React Hooks

Learn React Hooks with 11 examples, including useState and useEffect. Discover how to store values, trigger re-renders, and manage side effects.

Extract reusable stateful logic into custom React Hooks, functions starting with use. Learn to compose hooks like useState and useEffect.

Learn how to use the useEffect hook in React to synchronize components with external systems, manage side effects, and perform cleanup.

Learn to manage local component state in React using the useState hook. Explore its API, working examples, and how it triggers component re-renders.

Learn how to use the useContext React Hook to share values like themes or authentication across components without prop drilling.

Learn to manage complex state with the useReducer hook. Understand how to use a reducer function and dispatch actions for predictable state transitions.

Learn how to use the useMemo hook to cache expensive computation results and stabilize object/array references in React components.

Learn how to use the useCallback hook in React to cache function definitions, stabilize callbacks, and optimize performance in your components.

Learn how to use the useRef hook to manage mutable values, access DOM elements, and store previous state without triggering component re-renders.

Learn how to use the useId React hook to generate unique, stable IDs for accessibility attributes like htmlFor and aria-labelledby.

Optimize UI responsiveness during expensive state updates using the useTransition hook. Learn to mark updates as non-urgent to prevent blocking user input.

Learn how to use the useDeferredValue Hook to defer UI updates, keeping input responsive during expensive child component renders.

Learn to manage form state with the useActionState hook, including pending indicators, results, and progressive enhancement for server actions.

Instantly update UI with useOptimistic while an async action processes. Learn to implement optimistic updates for messages, likes, and more.

Read the value of a promise or context during render - React 19's new primitive for async data and conditional context.

Learn 25 essential React Hooks best practices, including naming custom hooks, returning tuples with as const, and using useActionState effectively.

A single-page roundup of every highlight bullet from the 16 pages in the React Hooks section, grouped by source page so you can scan all 96 takeaways without opening each article individually.