React Native Interview Questions
React Native Interview Questions For Freshers
Let us start by discussing a few interview questions suitable for freshers with little to no working experience with React Native:
ReactJS is a popular JavaScript library used to build responsive user interfaces for web applications across the board. On the other hand, React Native is a framework used specifically for building powerful mobile applications, giving them a native feel. Moreover, while ReactJS does not have in-built routing capabilities and works with a react-router for routing purposes, React Native comes with an in-built navigator library to navigate mobile applications.
React Native allows users to enter text through a core component called TextInput. It contains an onChangeText prop with a function to be called whenever a user changes the text. It also has an onSubmitEditing prop with a function to be called whenever a user submits the text.
In React Native, prop drilling refers to a concept that revolves around the process of passing your data from a specific parent component to its child component. However, in between, other components that own the props pass the data down a chain.
It is a framework, so Angular Here are the major steps involved in integrating React Native into a working Android mobile application:
- Start by setting up React Native dependencies and a suitable directory structure
- Now, develop React Native components in JavaScript
- You can now add a ReactRootView to the concerned Android application. This view will become the container for the React Native component.
- Start your React Native server and run the native application
- Finally, verify that your React Native aspect of the application works as expected
Advanced React Native Interview Questions
Let us now move on to React Native interview questions for experienced professionals:
To begin with, the main thread starts code execution and loading JavaScript bundles when an application starts. Once the JavaScript code is successfully loaded, it is sent to another thread through the main thread. When JavaScript performs complicated calculations, this prevents the UI thread from getting hampered.
When React starts to render, the reconciler starts “deffing.” Once it generates a new virtual DOM, it sends the changes to a different thread, called a Shallow thread. The Shadow thread then calculates the layout and sends the layout parameter to the main thread. As only the main thread is capable of rendering anything on a mobile screen, the shadow thread should deliver the generated layout to the main thread, followed by UI rendering.
The main cause behind performance issues in React Native is every thread being incredibly fast. A React Native application may suffer from a performance bottleneck when you pass one thread to another without any reason. React Developers often follow the thumb rule of keeping the passes over the bridge to a minimum to tackle performance-related issues.
JavaScript automates memory management with the help of a garbage collector. Garbage collection is a background process that traverses the graph of allocated objects along with their references in a periodic fashion. If it encounters a portion of the graph that is not directly or indirectly referenced from the root objects, the entire portion can be deallocated from the memory.
In React Native, every JavaScript module is attached to a specific root object. Multiple modules, including React Native core ones, declare suitable variables kept in the main scope. These variables might retain other objects, thereby preventing them from garbage collection.
Secure Sockets Layer (SSL) and its successor, Transport Layer Security (TSL), are robust protocols used to establish authenticated and encrypted links between networked computers. Both these protocols work by binding identities of entities like companies and websites to cryptographic key pairs using digital documents called X.509 certificates.
SSL pinning is an optional mechanism used by developers to improve the security of their services or sites relying on SSL certificates. It allows users to specify a cryptographic identity to be accepted by website/application visitors.
Frequently Asked Questions
Will the demand for React Native developers increase in the future?
Looking at the rate at which mobile applications are built and companies worldwide are embracing digitization, it is safe to say that the demand for React Native developers will increase in the future. Irrespective of the trends prevalent in the industry, companies will always need skilled developers to build robust mobile applications.
What is the salary of React Native developers in India?
The React Native developers’ salary in India ranges from ₹6 lacs to as high as ₹22 lacs, depending on their skills and expertise. You can secure a high-paying job as a competent React Native developer by upskilling yourself and staying in sync with the ongoing trends.
Which notable companies use React Native for developing applications?
Here are some of the most notable companies that use React Native for developing applications:
- Skype
- Discord
- Bloomberg
- Walmart
- Uber Eats
- Tesla
What are the educational qualifications to become a React Native developer?
While there are no specific educational qualifications to become a React Native developer, graduates in fields like Computer Science have a better shot at landing jobs as computer programmers using React Native. However, even if you are not a Computer Science graduate or have no education in related fields, you can become a React Native developer by learning the technology from scratch.
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