In React, a hook is a function that allows you to “hook into” React features. Hooks are a way to use state and other React features without writing a class.
There are several built-in hooks in React, including:
Here is a list of all the built-in hooks in React:
useState: This hook allows you to add state to functional components. It returns an array with two elements: the current state value and a function to update it.
useEffect: This hook allows you to perform side effects in functional components. It is called after the component renders and can be used to fetch data, perform updates, and more.
useContext: This hook allows you to access the context object from a functional component. The context object is created using the
useReducer: This hook is similar to
useState, but it allows you to use a reducer function to update the state. It is useful for managing complex state updates.
useCallback: This hook returns a memoized callback function. It is useful for optimizing performance by avoiding unnecessary re-renders.
useMemo: This hook returns a memoized value. It is useful for optimizing performance by avoiding unnecessary re-computations.
useRef: This hook creates a mutable ref object. It is useful for accessing DOM elements or for storing values that don’t need to trigger a re-render when they change.
useImperativeHandle: This hook allows you to customize the instance value that is exposed to parent components when using
ref. It is useful for implementing advanced patterns like exposing imperative input focus to parent components.
useLayoutEffect: This hook is similar to
useEffect, but it fires synchronously after all DOM mutations. It is useful for performing DOM mutations that need to happen before the browser paints.
useDebugValue: This hook can be used to display a label for a custom hook in the React DevTools. It is useful for debugging and for providing a better developer experience.
You can also create your own custom hooks to share logic between components. Custom hooks are simply functions that follow a certain naming convention and can call other hooks.