Mphasis React Native Developer Interview Questions and Answers

React Native is a framework for building mobile applications using JavaScript and React.

• React Native is a cross-platform framework developed by Facebook.

• It allows developers to build mobile apps using JavaScript and React.

• It uses native components to render UI elements, resulting in a native-like performance.

• Code written in React Native can be shared between iOS and Android platforms.

• It provides a rich set of pre-built...read more

Redux is a predictable state container for JavaScript apps. React Navigation is used for navigation in React Native.

• Redux is a state management library commonly used with React to manage application state in a predictable way.

• It helps in maintaining a single source of truth for the state of the entire application.

• Redux works by having a central store that holds the entire state tree of the application.

• React Navigation ...read more

Class components and functional components are two ways to create components in React Native.

• Class components are created using ES6 class syntax and extend the React.Component class.

• Functional components are created using JavaScript functions.

• Class components have a state and lifecycle methods, while functional components do not.

• Functional components are simpler and easier to test and maintain.

• Class components are reco...read more

Context is a feature in React that allows data to be passed down the component tree without manually passing props. Hooks are functions that allow you to use state and other React features in functional components.

• Context is used to share data between components without passing props explicitly

• Hooks are functions that allow you to use state and other React features in functional components

• Context provides a way to pass...read more

Use props to pass data from parent component to child component, and use state to manage shared data between sibling components.

• Pass data from parent to child components using props

• Use state management libraries like Redux or Context API to share data between sibling components

• Use event emitters or callbacks to communicate between components

Concurrency in Swift can be handled using Grand Central Dispatch (GCD) and Operation Queues.

• Use GCD to perform tasks concurrently by creating dispatch queues.

• Use Operation Queues to manage and execute multiple operations concurrently.

• Avoid race conditions by using serial queues or synchronization techniques like semaphores or locks.

iOS app distribution methods include App Store, Ad Hoc, Enterprise, and TestFlight.

• App Store distribution is for public release and requires Apple's review process.

• Ad Hoc distribution allows sharing apps with a limited number of devices.

• Enterprise distribution is for in-house apps within a company.

• TestFlight is for beta testing with external testers before App Store release.

MVVM is a design pattern that separates the UI, business logic, and data layers in an iOS application.

• Model: Represents the data and business logic of the application.

• View: Represents the UI components of the application.

• ViewModel: Acts as a mediator between the Model and View, handling the presentation logic and data binding.

• Pros: Separation of concerns, easier to maintain and test, promotes reusability.

• Cons: Increase...read more

Multithreading in Swift allows for concurrent execution of tasks to improve performance and responsiveness.

• Use Grand Central Dispatch (GCD) for managing concurrent tasks

• Avoid blocking the main thread to prevent UI freezes

• Consider using Operation and OperationQueue for more complex task management