Cheat Sheet
| Question | Core Idea | Senior Signal |
|---|---|---|
| Q156 | Memo tools | React.memo skips by shallow props; useMemo caches values; useCallback caches function references. |
| Q157 | Identity | New object and function references can retrigger memoized children and effects. |
| Q158 | Refs | Ref mutation persists without re-rendering; state is for visual data. |
| Q159-Q160 | State patterns | Reducers clarify transitions; custom hooks extract reusable stateful logic. |