Top 5 React Native interview questions

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So you're getting ready for your next interview in mobile development? You've come to the right place if you want to get a job in React Native app development company. 



The interviewer will put your React Native knowledge to the test, so make sure you're prepared for any queries. I'll go over some of the most popular React Native interview questions and answers in this blog so you can confidently demonstrate your understanding of the technology.


  1. What is React Native?


React Native is a JavaScript-based mobile application framework that allows coders to utilize React alongside the native mobile platform to construct mobile apps for iOS and Android. The main benefit of React Native is that code can be written once and shared across both iOS and Android platforms. Javascript can be used to develop mobile applications that are "native" in terms of look and feel.


  1. What's the difference between a FlatList and a ScrollView?


In a React Native app, both ScrollView and FlatList are used to display a list of components. ScrollView, on the other hand, has a performance disadvantage. As soon as the component is loaded, ScrollView will load all of the items. As a result, all data is kept in RAM, and the larger the amount of data, the slower the speed.


FlatList, on the other hand, renders items slowly; by default, it will display 10 items on the screen, with more appearing as the user scrolls the view. For a small number of things, use ScrollView, and for a large number of items, use FlatList.


  1. How does React-native differ from ReactJS?

Scope of Application


ReactJs - React is a JavaScript package that allows you to create Responsive User Interfaces for web applications. React Native is a framework for generating native-feeling mobile applications. Both React and React Native utilize the JSX (JavaScript XML) syntax, but React uses html tags like div>, h1>, p>, and so on, whereas React Native uses html tags like view>, text>, and so on.


Gestures and Animation


To achieve animations for a web page, React leverages CSS animations on a large scale, whereas the Animated API supplied by React-Native is the recommended technique to animate a component.


Mechanism for Routing


React Native provides a built-in Navigator library for navigating mobile applications. React employs a react-router for routing and does not have any built-in routing capabilities.


  1. How does React Native's Virtual DOM work?


React Native creates an in-memory data structure cache, calculates differences, and then effectively updates the visible DOM of the browser. Despite the fact that the React libraries only render the subcomponents that change, this allows developers to code as though the entire page is rendered on each change.


  1. What is the best way to acquire geolocation in React Native?


The geolocation API adds to the geolocation web specification. Android uses the android.location.API for geolocation. To leverage the new Location Services API with React Native, the following alternative libraries are used.


React-native-geolocation-service

React-native-location


The following code must be put in the AndroidManifest.xml file of the application to request location access.


Final Thoughts


Although there are many different interview questions about React Native that you could be asked, I believe the five questions listed above cover the most prevalent subjects. So go over the answers one again to ensure you're ready for your forthcoming React Native interview.


If you want to know more about React Native app development services, you can have a detailed conversation with our React Native experts. Contact us!
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