JavaScript Reactivity (Part 2): Deep vs. Shallow Reactivity Published 2026-05-22, About 14 minute read. Series: JavaScript Reactivity A Global Look Deep vs. Shallow Reactivity Coarse vs. Fine-Grained Reactivity Push vs. Pull Reactivity Reactivity as Cache Invalidation (Coming soon!) Agnostic Reactivity - Does It Exist? (Coming soon!) Reactivity and Scheduling (Coming soon!) When you first start…