What is the virtual DOM in React?
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The Virtual DOM (Document Object Model) in React is a lightweight, in-memory representation of the actual DOM. It helps React manage and update the user interface efficiently.
When a component’s state or props change, React doesn’t immediately update the real DOM. Instead, it:
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Creates a new Virtual DOM that reflects the updated UI.
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Compares the new Virtual DOM with the previous one using a process called reconciliation.
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Calculates the difference (diff) between the two versions.
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Updates only the changed parts in the actual DOM, minimizing direct manipulation.
This approach improves performance because updating the real DOM is relatively slow. By reducing the number of direct DOM operations, React ensures smoother and faster rendering, especially in complex applications.
The Virtual DOM also allows React to batch updates and apply them more efficiently. It abstracts the DOM manipulation process, enabling developers to focus on describing how the UI should look rather than how to change it.
In summary, the Virtual DOM is a core feature of React that boosts performance and simplifies UI development by optimizing how changes are applied to the browser’s DOM.
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