JSX
JSX (JavaScript XML) is a syntax extension for JavaScript that allows developers to write HTML-like code within JavaScript, primarily used with React to describe the structure of UI components. It provides a more intuitive and declarative way to define user interfaces by blending markup with logic, making code easier to read and maintain. JSX is not a separate language but gets transpiled into regular JavaScript function calls, typically using tools like Babel.
Developers should learn JSX when working with React or similar libraries, as it is the standard way to define component structures in React applications, enabling efficient rendering and state management. It is particularly useful for building dynamic, component-based web interfaces, such as single-page applications (SPAs) or complex dashboards, where UI logic is tightly integrated with JavaScript. Using JSX improves developer productivity by reducing the cognitive load of switching between separate HTML and JavaScript files.