Introduction to React

React is a JavaScript library for building user interfaces. It was developed by Facebook and is widely used in front-end web development.

Some key features of React include:

• Component-based architecture: React divides the user interface into reusable components, making it easier to manage and maintain code.
• Virtual DOM: React uses a virtual representation of the DOM (Document Object Model) which allows for efficient rendering of components and minimizes unnecessary updates to the actual DOM.
• One-way data flow: React follows a unidirectional data flow, where data is passed down from parent components to child components. This helps in maintaining a predictable state of the application.

React has gained popularity due to its performance, flexibility, and large community support. It is widely used in production applications and is backed by Facebook, which ensures its continuous development and improvement.

1import React from 'react';
2
3function HelloWorld() {
4  return <h1>Hello World!</h1>;
5}
6
7export default HelloWorld;

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import React from 'react';

​

function HelloWorld() {

  return <h1>Hello World!</h1>;

}

​

export default HelloWorld;