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React is more than a UI library. It is a system for managing complexity.
Stop thinking about components. Think about systems.
Ask yourself how a feature behaves across the whole app. This shift separates junior and senior engineers.
State management is a common struggle.
- Use Context API for simple shared state.
- Use Redux Toolkit for complex data.
Redux Toolkit gives you central logic. It makes your app predictable.
Build for reusability.
- One component, one job.
- Use composition. Avoid deep props.
- Separate UI from business logic.
Use custom hooks. They move logic out of your UI. This makes your code clean.
Performance is a requirement.
- Use memoization.
- Use code splitting.
- Use virtualization for long lists.
Most lag comes from unnecessary re-renders.
Plan for failure. Treat error handling as a feature. Use loading skeletons for a better user experience.
Engineering is about trade-offs.
- Context API is simple. It does not scale.
- Redux Toolkit is strong. It adds boilerplate.
- Local state is fast. It stays isolated.
- Global state is flexible. It adds complexity.
React engineering is not about writing UI. It is about designing predictable systems.