Gravit InfoSystems React Native Developer Interview Questions and Answers

Q1. Higher order function
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Q2. Component life cycle in react
Ans. 
Component life cycle in React refers to the series of methods that are invoked at different stages of a component's existence.
• Mounting: constructor, render, componentDidMount

• Updating: render, componentDidUpdate

• Unmounting: componentWillUnmount
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Q1. How do you maintain code quality
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Code quality is maintained through code reviews, automated testing, coding standards, and continuous integration.
• Regular code reviews by peers to catch errors and ensure best practices are followed

• Implementing automated testing to catch bugs early in the development process

• Enforcing coding standards and guidelines to maintain consistency and readability

• Utilizing continuous integration tools to automate the build and te
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Q1. A*b = 104, possible values of a and b.
Ans. 
The possible values of a and b that satisfy the equation a*b = 104.
• Possible values of a and b are (1, 104) and (104, 1).

• Factors of 104 are (1, 104), (2, 52), (4, 26), (8, 13).
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Q2. Hello world program in java.
Ans. 
A simple program that prints 'Hello, World!' in Java.
• Create a class with a main method.

• Use System.out.println() to print 'Hello, World!'.
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Q1. Difference between functional and class based component
Ans. 
Functional components are stateless and use functional programming concepts, while class components are stateful and use object-oriented programming concepts.
• Functional components are simpler and easier to read and test.

• Class components have access to lifecycle methods and state.

• Functional components are preferred for simple UI components, while class components are preferred for complex UI components.

• Functional compon...read more
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Q2. Have you ever worked on native components
Ans. 
Yes, I have worked on native components.
• I have experience in creating custom native modules for React Native apps.

• I have integrated native libraries like Firebase, Google Maps, and Camera into React Native apps.

• I have used native UI components like TextInput, ScrollView, and FlatList in React Native apps.

• I have also worked with native modules for iOS and Android separately.
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Q3. What are hooks and what are the hooks you have used
Ans. 
Hooks are functions that allow you to use state and other React features without writing a class.
• useState() - for managing state in functional components

• useEffect() - for performing side effects in functional components

• useContext() - for consuming context in functional components

• useReducer() - for managing complex state in functional components

• useCallback() - for memoizing functions in functional components
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Q1. Asked about projects and some questions based on it
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Q2. What is Hermes engine
Ans. 
Hermes is a JavaScript engine optimized for React Native apps.
• Developed by Facebook to improve app startup time and reduce memory usage.

• Uses ahead-of-time compilation to convert JavaScript code into bytecode.

• Supports ES6 syntax and is compatible with most React Native libraries.

• Can be enabled in React Native projects by adding a single line to the configuration file.
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Q3. Are you familiar with new architecture of React native
Ans. 
Yes, I am familiar with the new architecture of React Native.
• The new architecture of React Native is based on Fabric, a C++ UI framework.

• It separates the UI rendering from the JavaScript thread, resulting in improved performance.

• It also introduces new features like TurboModules and JSI for better native module integration.

• The new architecture is being gradually rolled out in React Native releases.

• It requires some chang...read more
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Q1. Difference between == and === in JavaScript
Ans. 
The difference between == and === is that == compares values after type coercion while === compares values and types.
• The double equals (==) operator compares values after type coercion.

• The triple equals (===) operator compares values and types.

• Type coercion is the process of converting one data type to another.

• Type coercion can lead to unexpected results.

• For example, 1 == '1' is true because the string '1' is coerced t...read more
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Q1. Explain about protocol extensions
Ans. 
Protocol extensions in iOS allow adding functionality to existing protocols without modifying the original protocol definition.
• Protocol extensions can provide default implementations for protocol methods.

• They can also add new methods and properties to conforming types.

• Protocol extensions are useful for adding common functionality to multiple types that conform to a protocol.

• Example: extending the Equatable protocol to ...read more
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Q2. Difference between merge and rebase
Ans. 
Merge combines changes from different branches, while rebase moves the entire branch to a new base commit.
• Merge creates a new commit to combine changes, while rebase rewrites commit history.

• Merge preserves the commit history of all branches, while rebase creates a linear history.

• Merge is non-destructive and keeps the original branch intact, while rebase modifies the branch being rebased.

• Example: 'git merge feature-bran
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Q3. Explain about Protocol equitability
Ans. 
Protocol equitability ensures that all participants in a communication protocol have equal access and opportunity to send and receive data.
• Ensures fair and equal treatment of all participants in a communication protocol

• Prevents any participant from having an unfair advantage or disadvantage

• Promotes transparency and inclusivity in communication protocols
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They asked , some cording question related to react js , html

Q1. Basic of Swift and Objective C
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Q1. Pure Technical Asking about your Project
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Q1. Salary Descussion with HR and normal HR Question
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Q1. Basic iOS Questions which you can find from the internet What is Class & Structure Optional, Tupple
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Q1. Tricky question based upon manager Team management Handling multiple junior developers under you.
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Q1. What are your salary expectations?
Ans. 
I expect a competitive salary based on my experience and skills.
• I have a strong background in iOS development and have successfully completed several projects.

• I am familiar with the latest technologies and frameworks in iOS development.

• I have a proven track record of delivering high-quality code on time and within budget.

• I am confident that my skills and experience make me a valuable asset to any team.

• I am open to disc...read more
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Q2. Share details of your previous job.
Ans. 
I worked as an iOS Developer at XYZ Company.
• Developed and maintained iOS applications using Swift and Objective-C.

• Collaborated with cross-functional teams to gather requirements and deliver high-quality products.

• Implemented new features and enhancements based on user feedback.

• Optimized app performance and resolved bugs and issues.

• Worked on integrating third-party libraries and APIs.

• Participated in code reviews and prov...read more
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Q3. Why are you looking for a change?
Ans. 
I am looking for a change to explore new opportunities and challenges in my career.
• Seeking growth and advancement in my professional journey

• Want to work on more challenging projects

• Desire to learn new technologies and expand my skillset

• Looking for a better work-life balance

• Seeking a company culture that aligns with my values and goals
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Q4. Tell me about yourself.
Ans. 
I am an experienced iOS developer with a passion for creating user-friendly and efficient applications.
• I have been developing iOS applications for over 5 years.

• I am proficient in Swift and Objective-C programming languages.

• I have experience working with various frameworks and libraries such as UIKit, Core Data, and Alamofire.

• I have a strong understanding of iOS design patterns and best practices.

• I have successfully del...read more
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