What is the difference between React Native and native
iOS development?
React Native allows developers to build iOS
applications using JavaScript and React, while native iOS development involves using
languages like Objective-C or Swift with the iOS SDK. React Native leverages native
components and APIs to render UI elements, resulting in a native-like user
experience. Native development provides direct access to platform-specific features
and can offer more performance optimizations.
Can you discuss the advantages and disadvantages of
relational databases compared to NoSQL databases?
The candidate should outline that relational
databases offer structured data storage and strong consistency, while NoSQL
databases provide scalability and flexibility for handling unstructured data.
How do you handle navigation in a React Native iOS
app?
React Navigation is a popular library used for
handling navigation in React Native iOS apps. It provides a declarative and
customizable way to define and manage navigation stacks, tabs, and drawers. It
allows developers to handle navigation events, pass parameters between screens, and
integrate with platform-specific navigation patterns.
How can you access device-specific features in React
Native iOS development?
React Native provides a bridge that enables
JavaScript code to communicate with native modules written in Objective-C or Swift.
These native modules allow access to device-specific features such as camera,
geolocation, and sensors. Developers can write custom native modules or use
pre-existing community-supported modules to interact with iOS APIs.
How does React Native handle performance optimization
in iOS apps?
React Native utilizes a mechanism called
"bridge" to communicate between JavaScript and native code. To optimize performance,
React Native minimizes the bridge overhead by batching UI updates and optimizing
data transfer. Additionally, React Native provides tools like
"shouldComponentUpdate" and "PureComponent" to avoid unnecessary re-rendering of
components.
How would you handle asynchronous operations, such as
network requests or data fetching, in a React Native iOS app?
The candidate should mention techniques like
using the Fetch API or third-party libraries (e.g., Axios) to make asynchronous
requests, handling promises or using async/await for managing asynchronous flow,
implementing error handling and retries, and optimizing network requests for
performance.
Suppose you need to integrate a third-party native
library into a React Native iOS app. How would you approach the integration process?
The candidate should discuss steps like
reviewing the library's documentation and compatibility with React Native, using
package managers like CocoaPods or manually linking the native dependencies,
integrating native code using Objective-C or Swift, handling bridging between
JavaScript and native code, and thoroughly testing the integration.
Describe your approach to handling different screen
sizes and orientations in a React Native iOS app
The candidate should explain techniques like
using Flexbox for responsive layouts, utilizing platform-specific components or
styles for adaptive UIs, handling orientation changes through React Native's
lifecycle methods, testing the app on different iOS devices or emulators, and
considering accessibility guidelines.
How would you handle state management in a complex
React Native iOS app?
The candidate should mention techniques like
using React Context API for global state management, employing state management
libraries like Redux or MobX, leveraging local component state for simple state
requirements, structuring the state to avoid unnecessary re-renders, and following
best practices for data flow and immutability.
Suppose you encounter a compatibility issue with a
specific iOS version while working on a React Native app. How would you handle it?
The candidate should discuss steps like
researching the issue and checking for community-supported solutions or patches,
testing the app on the problematic iOS version to reproduce the issue, debugging the
code and using React Native's development tools, and implementing workarounds or
alternative approaches to resolve the compatibility issue.
Can you describe a complex React Native iOS project
you worked on? What challenges did you face, and how did you overcome them?
The candidate should provide an example of a
complex React Native iOS project they were involved in, describe the specific
challenges faced (e.g., performance optimization, integrating complex native
libraries), and explain the actions they took to overcome those challenges. This
question evaluates problem-solving skills, adaptability, and technical expertise.
Tell us about a time when you had to collaborate with
designers or UX experts to implement UI/UX designs in a React Native iOS app.
The candidate should share an experience where
they worked closely with designers or UX experts, interpreted design specifications,
translated them into React Native components and styles, provided feedback or
suggestions for improving usability, and ensured the successful implementation of
the UI/UX in the app.
How do you stay up-to-date with the latest
developments in React Native and iOS app development?
The candidate should discuss their approach to
continuous learning, such as following React Native-related blogs or newsletters,
participating in React Native communities or forums, attending conferences or
meetups, experimenting with personal projects, and exploring official documentation
and release notes.
Describe a situation where you had to troubleshoot and
resolve a performance issue in a React Native iOS app. How did you handle the
situation, and what was the outcome?
The candidate should describe a scenario where
they identified and resolved a performance issue in a React Native iOS app. They
should explain how they diagnosed the issue, optimized the code or configuration,
utilized profiling or monitoring tools, and measured the impact of the improvements
on the app's performance.
How do you ensure code quality and maintainability in
a React Native iOS project?
The candidate should discuss their approach to
writing clean and modular code, following coding standards and best practices,
utilizing code linting and formatting tools, writing unit and integration tests,
conducting code reviews, utilizing Git or other version control systems effectively,
and documenting the codebase for easy maintenance and collaboration.
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