How the virtual DOM works? ReactJS tutorial - Virtual DOM
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In ReactJS, the virtual DOM (Document Object Model) is a lightweight copy of the actual DOM that React uses to keep track of changes to the user interface. The virtual DOM provides a way for React to update the UI efficiently without the need for the developer to manage the DOM directly.
Here's how the virtual DOM works in ReactJS:
Whenever there is a change to the state of a component, React creates a new virtual DOM tree that represents the updated UI.
React then compares the new virtual DOM tree with the previous one to determine what has changed.
Once React has identified the differences between the old and new virtual DOM trees, it calculates the most efficient way to update the actual DOM.
React then updates the real DOM with the minimal set of changes necessary to reflect the updated UI.
By using the virtual DOM, React is able to optimize the process of updating the UI, resulting in faster and more efficient rendering of changes. Since the virtual DOM is a lightweight copy of the actual DOM, it can be quickly updated and manipulated without causing unnecessary re-renders or reflows.
Overall, the virtual DOM is a key feature of ReactJS that enables developers to build complex UIs with high performance and maintainability.
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