🚀 React Performance & Patterns
Master React.memo, code splitting, HOC, render props, error boundaries, and Server Components
React.memo, optimization, code splitting, HOC, render props, and patterns
React.memo is a higher-order component that memoizes functional components, preventing unnecessary re-renders when props haven't changed.
Suspense lets components wait for something before rendering. Combined with React.lazy(), it enables code splitting to reduce initial bundle size.
React Server Components (RSC) render on the server and send HTML to the client with zero JavaScript. They can directly access databases and reduce client bundle size.
Error Boundaries are React components that catch JavaScript errors in their child component tree, log errors, and display fallback UI instead of crashing the entire app.
HOCs and render props are patterns for code reuse in React. HOCs wrap components to add functionality, while render props share code via a function prop.
React performance optimization involves reducing unnecessary renders, optimizing bundle size, and improving perceived performance through various techniques.
Infinite scrolling loads more content as the user scrolls near the bottom. It can be implemented using Intersection Observer or scroll event listeners.
Performance & Patterns Interview Tips
- ✓ Know when and when not to use React.memo
- ✓ Understand code splitting with React.lazy and Suspense
- ✓ Be familiar with Error Boundary implementation
- ✓ Know the trade-offs between HOC, render props, and custom hooks
- ✓ Understand React Server Components vs Client Components
- ✓ Be able to identify and fix common performance bottlenecks
- ✓ Know virtualization techniques for large lists
- ✓ Understand context optimization strategies