In-depth articles, tutorials, and guides on Rendering & Frameworks — covering everything from fundamentals to advanced patterns.
The virtual DOM is one of the most discussed ideas in frontend development, yet the actual algorithm behind it — and why it makes tradeoffs it does — is rarely explained clearly. Here is what actually happens when React diffs two trees.
Every time state or props change, React has to figure out what actually changed in the UI and update only those parts. The process behind this decision is called reconciliation — and understanding it will change how you write components.