## What is ReactJS?
React is an open-source JavaScript framework for building user interfaces (UI) and single-page applications. It was developed by Facebook and is widely used in web development. React uses a component-based architecture that allows developers to build complex UIs with reusable building blocks called components.

## ReactJS Key Features
Here are six recognizable features of React framework:

- Virtual DOM: React uses a virtual DOM to improve performance and update only the necessary parts of the actual DOM.
- Component-based architecture: React allows developers to build reusable UI components that can be shared across different parts of the application.
- JSX: A syntax extension for JavaScript that allows developers to write HTML-like syntax inside JavaScript code, making it easier to build UI components.
- One-way data flow: React uses a one-way data flow architecture that ensures data changes flow in one direction, making it easier to manage data changes and prevent data inconsistencies.
- React Native: React can be used to build native mobile apps for iOS and Android platforms using React Native.
- Large community and ecosystem: React has a large community of developers who contribute to its ecosystem, including libraries, tools, and plugins.

## ReactJS Use-Cases
Here are six use-cases of React:

- Building single-page applications: React is often used to build fast and responsive single-page applications.
- Building complex UIs: React's component-based architecture makes it easy to build complex UIs with reusable components.
- Mobile app development: React Native can be used to build native mobile apps for iOS and Android platforms.
- Building cross-platform desktop applications: React can be used to build cross-platform desktop applications using tools like Electron.
- Building static websites: React can be used to build static websites using tools like Gatsby.
- Building e-commerce websites: React can be used to build e-commerce websites with complex UIs and dynamic data.

## ReactJS Pros
Here are six pros of React:

- Fast and responsive UI: React's virtual DOM and one-way data flow architecture ensure fast and responsive UIs.
- Reusable components: React's component-based architecture makes it easy to build reusable UI components.
- Large community and ecosystem: React has a large community of developers who contribute to its ecosystem, including libraries, tools, and plugins.
- Cross-platform development: React can be used to build web, mobile, and desktop applications using various tools and libraries.
- Easy to learn: React's syntax and architecture are easy to learn for developers with JavaScript knowledge.
- Performance optimization: React provides various tools and techniques for optimizing performance, such as lazy loading, code splitting, and server-side rendering.

## ReactJS Cons
Here are six cons of React:

- Steep learning curve: React has a steep learning curve for developers who are new to JavaScript and web development.
- Complex setup: React's setup process can be complex and time-consuming for some developers.
- Lack of official guidelines: React's official documentation lacks clear guidelines on certain aspects of development, such as state management.
- Poor SEO performance: React's single-page applications can have poor search engine optimization (SEO) performance if not optimized correctly.
- Overhead of JSX: JSX can add overhead to the development process, as it requires additional tooling and configuration.
- Large bundle size: React's bundle size can be large, which can affect the performance of the application.

## ReactJS Summary
React is an open-source JavaScript framework for building user interfaces and single-page applications with a virtual DOM, component-based architecture, and large community and ecosystem. It is used for building fast and responsive UIs, complex UIs with reusable components, and cross-platform applications. While it has a steep learning curve and complex setup, it provides various performance optimization tools and techniques.


ReactJS

React Native - The Practical Guide [2021 Edition]

React - The Complete Guide (incl Hooks, React Router, Redux)

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ReactJS Programming Framework

ReactJS external tutorials

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