Memoization

Summary

Caching the result of an expensive computation or a component's render output (`useMemo`, `useCallback`, `React.memo`) so it isn't recalculated unnecessarily.

How to Learn This

1Wrap an expensive calculation in `useMemo` and confirm it skips recomputation.
2Use `React.memo` on a child component to prevent unnecessary re-renders.
3Learn that premature memoization can hurt more than help — profile first.

Refs

Error Boundaries

More topics in React

JSX Components Props State Lifecycle Hooks Context API React Router Forms Controlled Components Refs Error Boundaries Lazy Loading Suspense Portals Custom Hooks Render Props HOC React Patterns

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