React hook
A React Hook is a function-based API that enables function components to access state, effects, context, and other React capabilities.
React Hooks in Action: With Suspense and Concurrent Mode
React Hooks are functions that let React function components access state, lifecycle behavior, and other React capabilities.
- How it is used
- Uses functions to add state, lifecycle access, context, side effects, and reusable behavior to React components.
- How deep it goes
- Explains rendering updates, side-effect organization, custom-hook extraction, and call-order restrictions, without detailing React internals.
- Examples
- Demonstrates Quiz, Chat, BookablesList, data fetching, user subscriptions, React Router, Redux, and React Spring integrations.
- What you can do after
- Apply React Hooks to build stateful function components, organize effects, extract custom hooks, and reuse behavior across components.
Read how React Hooks in Action: With Suspense and Concurrent Mode explains React hook →
React Quickly, Second Edition
React Hooks are functions that let functional components access React features such as state and lifecycle-related behavior.
- How it is used
- Makes functional components stateful and connects them to effects, context, and other React features.
- How deep it goes
- Defines hooks, groups their purposes, and works through call-order rules while flagging library hooks as advanced.
- Examples
- Uses visibility state, an early-return counter, and a custom hook for repeated context access.
- What you can do after
- Apply it via React’s useState and useContext, and place hook calls consistently across renders.
Read how React Quickly, Second Edition explains React hook →
Build Financial Software with Generative AI (From Scratch)
A React hook is a function-based API for managing component state and lifecycle behavior.
- How it is used
- Organizes component state and lifecycle behavior within React UI development.
- How deep it goes
- Defines hooks at a conceptual level but stops short of individual APIs, implementation details, or worked hook code.
- Examples
- Uses a Next.js dashboard setup as surrounding context without showing a hook-specific implementation.
- What you can do after
- Evaluate and understand the basic role of hooks in React components.
Read how Build Financial Software with Generative AI (From Scratch) explains React hook →
Related concepts
- useStateincludes · useState is a React Hook that provides a function component with a state value and a function for updating it.
- custom hookused by · A custom hook is a developer-defined JavaScript function that composes React Hooks to encapsulate reusable stateful or effectful component logic.
- useMemoincludes · useMemo is a React Hook that caches a calculated value between renders and recomputes it when specified dependencies change.
- useReducerincludes · useReducer is a React Hook that manages component state by applying a reducer function to the current state and dispatched actions.
- early returncontrasts with · An early return is a control-flow technique in which a function exits before reaching its normal completion point.
- stateuses · State is information or a configuration describing the condition of a system, entity, or computation at a particular time and potentially influencing subsequent behavior or decisions.
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