What is JSX, and how does it work under the hood in React?
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JSX (JavaScript XML) is a syntax extension for JavaScript used in React to describe what the UI should look like. It allows developers to write HTML-like code directly within JavaScript, making the structure of components more intuitive and readable.
While JSX looks like HTML, it’s actually syntactic sugar for React.createElement() calls. Under the hood, the JSX above is compiled (typically by Babel) into:
This createElement function returns a React element, which is a plain JavaScript object describing a UI node: its type (e.g., 'h1'), props (attributes), and children. This object is part of React’s Virtual DOM, an in-memory representation of the actual DOM.
When rendering, React compares the current Virtual DOM with the previous one using a process called reconciliation. It then efficiently updates only the parts of the real DOM that have changed, minimizing costly direct DOM manipulations.
JSX also supports JavaScript expressions inside {} and can embed components, allowing a declarative and component-based approach to building UIs.
In short, JSX improves developer experience by making UI code easier to write and read, while React transforms it into optimized JavaScript instructions that power the Virtual DOM and efficient rendering.
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