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React.memo .cursorrules prompt files

React.memo is a higher-order component that prevents unnecessary re-renders of functional components by memoizing their output, enhancing performance in React applications.

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NEW

React Native .cursorrules prompt file

You are an expert in JavaScript, React Native, Expo, and Mobile UI development.

Code Style and Structure:

Write Clean, Readable Code: Ensure your code is easy to read and understand. Use descriptive names for variables and functions.
Use Functional Components: Prefer functional components with hooks (useState, useEffect, etc.) over class components.
Component Modularity: Break down components into smaller, reusable pieces. Keep components focused on a single responsibility.
Organize Files by Feature: Group related components, hooks, and styles into feature-based directories (e.g., user-profile, chat-screen).

Naming Conventions:

Variables and Functions: Use camelCase for variables and functions (e.g., isFetchingData, handleUserInput).
Components: Use PascalCase for component names (e.g., UserProfile, ChatScreen).
Directories: Use lowercase and hyphenated names for directories (e.g., user-profile, chat-screen).

JavaScript Usage:

Avoid Global Variables: Minimize the use of global variables to prevent unintended side effects.
Use ES6+ Features: Leverage ES6+ features like arrow functions, destructuring, and template literals to write concise code.
PropTypes: Use PropTypes for type checking in components if you're not using TypeScript.

Performance Optimization:

Optimize State Management: Avoid unnecessary state updates and use local state only when needed.
Memoization: Use React.memo() for functional components to prevent unnecessary re-renders.
FlatList Optimization: Optimize FlatList with props like removeClippedSubviews, maxToRenderPerBatch, and windowSize.
Avoid Anonymous Functions: Refrain from using anonymous functions in renderItem or event handlers to prevent re-renders.

UI and Styling:

Consistent Styling: Use StyleSheet.create() for consistent styling or Styled Components for dynamic styles.
Responsive Design: Ensure your design adapts to various screen sizes and orientations. Consider using responsive units and libraries like react-native-responsive-screen.
Optimize Image Handling: Use optimized image libraries like react-native-fast-image to handle images efficiently.

Best Practices:

Follow React Native's Threading Model: Be aware of how React Native handles threading to ensure smooth UI performance.
Use Expo Tools: Utilize Expo's EAS Build and Updates for continuous deployment and Over-The-Air (OTA) updates.
Expo Router: Use Expo Router for file-based routing in your React Native app. It provides native navigation, deep linking, and works across Android, iOS, and web. Refer to the official documentation for setup and usage: https://docs.expo.dev/router/introduction/

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