Скачать или смотреть ReactJS Tutorial - 4 - Components (Hindi/Urdu)

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Components are the building blocks of a React.js application. They are reusable, self-contained pieces of UI that can be composed together to create complex user interfaces. In React, components can be classified into two main types: functional components and class components.

Functional Components:
Functional components are JavaScript functions that accept props (properties) as arguments and return JSX (JavaScript XML) to describe the UI. They are often used for simple presentational components that don't need state or lifecycle methods.

Class Components:
Class components are ES6 classes that extend the React.Component class. They have a render() method that returns JSX to describe the UI, and they can also have state and lifecycle methods. Class components are typically used for more complex components that need to manage state or use lifecycle methods.

Usage of Components:
Once you have defined a component, you can use it within other components or in your main application

Components in React.js promote reusability, modularity, and maintainability by breaking down the UI into smaller, manageable pieces. They can be composed together to create complex user interfaces while keeping the code organized and easy to understand.

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4:59 Summary