What is JSX in React?

 JSX is an extension to the JavaScript language that allows developers to write HTML-like syntax within JavaScript code. It was originally introduced by React as a way to write declarative code for building user interfaces.

In JSX, you can write HTML-like tags to describe the structure of the UI, as well as JavaScript expressions to represent dynamic content. For example, here is a simple JSX expression that renders a "Hello World" message:

const element = <h1>Hello, world!</h1>;

This code will create a new element with the h1 tag and the text "Hello, world!" inside it. This element can then be rendered in the UI using React.

Under the hood, JSX is converted into regular JavaScript code by a tool called a "transpiler". This allows you to write code that looks like HTML, but still benefits from the power of JavaScript.

const items = ['apple', 'banana', 'orange']; const listItems = items.map((item) => <li>{item}</li>); const element = ( <div> <h1>My List</h1> <ul> {listItems} </ul> </div> );

This code will create a new div element with a h1 tag and an unordered list of items. The listItems array is generated dynamically using the map method, and each item is wrapped in an li tag. The result is a list of items that can be easily rendered in the UI.