react-19

You no longer need manual memoization with useMemo or useCallback in React 19. The React Compiler automatically handles these optimizations, allowing you to write components that filter and sort data without manual performance tuning.

The React Compiler automatically optimizes component rendering by analyzing your code and applying memoization internally. This eliminates the need for manual memoization hooks like useMemo and useCallback while maintaining optimal render performance.

The use hook in React 19 allows you to read promises and context conditionally within your components. You can call it inside conditional blocks or loops, unlike traditional hooks, to unwrap promises and access context values.

Yes, in React 19 you can use ref directly as a prop, removing the need for forwardRef. This simplifies component APIs by allowing parent components to pass refs down without wrapping child components in forwardRef.

Implement Server Components by default in React 19, using Client Components only when necessary. Use Actions with useActionState to manage server-side mutations and pending state, providing a streamlined approach to data fetching and updates.

Use Client Components in React 19 only when you need interactivity, state, or browser APIs. Default to Server Components for data fetching and static rendering, adding Client Components selectively for interactive logic.