React's Architecture
summary
React claims a lightweight virtual DOM of JS objects that diffs two trees and emits real DOM mutations, turning a naive O(n^3) tree diff into near O(n) work by restricting matching to children and using a key attribute backed by a hashmap to preserve node state. It batches setState calls to avoid repeated reflows, reuses DOM nodes to keep hidden state like scroll and selection, provides shouldComponentUpdate pruning and a perf tool that pinpoints wasted renders, and reports production use and billion‑user scale.
AI-written summary · about
chapters (12)
- 0:00React
- 0:38String Concatenation - 2004
- 3:57Custom Tags
- 7:48Naive
- 9:53Reuse Nodes
- 11:22Old School
- 14:40Children by Children
- 15:49Identity
- 21:11Virtual DOM
- 26:41Batching
- 28:23Subtree Re-rendering
- 30:58shouldComponentUpdate?
