No,Category,Guideline,Description,Do,Don't,Code Good,Code Bad,Severity,Docs URL
1,Components,Use functional components,Hooks-based components are standard,Functional components with hooks,Class components,const App = () => { },class App extends Component,Medium,https://reactnative.dev/docs/intro-react
2,Components,Keep components small,Single responsibility principle,Split into smaller components,Large monolithic components,<Header /><Content /><Footer />,500+ line component,Medium,
3,Components,Use TypeScript,Type safety for props and state,TypeScript for new projects,JavaScript without types,const Button: FC<Props> = () => { },const Button = (props) => { },Medium,
4,Components,Colocate component files,Keep related files together,Component folder with styles,Flat structure,components/Button/index.tsx styles.ts,components/Button.tsx styles/button.ts,Low,
5,Styling,Use StyleSheet.create,Optimized style objects,StyleSheet for all styles,Inline style objects,StyleSheet.create({ container: {} }),style={{ margin: 10 }},High,https://reactnative.dev/docs/stylesheet
6,Styling,Avoid inline styles,Prevent object recreation,Styles in StyleSheet,Inline style objects in render,style={styles.container},"style={{ margin: 10, padding: 5 }}",Medium,
7,Styling,Use flexbox for layout,React Native uses flexbox,flexDirection alignItems justifyContent,Absolute positioning everywhere,flexDirection: 'row',position: 'absolute' everywhere,Medium,https://reactnative.dev/docs/flexbox
8,Styling,Handle platform differences,Platform-specific styles,Platform.select or .ios/.android files,Same styles for both platforms,"Platform.select({ ios: {}, android: {} })",Hardcoded iOS values,Medium,https://reactnative.dev/docs/platform-specific-code
9,Styling,Use responsive dimensions,Scale for different screens,Dimensions or useWindowDimensions,Fixed pixel values,useWindowDimensions(),width: 375,Medium,
10,Navigation,Use React Navigation,Standard navigation library,React Navigation for routing,Manual navigation management,createStackNavigator(),Custom navigation state,Medium,https://reactnavigation.org/
11,Navigation,Type navigation params,Type-safe navigation,Typed navigation props,Untyped navigation,"navigation.navigate<RootStackParamList>('Home', { id })","navigation.navigate('Home', { id })",Medium,
12,Navigation,Use deep linking,Support URL-based navigation,Configure linking prop,No deep link support,linking: { prefixes: [] },No linking configuration,Medium,https://reactnavigation.org/docs/deep-linking/
13,Navigation,Handle back button,Android back button handling,useFocusEffect with BackHandler,Ignore back button,BackHandler.addEventListener,No back handler,High,
14,State,Use useState for local state,Simple component state,useState for UI state,Class component state,"const [count, setCount] = useState(0)",this.state = { count: 0 },Medium,
15,State,Use useReducer for complex state,Complex state logic,useReducer for related state,Multiple useState for related values,useReducer(reducer initialState),5+ useState calls,Medium,
16,State,Use context sparingly,Context for global state,Context for theme auth locale,Context for frequently changing data,ThemeContext for app theme,Context for list item data,Medium,
17,State,Consider Zustand or Redux,External state management,Zustand for simple Redux for complex,useState for global state,create((set) => ({ })),Prop drilling global state,Medium,
18,Lists,Use FlatList for long lists,Virtualized list rendering,FlatList for 50+ items,ScrollView with map,<FlatList data={items} />,<ScrollView>{items.map()}</ScrollView>,High,https://reactnative.dev/docs/flatlist
19,Lists,Provide keyExtractor,Unique keys for list items,keyExtractor with stable ID,Index as key,keyExtractor={(item) => item.id},"keyExtractor={(_, index) => index}",High,
20,Lists,Optimize renderItem,Memoize list item components,React.memo for list items,Inline render function,renderItem={({ item }) => <MemoizedItem item={item} />},renderItem={({ item }) => <View>...</View>},High,
21,Lists,Use getItemLayout for fixed height,Skip measurement for performance,getItemLayout when height known,Dynamic measurement for fixed items,"getItemLayout={(_, index) => ({ length: 50, offset: 50 * index, index })}",No getItemLayout for fixed height,Medium,
22,Lists,Implement windowSize,Control render window,Smaller windowSize for memory,Default windowSize for large lists,windowSize={5},windowSize={21} for huge lists,Medium,
23,Performance,Use React.memo,Prevent unnecessary re-renders,memo for pure components,No memoization,export default memo(MyComponent),export default MyComponent,Medium,
24,Performance,Use useCallback for handlers,Stable function references,useCallback for props,New function on every render,"useCallback(() => {}, [deps])",() => handlePress(),Medium,
25,Performance,Use useMemo for expensive ops,Cache expensive calculations,useMemo for heavy computations,Recalculate every render,"useMemo(() => expensive(), [deps])",const result = expensive(),Medium,
26,Performance,Avoid anonymous functions in JSX,Prevent re-renders,Named handlers or useCallback,Inline arrow functions,onPress={handlePress},onPress={() => doSomething()},Medium,
27,Performance,Use Hermes engine,Improved startup and memory,Enable Hermes in build,JavaScriptCore for new projects,hermes_enabled: true,hermes_enabled: false,Medium,https://reactnative.dev/docs/hermes
28,Images,Use expo-image,Modern performant image component for React Native,"Use expo-image for caching, blurring, and performance",Use default Image for heavy lists or unmaintained libraries,<Image source={url} cachePolicy='memory-disk' /> (expo-image),<FastImage source={url} />,Medium,https://docs.expo.dev/versions/latest/sdk/image/
29,Images,Specify image dimensions,Prevent layout shifts,width and height for remote images,No dimensions for network images,<Image style={{ width: 100 height: 100 }} />,<Image source={{ uri }} /> no size,High,
30,Images,Use resizeMode,Control image scaling,resizeMode cover contain,Stretch images,"resizeMode=""cover""",No resizeMode,Low,
31,Forms,Use controlled inputs,State-controlled form fields,value + onChangeText,Uncontrolled inputs,<TextInput value={text} onChangeText={setText} />,<TextInput defaultValue={text} />,Medium,
32,Forms,Handle keyboard,Manage keyboard visibility,KeyboardAvoidingView,Content hidden by keyboard,"<KeyboardAvoidingView behavior=""padding"">",No keyboard handling,High,https://reactnative.dev/docs/keyboardavoidingview
33,Forms,Use proper keyboard types,Appropriate keyboard for input,keyboardType for input type,Default keyboard for all,"keyboardType=""email-address""","keyboardType=""default"" for email",Low,
34,Touch,Use Pressable,Modern touch handling,Pressable for touch interactions,TouchableOpacity for new code,<Pressable onPress={} />,<TouchableOpacity onPress={} />,Low,https://reactnative.dev/docs/pressable
35,Touch,Provide touch feedback,Visual feedback on press,Ripple or opacity change,No feedback on press,android_ripple={{ color: 'gray' }},No press feedback,Medium,
36,Touch,Set hitSlop for small targets,Increase touch area,hitSlop for icons and small buttons,Tiny touch targets,hitSlop={{ top: 10 bottom: 10 }},44x44 with no hitSlop,Medium,
37,Animation,Use Reanimated,High-performance animations,react-native-reanimated,Animated API for complex,useSharedValue useAnimatedStyle,Animated.timing for gesture,Medium,https://docs.swmansion.com/react-native-reanimated/
38,Animation,Run on UI thread,worklets for smooth animation,Run animations on UI thread,JS thread animations,runOnUI(() => {}),Animated on JS thread,High,
39,Animation,Use gesture handler,Native gesture recognition,react-native-gesture-handler,JS-based gesture handling,<GestureDetector>,<View onTouchMove={} />,Medium,https://docs.swmansion.com/react-native-gesture-handler/
40,Async,Handle loading states,Show loading indicators,ActivityIndicator during load,Empty screen during load,{isLoading ? <ActivityIndicator /> : <Content />},No loading state,Medium,
41,Async,Handle errors gracefully,Error boundaries and fallbacks,Error UI for failed requests,Crash on error,{error ? <ErrorView /> : <Content />},No error handling,High,
42,Async,Cancel async operations,Cleanup on unmount,AbortController or cleanup,Memory leaks from async,useEffect cleanup,No cleanup for subscriptions,High,
43,Accessibility,Add accessibility labels,Describe UI elements,accessibilityLabel for all interactive,Missing labels,"accessibilityLabel=""Submit form""",<Pressable> without label,High,https://reactnative.dev/docs/accessibility
44,Accessibility,Use accessibility roles,Semantic meaning,accessibilityRole for elements,Wrong roles,"accessibilityRole=""button""",No role for button,Medium,
45,Accessibility,Support screen readers,Test with TalkBack/VoiceOver,Test with screen readers,Skip accessibility testing,Regular TalkBack testing,No screen reader testing,High,
46,Testing,Use React Native Testing Library,Component testing,render and fireEvent,Enzyme or manual testing,render(<Component />),shallow(<Component />),Medium,https://callstack.github.io/react-native-testing-library/
47,Testing,Test on real devices,Real device behavior,Test on iOS and Android devices,Simulator only,Device testing in CI,Simulator only testing,High,
48,Testing,Use Detox for E2E,End-to-end testing,Detox for critical flows,Manual E2E testing,detox test,Manual testing only,Medium,https://wix.github.io/Detox/
49,Native,Use native modules carefully,Bridge has overhead,Batch native calls,Frequent bridge crossing,Batch updates,Call native on every keystroke,High,
50,Native,Use Expo when possible,Simplified development,Expo for standard features,Bare RN for simple apps,expo install package,react-native link package,Low,https://docs.expo.dev/
51,Native,Handle permissions,Request permissions properly,Check and request permissions,Assume permissions granted,PermissionsAndroid.request(),Access without permission check,High,https://reactnative.dev/docs/permissionsandroid
