs in the browser or on a mobile device.

3. Describe different ways to manage state in a React Native application.

   • Answer: There are several ways to manage state in React Native, each with its own strengths and weaknesses:
     • useState hook (for component-level state): The simplest way to manage state within a functional component. It's ideal for small, self-contained pieces of state.
     • useReducer hook (for complex state logic): Suitable for managing more complex state that involves multiple actions and state updates. It uses a reducer function to update the state.
     • Context API (for global state): Allows you to pass data through the component tree without having to pass props down manually at every level. Useful for things like user authentication or theme settings.
     • Redux (for large applications): A predictable state container for JavaScript apps. It provides a centralized store for managing application state, making it easier to manage state in large and complex applications.
     • MobX (for large applications): Another popular state management library that uses observables and reactions to make state management more intuitive.

4. How do you handle navigation in a React Native application?

   • Answer: Popular navigation libraries include React Navigation and react-native-navigation. They provide components and APIs for managing navigation stacks, tabs, drawers, and more. These libraries handle transitions between screens and managing the navigation history. You define routes and screens, and the library handles the actual navigation logic.

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