This test evaluates knowledge of React Native performance optimization, state management, navigation, testing, security, and other best practices for app development.

Use inline anonymous functions for rendering

How do you prevent unnecessary re-renders of FlatList items in React Native?

Which library provides gesture-driven interaction support paired well with react-native-reanimated?

App startup time, crash rate, API response times, and user engagement

Which metrics are important to track in production React Native apps?

Upgrade immediately without reading release notes

Use React Native Upgrade Helper and upgrade in a separate branch, testing carefully

What is the recommended method to upgrade React Native versions safely?

Using getItemLayout to skip item measurement

Re-rendering all list items on every update

Avoiding use of React.memo for list items

Which of the following strategies helps optimize FlatList performance when all items have a fixed height?

useMemo caches a computed value; useCallback caches a function reference

useMemo caches a function reference; useCallback caches a computed value

useMemo and useCallback both cache component state

They have the same purpose and are interchangeable

What is the main difference between useMemo and useCallback hooks in React Native?

Which state management solution is best suited for large React Native apps requiring middleware and time-travel debugging?

Using the built-in Animated API with useNativeDriver: true for all properties

Using react-native-reanimated to run animations on the UI thread via worklets

Performing layout animations solely on the JS thread

Using LayoutAnimation for all complex animations

How does React Native handle animations efficiently to maintain 60fps even when the main JS thread is busy?

Versioning each record, auto-merging non-overlapping changes, and surfacing conflicts for manual resolution

Ignoring conflicts and overwriting data on sync

What is a practical approach to conflict resolution in offline-first React Native apps?

Using absolute positioning for all components

Designing layouts solely for one screen size

Which layout system is recommended for handling different screen sizes and orientations in React Native?

What testing framework is commonly used for unit testing business logic in React Native?

Only handle when user taps the notification

How should push notifications be handled when the app is in the foreground?

Using the device keychain via react-native-keychain

Embedding secrets directly in source code

What method is recommended for securely storing sensitive data such as credentials in React Native?

Hardcoding all API URLs in the source code

Using react-native-config to load .env files for different environments

Using global variables without environment separation

Editing source code manually before each build

Which approach is recommended for handling environment-specific configuration in React Native projects?

To implement lazy-loading of components to reduce initial bundle size

What is the purpose of React.lazy() and Suspense in React Native?

react-hook-form combined with schema validators like zod or yup

Which tool is standard for writing complex forms with validation in React Native?

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