Instruction: Explain the concept of Virtual DOM and its impact on rendering performance.
Context: This question aims to assess the candidate's understanding of the Virtual DOM concept, commonly associated with libraries like React, and its benefits in optimizing re-renders.
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When we talk about the Virtual DOM and its impact on performance, it's essential to understand that every time a change occurs in the web application—be it a user action or data update—the entire UI doesn't need to be re-rendered from scratch. Instead, the changes are first applied to the Virtual DOM. Then, a diffing algorithm compares the updated Virtual DOM with a pre-update version, identifying exactly which parts of the real DOM need to be updated. This selective rendering minimizes the amount of work done by the browser, leading to significantly improved performance....