React Native Interview Questions – Set 03

by

What is meant by Gesture Responder System?

It is an internal system of React Native, which is responsible for managing the lifecycle of gestures in the system. React Native provides several different types of gestures to the users, such as tapping, sliding, swiping, and zooming. The responder system negotiates these touch interactions. Usually, it is used with Animated API. Also, it is advised that they never create irreversible gestures.

What is meant by HOC in React Native?

HOC Stands for Higher-Order Component. It is a technique, which allows you to reuse the component logic. It is a function that takes a component and gives back a new component.

Syntax

const NewComponent = higherOrderComponent(WrappedComponent);

Which database is best for React Native?

The most popular database for React Native is an SQLite database.

What are the best UI Components for React Native?

The best UI component for React Native are:

  • Material UI
  • Semantic UI
  • React Bootstrap
  • React Toolbox
  • Ant Design

List Step to Create and start a React Native App?

The following steps are necessary to create and start a React Native app:

Step-1: Install Node.js

Step-2: Install react-native environments by using the following command.

$ npm install -g create-react-native-app
Step-3: Create a project by using the following command.

$ create-react-native-app MyProject
Step-4: Next, navigate in your project by using the following command.

$ cd MyProject
Step-5: Now, run the following command to start the project.

$ npm start

What is the difference between React and React Native?

The essential differences between React and React Native are:

  • React is a JavaScript library, whereas React Native is a JavaScript framework based on React.
  • Tags can be used differently in both platforms.
  • React is used for developing UI and Web applications, whereas React Native can be used to create cross-platform mobile apps.

Explain React Native?

React Native is an open-source JavaScript framework introduced by Facebook. It is used for developing a real, native mobile application for iOS and Android platforms. It uses only JavaScript to build a mobile app. It is like React, which uses native components rather than using web components as building blocks. It is cross-platform, which allows you to write code once and can run on any platform.

React Native application is based on React, a JavaScript library developed by Facebook and XML-Esque markup (JSX) for creating the user interface. It targets the mobile platform rather than the browser. It saves your development time as it allows you to build apps by using a single language JavaScript for both Android and iOS platforms.

Is React Native a Native mobile app?

Yes, React Native is a native mobile app, which compiles a native mobile app using native app components. It is neither a Hybrid mobile app that uses WebView to run the HTML5 app nor a mobile web app. The React Native framework builds a real mobile app, which is indistinguishable from an app built using Objective-C/Swift or Java.

What does React Native Packager do in the React Native?

The React Native Packager performs the following functionalities:

  • The React Native Packager combines all the JavaScript code of your application into a single file and then translate any of the JavaScript code that your device won’t understand like JSX.
  • It also converts the assets (e.g., PNG file) used in your project into objects, which can be displayed by an Image component.

How to use firebase in react native?

Firebase is a popular tool for mobile and web app development platform. It provides many services to help you in building fast and high-quality apps, grow your user base, and earn more money without managing infrastructure. It is a powerful Database as a Service (DBaaS) tool, which provides a scalable cloud database to store and sync data for client and server-side development. Some of the key features of firebase are authentication, Real-time database, cloud messaging, crash reporting, and analytics. Firebase is a type of freemium model, not an open-source model. However, you can use its services free until you don’t pass the limits of its free tier.

We can get started with firebase by using following steps:

  • First, login into the firebase console and then create a project.
  • Retrieve apikey, authDomian, DatabaseURL, and storage bucket from the console.
  • Next, you need to create a new React Native project
  • Install firebase plugin from npm
  • Add firebase plugin into the React Native project