What is Hooks in React JS | Technical Chamber
In React.js, “hooks” refer to a feature introduced in React version 16.8 that allows you to use state and other React features without writing a class. Prior to hooks, state management and other React features were primarily used within class components. Hooks provide a way to use these features in functional components.
Hooks are functions that let you “hook into” React features like state, context, and lifecycle methods. They allow you to write reusable logic and manage component state without the need for class components.
There are several built-in hooks available in React, including:
Use State: It allows functional components to have state by providing a state variable and a function to update that variable.
Use Effect: It allows performing side effects (such as data fetching, subscriptions, or manual DOM manipulation) in functional components. It replaces lifecycle methods like component DidMount, component DidUpdate, and component Will Unmount.
Use Context: It enables accessing the value of a React context within a functional component.
Use Ref: It creates a mutable ref object that can hold a value across renders. It’s commonly used for accessing DOM elements or storing mutable values.
Use Memo: It allows memoizing a value so that it’s only recomputed when the dependencies change. It helps optimize expensive computations.
Use Callback: It returns a memoized callback function, which helps optimize performance by preventing unnecessary rerenders of child components.
These are just a few examples of hooks available in React. You can also create custom hooks to encapsulate and reuse specific behavior across multiple components.
Hooks have greatly simplified state management and component lifecycle in React, making it easier to write and maintain functional components. They have become a fundamental part of modern React development.