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Core Components

View and Text StyleSheet Pressable Image ScrollView FlatList SectionList SafeAreaView

State and Navigation

useState form useEffect subscription useMemo expensive value useCallback handler Context provider React Navigation stack Route params Navigation tabs

Native Interaction

TextInput KeyboardAvoidingView Modal Alert Animated.Value PanResponder AppState Linking

Production

Platform.select PermissionsAndroid AsyncStorage Fetch API AbortController request RefreshControl Accessibility props React Native Testing Library

React Native / State and Navigation

useEffect subscription

Learn useEffect subscription in React Native through a focused explanation, a topic-specific example, an engineering warning, and a mastery check.

12 min read • Intermediate

react-native-010.ts

typescript

useEffect(()=>{ const sub=AppState.addEventListener("change",setState); return ()=>sub.remove(); },[]);

What to watch

Content source & attribution

Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

useEffect subscription Mastery Check →

useMemo expensive value