What is ReactJS?

ReactJS is a popular JavaScript library used for building user interfaces, especially single-page applications where you need a dynamic and interactive user experience. It helps developers create reusable UI components that update efficiently.

Key Features of ReactJS

• Component-Based Architecture: React lets you build UIs by creating components that manage their own state and then compose them to make complex UIs.

• Virtual DOM: React uses a virtual DOM to optimize updates. Instead of changing the actual DOM directly, React makes changes to a virtual representation first, then updates the real DOM in the most efficient way.

• Declarative SyntaxReact allows you to describe what the UI should look like in a simple, declarative manner.

Example

• Imagine you’re building a weather app. With React, you can create a WeatherComponent that displays weather data and updates automatically whenever the data changes.

Activity

• Create a basic React component that displays 'Hello, World!' and renders it on a webpage. Experiment with changing the text to see how React updates the view.

Quiz