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React Deep Dive
Hooks, reconciliation, performance
15 min read+200 XP on completionCert: Frontend Engineering
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# React Deep Dive
Virtual DOM
React keeps a virtual DOM in memory. On state change it diffs the new virtual tree against the old one and patches only changed real DOM nodes.
Key Hooks
useState for local state, useEffect for side effects, useMemo for expensive computations, useCallback for stable function references.
Performance
React.memo skips re-renders when props are unchanged. useMemo and useCallback prevent unnecessary child updates.
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Reconciliation
useState
useEffect
React.memo
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