React Expert

Server Components in React 18+ reduce client-side JavaScript and improve performance by rendering content on the server. Use them for data fetching and static content, pair with Client Components for interactivity, and leverage Suspense boundaries to manage loading states efficiently.

Modern React state management uses Context for simple cases, or libraries like Zustand and Redux Toolkit for complex applications. Choose based on scale: Context for local state, Zustand for lightweight global state, Redux Toolkit for enterprise patterns with predictable data flow.

Memoization prevents unnecessary re-renders of components and expensive computations. Combine with lazy loading and code splitting to defer large bundle chunks, and use virtualization for long lists. These techniques reduce initial load time and improve runtime responsiveness.

The use() hook in React 19 unwraps promises and integrates seamlessly with Server Components and Suspense boundaries. It simplifies async data handling in components, allowing you to await promises directly while maintaining clean separation between server and client logic.

Use semantic HTML elements, add ARIA attributes for dynamic content, implement error boundaries for graceful failures, and test with assistive technologies. React applications require explicit focus management and keyboard navigation to meet accessibility standards.

Enforce strict TypeScript in React projects to catch errors at compile time. Type component props, state, and hooks; use discriminated unions for complex state shapes; and validate data fetching responses. Strict mode prevents runtime type-related bugs in production.