ReactJS Tutorial - Introduction

What is React?

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Open source JavaScript library for building user interfaces.

• Not a framwork, but library
• Focus on UI
• React has a rich ecosystem and plays really well with other libraries.

Why learn React?

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• Created and maintained by Facebook
• More than 100k stars on Github
• Huge community
• In demand skillset

Component Based Architecture

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React has a component based architecture, this let you break down your application into small encapsulated parts, which then can be composed to make more complex UIs.

For example, a traditional website can be broke down into:

• HEADER
• SIDENAV
• MAIN CONTENT
• FOOTER

Each section represents a component which make up the entire website.

Reusable Code

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Components also make it possible to write reusable code.
리액트로 작성한 특정 컴포넌트를 다른 Angular, Vue 같은 다른 라이브러리에서도 사용할 수 있다. 기업에게 큰 장점이다.

React is declarative

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• Tell react what you want and React will build the actual UI - declarative paradigm. ( <-> imperative paradigm)
• React will handle efficiently updating and rendering of the components.
• DOM updates are handled gracefully in React.

More on why React?

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• Seamlessly integrate react into any of your application.
• React native for mobile application.