React Native Interview Questions For Experienced
22 Popular React Native Interview Questions for Experienced Professionals
React Native Interview Questions For Experienced
React Native is a popular open-source JavaScript library used for developing native mobile applications. Experienced React Native developers are expected to have a good understanding of React Native concepts and hands-on experience with building cross-platform mobile applications using this technology. During an interview, they may be asked questions related to React Native architecture, component lifecycle, debugging, performance optimization, and working with external libraries and APIs. They may also be tested on their knowledge of JavaScript, DOM manipulation, and state management. Employers may also inquire about their experience with integrating React Native with other technologies and tools. In addition to technical skills, they may also be evaluated on their problem-solving abilities and communication skills.
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1 - What is React Native?
React Native is an open source mobile application development framework created by Facebook. It allows developers to build mobile applications using JavaScript and a group of reusable components. It is based on React, a popular JavaScript library, and offers a fast, efficient, and easy way to build native mobile apps for both iOS and Android platforms.
2) How is React Native different from other cross platform frameworks?
React Native uses a different approach than other cross platform frameworks, such as Xamarin or Ionic. It does not use web views to render the application, instead, it uses native components that are compiled to native code. This allows the app to have a more native look and feel, better performance, and access to device features such as camera or geolocation.
3) Can you explain the concept of virtual DOM in React Native?
React Native uses a virtual DOM (Document Object Model) to efficiently update the user interface. The virtual DOM is a representation of the actual DOM and is used to keep track of changes to the UI. When there is a change in the data, the virtual DOM checks for differences between the current DOM structure and the new one. It only updates the necessary components, making the process faster and more efficient.
4) How does React Native handle device specific code?
React Native provides a single codebase for both iOS and Android platforms. However, it allows developers to write device specific code using platform specific file extensions. For example, developers can use the .ios or .android extension to create platform specific components, allowing them to have a more native feel.
5) What are some limitations of React Native?
One limitation of React Native is that it is not suitable for building complex, graphics heavy applications. It also lacks support for certain native features, such as Face ID on iOS and Bluetooth on Android. Additionally, developers may face some challenges when integrating third party libraries or implementing complex animations.
6) What are the advantages of using React Native?
React Native offers several advantages for mobile app development, including code reusability, faster development, and easier maintenance. As it uses a single codebase for both platforms, it also reduces the development time and cost. It also allows for a hot reloading feature, which makes the development process more efficient and faster.
7) How does React Native handle state management?
React Native uses its state management system called Redux. Redux is a predictable state container that manages the data flow in React Native applications. It allows developers to store and update application state in a central location, making it easier to manage and access the data across the app.
8) Can you explain the concept of props in React Native?
Props (short for properties) are used to pass data from a parent component to a child component in React Native. It allows for a unidirectional data flow, where data can only be passed downwards from parent to child. Props are read only, meaning they cannot be modified by the child component.
9) How does React Native handle styling?
React Native uses inline styling to style components. It uses a subset of CSS called JavaScript Style Sheet (JSX) that allows developers to write CSS directly in their JavaScript code. This approach makes it easier to create reusable components and allows for better code organization.
10) Can React Native apps access native device features?
Yes, React Native apps can access native device features by using Native Modules. Native Modules are bridges that allow communication between the native code and the JavaScript code. Developers can use Native Modules to access device features such as camera, geolocation, or push notifications.
11) How does React Native handle navigation in apps?
React Native has its built in navigation library called React Navigation. It allows for smooth and efficient navigation between screens in an app. It supports stack, tab, and drawer navigation, making it easier to create complex navigation flows.
12) Can you explain the role of JSX in React Native?
JSX (JavaScript XML) is an extension to the JavaScript language that allows developers to write HTML like code in their JavaScript files. It allows developers to mix HTML and JavaScript, making the code more readable and easier to maintain. JSX code is transpiled to plain JavaScript code during compilation.
13) How does debugging work in React Native?
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React Native provides a debugging tool called Chrome Developer Tools (for Android) and Safari Developer Tools (for iOS). Developers can use these tools to inspect elements, view console logs, and debug their code. It also has a built in remote debugging feature for devices connected via USB.
14) Can React Native apps be published on app stores?
Yes, React Native apps can be published on app stores just like any other native app. They go through the same process of app store reviews and must follow the same guidelines. React Native also provides tools for over the air updates, making it easier to push updates to the app without going through the app store review process.
15) What are some popular apps built with React Native?
Some popular apps built with React Native include Facebook, Instagram, UberEats, Skype, and Tesla. It is also gaining popularity among startups and small businesses due to its cost effective and efficient development process.
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