When facing an interview, you must familiarize yourself with the common interview questions. This knowledge will give you the strength and the courage to answer all the questions correctly. Take a look at all the possible React native and native script interview questions you may encounter on your next job hunt.
- What Is React Native?
React Native reefers to a JavaScript code library developed by Instagram and Facebook. It was released in 2013 on GitHub, and its main task is to allow developers to reuse JavaScript codes on mobile and across the web. Ap [pd developers don’t have to design two different app codes for iOS and Android but instead reuse the initial one for both OS. And because iOS and Android have different code bases, it would be beneficial and time-saving to reuse the codes through react native.
2. What is native Script?
It’s a cross-platform JavaScript framework designed to allow developers to create native apps for Android and iOS using the same codebase. Native scrip framework allows JavaScript access to the user interface, iOS and Android rendering engine, and native APIs. With Native Script, framework developers can create Android and iOS apps offering a native user experience.
3. Mention the difference between Native Script and react native
- Native Script uses TypeScript, JavaScript, Angular, and Vuejs development language, while react native only uses JavaScript, a core development language.
- React Native allows faster app development compared to native Script. React native is characterized by reusable components that, once developed, can be reused on various mobile platforms. Contrary to react native, native Script has limited/few plugs, and some aren’t verified.
- Native Script uses angular, typescript, and Vuejs, which are slower, unlike react Native, which uses virtual; Dom, which ensures faster user interface update and higher performance.
- React Native doesn’t have pre-defined themes, while the native Script is equipped with various themes that enhance the User interface of different platforms.
4. Explain the NativeScript Application events
- Launch: this is an event created when the user launches an application
- Suspend: an event created once the user suspends an application
- Resume: when you resume an application that was suspended, a resume event is created
- Displayed: created when User interface elements are rendered
- orientation changed: it’s an event created when the user changes the device orientation
- low memory: raised when the device memory is low
- uncaught error: it’s a native script event created in the presence of uncaught application error
- exist: an event initiated when the application is to be closed
5. Why should you choose react Native?
The reason why react Native is a better choice is due to the following reasons;
- Has open-source framework
- It’s easy to use
- As low code sharing
- Provides native feel and look
- Saves time and effort
- Faster development
- Cross-platform compatibility
6. What are the components of React Native?
The essential components used in React native include
- Text: it’s the component that displays data information of texts in the application
- textInput: functionality used for keying texts into the application through the keyboard
- View: it’s the core build-in component for building a user interface
- Image: React native components that display images in the mobile app
- Scroll view: refers to a scrolling container and hosts multiple views
7. What are the disadvantages of using React Native?
- React native is in the improvement stage; it’s still new and can’t be compared to android and iOS platforms. This means it has negative impacts on mobile applications.
- It’s not as comfortable as other cross-platform apps and takes time to learn and understand. JavaScript Syntax extension included in this platform makes it challenging to learn both JavaScript and HTML.
- Some react build-in apps show performance issues, especially if it requires advanced functionality. As a result, it may not person as much as native mobile applications.
- React Native is a cross-platform built-on JavaScript library, a fragile library that may have security concerns. As a result, it’s not a better option for developing banking, financial and condimental data apps.
8. Which threads run in React Native?
Two main threads run in react native, which include the JavaScript thread and the main UI thread.
9. Give an example of apps built with react native.
There are hundreds of native react build-in apps, but the common ones include Facebook, Instagram, Airbnb, Facebook Ads Manager, F8, Skype, Bloomberg, Myntra, Tesla, Gyroscope, and UberEats
10. Does NativeScript use WebView?
Unlike react Native, the native Script doesn’t use WebView. All it does is map the User Interface (UI) markup in your program code to the native components of Android and apple so the application can work as a native mobile app.
11. What are some of the companies that use native Script?
The popular companies that use native Script include PUMA, Hulu, Sennheiser, and Deloitte Digital.
12. What are the main NativeScript layout containers?
- Absolutelayout: this is the simplest native script layout. Absolute left-top coordinates are used to position the children.
- GridLayout: this layout arranges child elements in rows and columns (table structure)
- DockLayout: this layout offers a docking mechanism aimed at chelid elements to the center, left, right, top, or bottom of the layout.
- Stacklayout: it stacks child elements besides or below each other depending on the orientation.
- This layout is ideal for creating lists.
- WrapLayout: it’s the same as stacklayout except that it stacks child elements to one row/column and wraps the child elements to new columns and rows where there is no space left.
- FlexboxLayout
13. Advantages of NativeScript
- Native user experience: NS API generates all the controls that are used in the application to provide a native experience
Lower learning curve: it’s simple
- A coding system that needs little effort to learn and implement in your application creation projects. With JavaScript Knowledge, it’s even simpler working with native Script.
Good community support: like react native, NativeScript is also open source.
- And provide similar advantages of being an open source framework where developers support and help each other come up with a better project.
- Reusability of the code: nativescript is a cross-platform that allows a code written for iOS to be used in Android
- Free & open-source: NativeScript is open source; it’s free and requires no cost to use. Developers can contribute to making it a better crops platform for native apps.
14. Differentiate between React Native and react
- React native is a React-based framework, while react is a JavaScript library.
- We use JS to build web applications and UI, while react native is designed for developing cross-platform native apps.
- Both React and native react uses synonymous tags like <div>, <h2>, <h1> in react.js while react native uses tags like <view> <text>.
- App registry is used for app registration in react native, while path rendering of HTML tags is done using DOM in React.
15. What’s the difference between react elements and react components?
React element displays react components to be created, while react components are functions that accept inputs and then return elements.
16. State the similarities between React and react native
- Both have similar life cycle methods, i.e., componnetdidmount
- Similar component architecture
- Same management libraries
- Similar state & prop libraries.
17. What are refs in react?
Refs in react refer to escape patches providing access to DOM nodes/ react elements. Refs are used in the following instances
- Management of focus, text selection, media playback
- Triggering of imperative animations
- Intergrade with Third-party DOM libraries
18. What architectures are supported by React Native?
React Native bridges the JavaScript thread and native thread, and because of this feature, the JavaScript code will be able to communicate with the native API and the platform easily. In Android, react native bundles up with JavaScript core, while in iOS, it uses JavaScript core for all program codes. Despite offering improved native functionality, it also results in performance issues and device lagging.
19. What architectures are supported by NativeScript?
It follows MVVM or MVC architectural pattern and mainly works on CLI, plugins, and modules. NativeScript features multiple modules tasked with the activation of various features. The basic and most essential modules are the page module and root module. When these two come, they form an application module composed of actual business logic, XML-based UI codes, and CSS-style code.
20. React Native vs. NativeScript which one is suitable for complex app development?
NativeScript and react native offer guidelines, official documents, third-party libraries, plugins, and open-source projects for developing mobile app apps. Developing a complex app using react native isn’t as easy as using a nativescript. With react Native, you’ll need native development skills and JavaScript, which can be challenging if you are just a beginner. However, NativeScript is straightforward, and with the UI and XML support, developers can use the tree-shaking mechanism to build complex apps within the shortest time possible.
21. When do you choose NativeScript?
Developers can choose a native script for a reason listed below;
- When developing cross-platform apps
- When developing extensible APIs using build-in templets and plugins
- To avoid performance cases
- When you need a simple, accessible & catch user interface (UIs)
22. When do you need react native?
- To develop a quick MVP
- When building real-time apps capable of sending live updates
- When developing UI-specific mobile apps
- When building apps without the need for third-party plugins.
23. Is React Native native or hybrid?
Reactive is a mixture of both native and hybrid frameworks. Mobile apps are the same as native apps. But if the app needs access to device-specific features, then the native code will be used with the react native UI components. It’s at this point that reacts nativ3 becomes native and hybrid.
24. What is the prerequisite for learning react native?
Before you develop a mobile app using react native, you need the basic knowledge of web requests, API, ES6, and HTTP protocol. On top of that, you also need to understand HTML, NodeJS, HTM DOM, and CSS.
25. What’s the role of react native packager?
- Pack/combine JS codes in a single file
- Converts assets into objects displayable by image
- Translate JS codes for your device to understand
26. What are “state” and “props”?
They are plain JavaScript objects that control data within the components. Props refer to properties and are immutable parameters, while states are mutable parameters handled inside the container component.
27. How secure are NativeScript apps?
Native script apps can be as secure as you need them, depending on your coding knowledge. For instance, a developer can obfuscate/compress JavaScript code to tighten security around their apps. Jsscrambler is among the tools that you can use to archive this functionality during the development stage.
28. Can you maintain a code in NativeScript apps?
NativeScript emphasizes native functionality and needs minimal effort to discover the problem within your code. It will correct one single code base to clear all the errors within your codebase. Reusability of components is another functionality that makes it easy and more convenient to duplicate or reuse your base code to add more features to your application.
29. React Native Vs. NativeScript: what’s the minimum app size?
The simplest hello world builds with react native is about 7MB. Still, after adding dependencies, the size increase to 13.4MB. in fact, it can minimize storage space much better than the native Script. on the other hand, a simple native script app can be as large as 12MB but also smaller when compared to the size of native apps.
30. Is React Native the ideal framework?
It’s an ideal framework based on your dream app and its features. The react native apps use exposed APIs, check POC, are lightweight, and hold limited resources.
Conclusion
Suppose you were worried about the common interview questions on React Native Vs. NativeScript, then you are now informed. The questions and answers provided here should be enough. All you need is the courage to face the interning panel, and you’ll have a higher chance of passing the interview.
