React JSX

The JSX (JavaScript XML) extension syntax is used in React, one of the most popular JavaScript libraries used for creating user interfaces. With JSX, you can write HTML-like code in JavaScript, making component layout and structure easier.

You can directly write HTML tags and components in JavaScript code with JSX. Although it looks like HTML, it's not exactly the same. React elements are created from regular JavaScript function calls that are transformed into JSX calls.

Example of JSX code:

import React from 'react';

const App = () => {
  return (
    <div>
      <h1>Hello, JSX!</h1>
      <p>This is a JSX example.</p>
    </div>
  );
};

export default App; 

This code snippet defines a functional component named App. In the component, we define our UI structure using JSX. A div tag with an h1 heading and a paragraph contains a div with a p tag. The JSX code will be converted to JavaScript code using a transpiler such as Babel, which is typically used by React.

JavaScript expressions can also be embedded within curly braces using JSX . Within your JSX code, you can insert values or execute JavaScript code dynamically.

const greeting = 'Hello, React!';
const App = () => {
  return <h1>{greeting}</h1>;
}; 

With JSX, you can define UI structures concisely and expressively with React components. With JavaScript combined with HTML-like syntax, developers can create more intuitive user interfaces with the power of JavaScript.