Pupa Clic React Native Developer Interview Questions and Answers

Sorting an array and using HOC components and Flux in React Native

• To sort an array, use the sort() method

• To use HOC components, create a higher-order function that returns a component

• To use Flux in React Native, install the flux package and create actions, stores, and a dispatcher

Answering questions related to Redux, props, hooks in React Native and its tools

• Redux is a state management library for JavaScript applications

• Props are short for properties and are used to pass data between components

• Hooks are functions that allow you to use state and other React features without writing a class

• React Native tools include Expo, React Native Debugger, and Xcode

• Expo is a set of tools and services for bui...read more

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

Event loop is a mechanism in JavaScript that allows for asynchronous operations to be executed in a non-blocking way.

• Event loop is responsible for handling asynchronous operations in JavaScript.

• It allows for non-blocking execution of code by moving asynchronous tasks to the event queue.

• Event loop continuously checks the call stack and the event queue, moving tasks from the queue to the stack when the stack is empty.

• Exa...read more

Closures are functions that have access to their own scope, as well as the scope in which they were defined.

• Closures allow functions to access variables from their outer scope even after the outer function has finished executing.

• They are commonly used to create private variables in JavaScript.

• Closures are created whenever a function is defined within another function.

Seeking new challenges and growth opportunities in a more innovative environment.

• Desire for professional growth

• Seeking new challenges

• Looking for a more innovative environment

MVVM is a design pattern that separates the UI from the business logic by introducing a middle layer called ViewModel.

• Model-View-ViewModel design pattern

• ViewModel acts as a link between the Model and View

• Data binding is used to connect the ViewModel to the View

• Updates in the ViewModel automatically reflect in the View

SSL pinning is a security measure used to prevent man-in-the-middle attacks by associating a specific SSL certificate with a particular app.

• SSL pinning involves hardcoding the expected SSL certificate or public key within the mobile app.

• This helps verify the server's identity and prevent attackers from intercepting and decrypting communication.

• SSL pinning can be implemented using libraries like TrustKit or manually by ...read more