suresh What is the purpose of virtual DOM in ReactJS and how does it improve the performance of the application?
The virtual DOM (Document Object Model) in ReactJS is a lightweight copy of the actual DOM. It is a JavaScript object that represents the structure of the actual DOM elements and their properties in memory along with their relationships.
The purpose of the virtual DOM in ReactJS is to improve the performance of the application by minimizing the number of updates to the actual DOM. When a change occurs in the application, React updates the virtual DOM first, then compares the updated virtual DOM with the previous version to determine the minimal number of changes required to update the actual DOM. This process is known as reconciliation.
By using the virtual DOM, React optimizes the updating process by batch-processing multiple updates and only re-rendering the components that have actually changed. This results in faster rendering performance and a smoother user experience compared to directly manipulating the actual DOM.
In summary, the virtual DOM in ReactJS improves the performance of the application by reducing the number of DOM manipulations needed, resulting in faster updates and a more efficient rendering process.
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