React Native Coding Challenge

React Native Strategy:

This challenge tests multiple React Native concepts:

• State Management: useState/useReducer for todo state
• Async Storage: Persist todos locally
• Optimistic Updates: Update UI immediately, handle failures
• Component Design: Reusable TodoItem components
• Performance: FlatList for efficient rendering
• Mobile UX: Touch interactions and feedback

Implementation Approach:

1. Set up basic component structure with state
2. Implement AsyncStorage for persistence
3. Add optimistic updates for smooth UX
4. Create reusable TodoItem component
5. Handle loading states and error scenarios

React Native Best Practices Demonstrated:

1. Performance Optimizations:

• React.memo: Prevent unnecessary TodoItem re-renders
• useCallback: Memoize event handlers to prevent child re-renders
• FlatList: Efficient rendering for large lists with virtualization
• keyExtractor: Proper key handling for list performance

2. Mobile UX Patterns:

• activeOpacity: Visual feedback for touch interactions
• Optimistic updates: Immediate UI response for perceived performance
• Error handling: User-friendly alerts for failure scenarios
• Loading states: Proper feedback during async operations

3. React Native Specific Features:

• AsyncStorage: Proper local data persistence
• StyleSheet: Optimized styling with StyleSheet.create()
• Platform APIs: Using native device capabilities
• Component lifecycle: Proper cleanup and memory management

Follow-up Challenge Questions:

• "How would you add pull-to-refresh functionality?"
• "Implement offline sync with a REST API"
• "Add animations for todo item creation/deletion"
• "How would you handle very large lists (10k+ items)?"