What are components in React?

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Components in React are the building blocks of any React application. They are independent, reusable pieces of UI that help in creating complex interfaces by breaking them into smaller, manageable parts. Each component is like a JavaScript function or class that returns JSX, which is a syntax extension that looks like HTML.

React supports two main types of components:

1. Functional Components:
   These are simple JavaScript functions that take props as input and return JSX. With React Hooks (like useState, useEffect), functional components can also handle state and side effects.

   function Greeting(props) {
     return <h1>Hello, {props.name}!</h1>;
   }
   

2. Class Components:
   These use ES6 class syntax and extend React.Component. They must have a render() method that returns JSX. They also support lifecycle methods.

   class Greeting extends React.Component {
     render() {
       return <h1>Hello, {this.props.name}!</h1>;
     }
   }
   

Key Features:

• Reusability: Write once and use across multiple parts of the app.

• Modularity: Each component handles a specific part of the UI.

• Composability: Components can contain other components.

• Separation of concerns: Logic, style, and UI can be managed within the same component.

In a React app, you typically have a root component (like App) and many child components that form the component tree.

In summary, components in React allow developers to build scalable, maintainable, and dynamic UIs efficiently by organizing the code into logical, reusable units.

Read more: 

Nested and Dynamic Routes with React Router

What is React and why is it used?

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