Advanced Topics

Explore advanced React Native concepts, patterns, and techniques for building sophisticated mobile applications.

Overview

This guide covers advanced React Native development topics that go beyond the fundamentals. These concepts are essential for building complex, production-ready applications with custom native functionality.

Table of Contents

1. Custom Native Modules
2. Bridge Communication
3. Native UI Components
4. Advanced Styling
5. Custom Hooks & Patterns
6. Memory Management
7. Advanced Navigation
8. Microinteractions
9. Code Splitting
10. Advanced Debugging

Custom Native Modules

Creating iOS Native Modules

// ios/YourApp/CustomModule.swift
import Foundation
import React

@objc(CustomModule)
class CustomModule: NSObject {

  @objc
  static func requiresMainQueueSetup() -> Bool {
    return false
  }

  @objc
  func getBatteryLevel(_ resolve: @escaping RCTPromiseResolveBlock,
                      rejecter reject: @escaping RCTPromiseRejectBlock) {
    UIDevice.current.isBatteryMonitoringEnabled = true
    let batteryLevel = UIDevice.current.batteryLevel

    if batteryLevel < 0 {
      reject("BATTERY_ERROR", "Unable to get battery level", nil)
    } else {
      resolve(batteryLevel * 100)
    }
  }

  @objc
  func showAlert(_ title: String, message: String) {
    DispatchQueue.main.async {
      let alert = UIAlertController(title: title, message: message, preferredStyle: .alert)
      alert.addAction(UIAlertAction(title: "OK", style: .default))

      if let rootViewController = UIApplication.shared.windows.first?.rootViewController {
        rootViewController.present(alert, animated: true)
      }
    }
  }
}

// ios/YourApp/CustomModule.m
#import <React/RCTBridgeModule.h>

@interface RCT_EXTERN_MODULE(CustomModule, NSObject)
RCT_EXTERN_METHOD(getBatteryLevel:(RCTPromiseResolveBlock)resolve
                  rejecter:(RCTPromiseRejectBlock)reject)
RCT_EXTERN_METHOD(showAlert:(NSString *)title message:(NSString *)message)
@end

Creating Android Native Modules

// android/app/src/main/java/com/yourapp/CustomModule.java
package com.yourapp;

import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import android.widget.Toast;

import com.facebook.react.bridge.Promise;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.bridge.ReactContextBaseJavaModule;
import com.facebook.react.bridge.ReactMethod;

public class CustomModule extends ReactContextBaseJavaModule {
    private static ReactApplicationContext reactContext;

    CustomModule(ReactApplicationContext context) {
        super(context);
        reactContext = context;
    }

    @Override
    public String getName() {
        return "CustomModule";
    }

    @ReactMethod
    public void getBatteryLevel(Promise promise) {
        try {
            Intent batteryIntent = reactContext.registerReceiver(null,
                new IntentFilter(Intent.ACTION_BATTERY_CHANGED));

            int level = batteryIntent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1);
            int scale = batteryIntent.getIntExtra(BatteryManager.EXTRA_SCALE, -1);

            float batteryLevel = level * 100 / (float) scale;
            promise.resolve(batteryLevel);
        } catch (Exception e) {
            promise.reject("BATTERY_ERROR", "Unable to get battery level", e);
        }
    }

    @ReactMethod
    public void showToast(String message) {
        Toast.makeText(getReactApplicationContext(), message, Toast.LENGTH_SHORT).show();
    }
}

// android/app/src/main/java/com/yourapp/CustomModulePackage.java
package com.yourapp;

import com.facebook.react.ReactPackage;
import com.facebook.react.bridge.NativeModule;
import com.facebook.react.bridge.ReactApplicationContext;
import com.facebook.react.uimanager.ViewManager;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

public class CustomModulePackage implements ReactPackage {
    @Override
    public List<ViewManager> createViewManagers(ReactApplicationContext reactContext) {
        return Collections.emptyList();
    }

    @Override
    public List<NativeModule> createNativeModules(ReactApplicationContext reactContext) {
        List<NativeModule> modules = new ArrayList<>();
        modules.add(new CustomModule(reactContext));
        return modules;
    }
}

TypeScript Integration

// src/modules/CustomModule.ts
import { NativeModules } from "react-native"

interface CustomModuleInterface {
  getBatteryLevel(): Promise<number>
  showAlert(title: string, message: string): void
  showToast(message: string): void
}

const { CustomModule } = NativeModules

export default CustomModule as CustomModuleInterface

// Usage
import CustomModule from "@/modules/CustomModule"

const useBattery = () => {
  const [batteryLevel, setBatteryLevel] = useState<number>(0)

  const checkBatteryLevel = async () => {
    try {
      const level = await CustomModule.getBatteryLevel()
      setBatteryLevel(level)
    } catch (error) {
      console.error("Failed to get battery level:", error)
    }
  }

  return { batteryLevel, checkBatteryLevel }
}

Bridge Communication

Event Emitters

// Native module with event emitter
import { NativeEventEmitter, NativeModules } from "react-native"

const { LocationModule } = NativeModules
const locationEmitter = new NativeEventEmitter(LocationModule)

const useLocationUpdates = () => {
  const [location, setLocation] = useState<Location | null>(null)

  useEffect(() => {
    const subscription = locationEmitter.addListener("LocationUpdate", (newLocation: Location) => {
      setLocation(newLocation)
    })

    // Start location updates
    LocationModule.startLocationUpdates()

    return () => {
      subscription.remove()
      LocationModule.stopLocationUpdates()
    }
  }, [])

  return location
}

Advanced Bridge Patterns

// Batch operations for performance
const BatchedNativeModule = {
  operations: [] as Array<() => Promise<any>>,

  addOperation<T>(operation: () => Promise<T>): Promise<T> {
    return new Promise((resolve, reject) => {
      this.operations.push(async () => {
        try {
          const result = await operation()
          resolve(result)
        } catch (error) {
          reject(error)
        }
      })
    })
  },

  async executeBatch() {
    const results = await Promise.allSettled(this.operations.map((op) => op()))
    this.operations = []
    return results
  },
}

// Usage
const performBatchOperations = async () => {
  BatchedNativeModule.addOperation(() => CustomModule.getBatteryLevel())

  BatchedNativeModule.addOperation(() => CustomModule.getDeviceInfo())

  const results = await BatchedNativeModule.executeBatch()
  return results
}

Native UI Components

Creating Custom Views (iOS)

// ios/YourApp/CustomView.swift
import UIKit
import React

class CustomView: UIView {
  @objc var onPress: RCTDirectEventBlock?
  @objc var title: String = "" {
    didSet {
      titleLabel.text = title
    }
  }

  private let titleLabel = UILabel()
  private let button = UIButton(type: .system)

  override init(frame: CGRect) {
    super.init(frame: frame)
    setupView()
  }

  required init?(coder: NSCoder) {
    super.init(coder: coder)
    setupView()
  }

  private func setupView() {
    addSubview(titleLabel)
    addSubview(button)

    button.setTitle("Press Me", for: .normal)
    button.addTarget(self, action: #selector(buttonPressed), for: .touchUpInside)

    // Auto Layout setup
    titleLabel.translatesAutoresizingMaskIntoConstraints = false
    button.translatesAutoresizingMaskIntoConstraints = false

    NSLayoutConstraint.activate([
      titleLabel.topAnchor.constraint(equalTo: topAnchor),
      titleLabel.leadingAnchor.constraint(equalTo: leadingAnchor),
      titleLabel.trailingAnchor.constraint(equalTo: trailingAnchor),

      button.topAnchor.constraint(equalTo: titleLabel.bottomAnchor, constant: 8),
      button.centerXAnchor.constraint(equalTo: centerXAnchor),
      button.bottomAnchor.constraint(equalTo: bottomAnchor)
    ])
  }

  @objc private func buttonPressed() {
    onPress?(["message": "Button was pressed!"])
  }
}

// CustomViewManager.swift
import React

@objc(CustomViewManager)
class CustomViewManager: RCTViewManager {
  override func view() -> UIView! {
    return CustomView()
  }

  override static func requiresMainQueueSetup() -> Bool {
    return true
  }
}

React Native Component Interface

// src/components/CustomView.tsx
import React from "react"
import { requireNativeComponent, ViewStyle, NativeSyntheticEvent } from "react-native"

interface CustomViewProps {
  style?: ViewStyle
  title: string
  onPress?: (event: NativeSyntheticEvent<{ message: string }>) => void
}

const NativeCustomView = requireNativeComponent<CustomViewProps>("CustomView")

export const CustomView: React.FC<CustomViewProps> = (props) => {
  return <NativeCustomView {...props} />
}

// Usage
const App = () => {
  const handlePress = (event: NativeSyntheticEvent<{ message: string }>) => {
    console.log("Native view pressed:", event.nativeEvent.message)
  }

  return <CustomView title="My Custom Component" onPress={handlePress} style={{ height: 100, margin: 20 }} />
}

Advanced Styling

Dynamic Styling System

// Advanced theming system
interface Theme {
  colors: {
    primary: string
    secondary: string
    background: string
    surface: string
    text: string
    error: string
  }
  spacing: {
    xs: number
    sm: number
    md: number
    lg: number
    xl: number
  }
  typography: {
    heading: TextStyle
    body: TextStyle
    caption: TextStyle
  }
}

const createTheme = (baseTheme: Partial<Theme>): Theme => {
  return {
    colors: {
      primary: "#007AFF",
      secondary: "#5856D6",
      background: "#FFFFFF",
      surface: "#F2F2F7",
      text: "#000000",
      error: "#FF3B30",
      ...baseTheme.colors,
    },
    spacing: {
      xs: 4,
      sm: 8,
      md: 16,
      lg: 24,
      xl: 32,
      ...baseTheme.spacing,
    },
    typography: {
      heading: {
        fontSize: 24,
        fontWeight: "600",
        lineHeight: 32,
      },
      body: {
        fontSize: 16,
        fontWeight: "400",
        lineHeight: 24,
      },
      caption: {
        fontSize: 12,
        fontWeight: "400",
        lineHeight: 16,
      },
      ...baseTheme.typography,
    },
  }
}

// Responsive styling
const useResponsiveStyle = () => {
  const { width, height } = useWindowDimensions()

  const isTablet = width >= 768
  const isLandscape = width > height

  const responsiveStyle = useMemo(() => {
    return StyleSheet.create({
      container: {
        padding: isTablet ? 24 : 16,
        flexDirection: isTablet && isLandscape ? "row" : "column",
      },
      content: {
        flex: 1,
        marginHorizontal: isTablet ? 16 : 0,
      },
    })
  }, [isTablet, isLandscape])

  return responsiveStyle
}

Animation-Based Styling

// Advanced animation patterns
const useAnimatedStyle = () => {
  const scale = useSharedValue(1)
  const opacity = useSharedValue(1)
  const translateY = useSharedValue(0)

  const animatedStyle = useAnimatedStyle(() => {
    return {
      transform: [{ scale: scale.value }, { translateY: translateY.value }],
      opacity: opacity.value,
    }
  })

  const animate = {
    press: () => {
      scale.value = withSpring(0.95)
    },
    release: () => {
      scale.value = withSpring(1)
    },
    slideIn: () => {
      translateY.value = withTiming(0, { duration: 300 })
      opacity.value = withTiming(1, { duration: 300 })
    },
    slideOut: () => {
      translateY.value = withTiming(-50, { duration: 300 })
      opacity.value = withTiming(0, { duration: 300 })
    },
  }

  return { animatedStyle, animate }
}

Custom Hooks & Patterns

Advanced State Management Hooks

// Complex async state hook
interface AsyncState<T> {
  data: T | null
  loading: boolean
  error: Error | null
  refetch: () => Promise<void>
}

const useAsyncResource = <T>(fetchFn: () => Promise<T>, dependencies: any[] = []): AsyncState<T> => {
  const [state, setState] = useState<AsyncState<T>>({
    data: null,
    loading: true,
    error: null,
    refetch: async () => {},
  })

  const fetchData = useCallback(async () => {
    setState((prev) => ({ ...prev, loading: true, error: null }))

    try {
      const data = await fetchFn()
      setState((prev) => ({ ...prev, data, loading: false }))
    } catch (error) {
      setState((prev) => ({
        ...prev,
        error: error as Error,
        loading: false,
      }))
    }
  }, dependencies)

  useEffect(() => {
    fetchData()
  }, [fetchData])

  const refetch = useCallback(async () => {
    await fetchData()
  }, [fetchData])

  return { ...state, refetch }
}

// Intersection observer hook for virtualization
const useIntersectionObserver = (threshold = 0.1): [React.RefObject<View>, boolean] => {
  const ref = useRef<View>(null)
  const [isIntersecting, setIsIntersecting] = useState(false)

  useEffect(() => {
    const observer = new IntersectionObserver(
      ([entry]) => {
        setIsIntersecting(entry.isIntersecting)
      },
      { threshold }
    )

    if (ref.current) {
      observer.observe(ref.current as any)
    }

    return () => observer.disconnect()
  }, [threshold])

  return [ref, isIntersecting]
}

Advanced Component Patterns

// Compound component pattern
interface TabsProps {
  children: React.ReactNode
  defaultValue?: string
  onValueChange?: (value: string) => void
}

interface TabsContextType {
  activeTab: string
  setActiveTab: (tab: string) => void
}

const TabsContext = createContext<TabsContextType | undefined>(undefined)

const Tabs: React.FC<TabsProps> & {
  List: typeof TabsList
  Trigger: typeof TabsTrigger
  Content: typeof TabsContent
} = ({ children, defaultValue = "", onValueChange }) => {
  const [activeTab, setActiveTab] = useState(defaultValue)

  const handleTabChange = useCallback(
    (tab: string) => {
      setActiveTab(tab)
      onValueChange?.(tab)
    },
    [onValueChange]
  )

  return <TabsContext.Provider value={{ activeTab, setActiveTab: handleTabChange }}>{children}</TabsContext.Provider>
}

const TabsList: React.FC<{ children: React.ReactNode }> = ({ children }) => {
  return <View style={styles.tabsList}>{children}</View>
}

const TabsTrigger: React.FC<{
  value: string
  children: React.ReactNode
}> = ({ value, children }) => {
  const context = useContext(TabsContext)
  if (!context) throw new Error("TabsTrigger must be used within Tabs")

  const { activeTab, setActiveTab } = context
  const isActive = activeTab === value

  return (
    <TouchableOpacity
      style={[styles.tabTrigger, isActive && styles.tabTriggerActive]}
      onPress={() => setActiveTab(value)}
    >
      {children}
    </TouchableOpacity>
  )
}

const TabsContent: React.FC<{
  value: string
  children: React.ReactNode
}> = ({ value, children }) => {
  const context = useContext(TabsContext)
  if (!context) throw new Error("TabsContent must be used within Tabs")

  const { activeTab } = context

  if (activeTab !== value) return null

  return <View style={styles.tabContent}>{children}</View>
}

Tabs.List = TabsList
Tabs.Trigger = TabsTrigger
Tabs.Content = TabsContent

Memory Management

Optimizing Re-renders

// Advanced memoization patterns
const ExpensiveComponent = React.memo<{
  data: ComplexData[]
  onItemPress: (id: string) => void
}>(
  ({ data, onItemPress }) => {
    // Memoize expensive calculations
    const processedData = useMemo(() => {
      return data.map((item) => ({
        ...item,
        processed: expensiveProcessing(item),
      }))
    }, [data])

    // Stable callback references
    const handleItemPress = useCallback(
      (id: string) => {
        onItemPress(id)
      },
      [onItemPress]
    )

    return (
      <FlatList
        data={processedData}
        renderItem={({ item }) => <MemoizedItem item={item} onPress={handleItemPress} />}
        keyExtractor={(item) => item.id}
        getItemLayout={(data, index) => ({
          length: ITEM_HEIGHT,
          offset: ITEM_HEIGHT * index,
          index,
        })}
        windowSize={10}
        maxToRenderPerBatch={10}
        updateCellsBatchingPeriod={50}
      />
    )
  },
  (prevProps, nextProps) => {
    // Custom comparison for complex props
    return (
      JSON.stringify(prevProps.data) === JSON.stringify(nextProps.data) &&
      prevProps.onItemPress === nextProps.onItemPress
    )
  }
)

// Memory leak prevention
const useMemoryEfficientEffect = (effect: () => (() => void) | void, deps: any[]) => {
  const mountedRef = useRef(true)

  useEffect(() => {
    let cleanup: (() => void) | void

    if (mountedRef.current) {
      cleanup = effect()
    }

    return () => {
      if (typeof cleanup === "function") {
        cleanup()
      }
    }
  }, deps)

  useEffect(() => {
    return () => {
      mountedRef.current = false
    }
  }, [])
}

Advanced Navigation

Complex Navigation Patterns

// Advanced navigation with type safety
type RootStackParamList = {
  Home: undefined
  Profile: { userId: string }
  Settings: { section?: string }
  Modal: { content: string }
}

type TabParamList = {
  HomeTab: NavigatorScreenParams<RootStackParamList>
  SearchTab: undefined
  NotificationsTab: { badge?: number }
}

// Custom navigation hook with state persistence
const useNavigationState = () => {
  const navigation = useNavigation()
  const [navigationHistory, setNavigationHistory] = useState<string[]>([])

  const navigateWithHistory = useCallback(
    (screen: keyof RootStackParamList, params?: any) => {
      setNavigationHistory((prev) => [...prev, screen])
      navigation.navigate(screen as never, params as never)
    },
    [navigation]
  )

  const goBackInHistory = useCallback(() => {
    if (navigationHistory.length > 1) {
      const prevScreen = navigationHistory[navigationHistory.length - 2]
      setNavigationHistory((prev) => prev.slice(0, -1))
      navigation.navigate(prevScreen as never)
    } else {
      navigation.goBack()
    }
  }, [navigation, navigationHistory])

  return { navigateWithHistory, goBackInHistory, navigationHistory }
}

// Deep linking with complex routing
const useDeepLinking = () => {
  const navigation = useNavigation()

  useEffect(() => {
    const handleURL = (url: string) => {
      const route = Linking.parse(url)

      if (route.pathname === "/profile" && route.queryParams?.userId) {
        navigation.navigate("Profile", {
          userId: route.queryParams.userId as string,
        })
      } else if (route.pathname === "/settings") {
        navigation.navigate("Settings", {
          section: route.queryParams?.section as string,
        })
      }
    }

    Linking.getInitialURL().then((url) => {
      if (url) handleURL(url)
    })

    const subscription = Linking.addEventListener("url", ({ url }) => {
      handleURL(url)
    })

    return () => subscription?.remove()
  }, [navigation])
}

Microinteractions

Advanced Gesture Handling

// Complex gesture patterns
const useAdvancedGestures = () => {
  const pan = Gesture.Pan()
    .onStart(() => {
      runOnJS(hapticFeedback)()
    })
    .onUpdate((event) => {
      translateX.value = event.translationX
      translateY.value = event.translationY

      // Dynamic resistance
      const resistance = Math.abs(event.translationX) / 100
      scale.value = Math.max(0.8, 1 - resistance * 0.2)
    })
    .onEnd((event) => {
      const shouldDismiss = Math.abs(event.translationX) > 100 || Math.abs(event.velocityX) > 500

      if (shouldDismiss) {
        translateX.value = withSpring(event.translationX > 0 ? 300 : -300, { velocity: event.velocityX }, () =>
          runOnJS(onDismiss)()
        )
      } else {
        translateX.value = withSpring(0)
        translateY.value = withSpring(0)
        scale.value = withSpring(1)
      }
    })

  const longPress = Gesture.LongPress()
    .minDuration(500)
    .onStart(() => {
      scale.value = withSpring(1.1)
      runOnJS(triggerHaptic)("impactHeavy")
    })
    .onEnd(() => {
      scale.value = withSpring(1)
      runOnJS(showContextMenu)()
    })

  return Gesture.Simultaneous(pan, longPress)
}

// Physics-based animations
const usePhysicsAnimation = () => {
  const position = useSharedValue({ x: 0, y: 0 })
  const velocity = useSharedValue({ x: 0, y: 0 })

  const animateToPosition = (targetX: number, targetY: number) => {
    const distance = Math.sqrt(Math.pow(targetX - position.value.x, 2) + Math.pow(targetY - position.value.y, 2))

    const duration = Math.min(1000, distance * 2)

    position.value = withTiming(
      { x: targetX, y: targetY },
      {
        duration,
        easing: Easing.out(Easing.cubic),
      }
    )
  }

  const addImpulse = (impulseX: number, impulseY: number) => {
    velocity.value = {
      x: velocity.value.x + impulseX,
      y: velocity.value.y + impulseY,
    }

    // Apply physics simulation
    const simulate = () => {
      const friction = 0.95
      velocity.value = {
        x: velocity.value.x * friction,
        y: velocity.value.y * friction,
      }

      position.value = {
        x: position.value.x + velocity.value.x,
        y: position.value.y + velocity.value.y,
      }

      if (Math.abs(velocity.value.x) > 0.1 || Math.abs(velocity.value.y) > 0.1) {
        requestAnimationFrame(simulate)
      }
    }

    simulate()
  }

  return { position, animateToPosition, addImpulse }
}

Code Splitting

Dynamic Imports and Lazy Loading

// Component lazy loading
const LazyScreen = React.lazy(() =>
  import('../screens/ExpensiveScreen').then(module => ({
    default: module.ExpensiveScreen
  }))
);

const LazyScreenWrapper = () => (
  <Suspense fallback={<LoadingSpinner />}>
    <LazyScreen />
  </Suspense>
);

// Bundle splitting with Metro
const useDynamicImport = <T>(importFn: () => Promise<T>) => {
  const [module, setModule] = useState<T | null>(null);
  const [loading, setLoading] = useState(false);
  const [error, setError] = useState<Error | null>(null);

  const load = useCallback(async () => {
    if (module) return module;

    setLoading(true);
    setError(null);

    try {
      const loadedModule = await importFn();
      setModule(loadedModule);
      return loadedModule;
    } catch (err) {
      setError(err as Error);
      throw err;
    } finally {
      setLoading(false);
    }
  }, [importFn, module]);

  return { module, loading, error, load };
};

// Usage
const useAdvancedFeatures = () => {
  const { module: advancedModule, load } = useDynamicImport(() =>
    import('../modules/AdvancedFeatures')
  );

  const enableAdvancedMode = async () => {
    const module = await load();
    module.initialize();
  };

  return { advancedModule, enableAdvancedMode };
};

Advanced Debugging

Performance Profiling

// Custom performance monitor
class PerformanceMonitor {
  private static instance: PerformanceMonitor
  private metrics: Map<string, number[]> = new Map()

  static getInstance() {
    if (!this.instance) {
      this.instance = new PerformanceMonitor()
    }
    return this.instance
  }

  startMeasure(label: string) {
    const start = performance.now()
    return () => {
      const duration = performance.now() - start
      this.addMetric(label, duration)
      return duration
    }
  }

  private addMetric(label: string, value: number) {
    if (!this.metrics.has(label)) {
      this.metrics.set(label, [])
    }
    this.metrics.get(label)!.push(value)
  }

  getAverageTime(label: string): number {
    const values = this.metrics.get(label) || []
    return values.reduce((sum, val) => sum + val, 0) / values.length
  }

  getReport(): Record<string, { avg: number; count: number }> {
    const report: Record<string, { avg: number; count: number }> = {}

    this.metrics.forEach((values, label) => {
      report[label] = {
        avg: this.getAverageTime(label),
        count: values.length,
      }
    })

    return report
  }
}

// Performance monitoring hook
const usePerformanceMonitor = (label: string) => {
  const monitor = PerformanceMonitor.getInstance()

  const measurePerformance = useCallback(
    (fn: () => void | Promise<void>) => {
      const stopMeasure = monitor.startMeasure(label)

      if (fn.constructor.name === "AsyncFunction") {
        return (fn as () => Promise<void>)().finally(stopMeasure)
      } else {
        const result = fn()
        stopMeasure()
        return result
      }
    },
    [label, monitor]
  )

  return measurePerformance
}

// Memory usage tracking
const useMemoryMonitor = () => {
  const [memoryUsage, setMemoryUsage] = useState<{
    used: number
    total: number
  }>({ used: 0, total: 0 })

  useEffect(() => {
    const updateMemoryUsage = () => {
      if ("memory" in performance) {
        const memory = (performance as any).memory
        setMemoryUsage({
          used: memory.usedJSHeapSize / 1024 / 1024, // MB
          total: memory.totalJSHeapSize / 1024 / 1024, // MB
        })
      }
    }

    const interval = setInterval(updateMemoryUsage, 1000)
    updateMemoryUsage()

    return () => clearInterval(interval)
  }, [])

  return memoryUsage
}

Next Steps

After mastering these advanced topics:

• Performance Optimization - Apply advanced optimization techniques
• Deployment & Distribution - Deploy your advanced features
• Testing Strategies - Test complex functionality thoroughly

Resources

• React Native Architecture
• Custom Native Modules
• React Native Performance
• Metro Bundler