React Native Development Rules

- `FlatList` for any list over 10 items — `ScrollView` with `map` loads everything in memory, FlatList virtualizes - `keyExtractor` must return stable unique strings — using index causes bugs on reorder and deletion - `React.memo` prevents re-renders when props unchanged — wrap pure display components - `useCallback` for functions passed to child components — new function reference triggers child re-render - Avoid inline styles in render — creates new object every render, extract to `StyleSheet.