1 RN Thing a Day – Day 12: useEffect vs useFocusEffect

useEffect React to data changes only useEffect (() => { // logic }, [ dep ]) ✅ Runs when: The component mounts The dependency (dep) changes ❌ Does NOT run when: The screen is revisited (focused again) Navigation happens without changing the dependency useFocusEffect useFocusEffect ( useCallback (() => { // logic }, [ dep ]) ) ✅ Runs when: The screen becomes focused (opened or revisited) The dependency changes while the screen is focused Even if dep did NOT change → it still runs on screen focus