Hooks are a new addition to ReactJS that allow developers to use state and other React features without writing a class. They were introduced in React 16.8 and have since become an integral part of the ReactJS ecosystem.
Some of the key benefits of Hooks include:
- Reusing stateful logic between components
- Improving code readability and maintainability
- Simplifying the way side effects are handled in functional components
- Making it easier to test components
There are several built-in Hooks in ReactJS, including:
- useState: This Hook allows functional components to manage state by providing a state variable and a function to update it.
- useEffect: This Hook allows functional components to handle side effects by running a function after every render cycle.
- useContext: This Hook allows functional components to consume a Context value.
- useReducer: This Hook allows for more complex state management in functional components by using a reducer function.
- useCallback: This Hook allows for memoization of functions to prevent unnecessary re-renders.
- useMemo: This Hook allows for memoization of expensive computations to prevent unnecessary re-computations.
- useRef: This Hook allows for creating a mutable reference to a DOM node or a value that persists across render cycles.
Hooks have significantly improved the way developers write ReactJS applications by providing a more flexible and powerful way to handle state and side effects.