Tech Curve AI & Innovations Co React Native Developer Interview Questions and Answers

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

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

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).

A simple program that prints 'Hello, World!' in Java.

• Create a class with a main method.

• Use System.out.println() to print 'Hello, World!'.

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

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.

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

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.

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

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

States are mutable data managed within a component, while props are immutable data passed from parent to child components.

• States are managed within a component and can be changed using setState method

• Props are passed from parent to child components and are immutable

• States are used for internal component data management, while props are used for passing data between components

• Example: A counter component may have a stat...read more

Data can be passed from children to parents in React components by using callback functions.

• Use callback functions to pass data from child components to parent components

• Parent component passes a function as a prop to child component

• Child component calls the function with the data as an argument to pass data to parent component

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

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

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

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

MVVM is a design pattern that separates UI code from business logic and data models.

• MVVM stands for Model-View-ViewModel

• Model represents the data and business logic

• View displays the UI and user interactions

• ViewModel acts as a mediator between Model and View

• ViewModel exposes data and commands to View

• MVVM helps in testability, maintainability and scalability of code

MVC is a software architecture pattern that separates an application into three interconnected components: Model, View, and Controller.

• Model represents the data and business logic of the application

• View displays the data to the user and handles user input

• Controller handles user input and updates the model and view accordingly

• MVC promotes separation of concerns and modularity

• Example: iOS app with a login screen - Model ...read more