How do React hooks actually work under the hood?

They're powered by a persistent array of hook slots and a cursor that resets to zero each render, ensuring calls map to the same slots in order.

Why can't I call React hooks conditionally or in loops?

It would shift the cursor, mismatching slots across renders — states would swap or vanish.

What fixes useEffect dependency array problems?

List all used values exhaustively; the system replays effects based on changes, but stale closures sneak in without full deps. And that's your hooks superpower. Build it. Run it. Never forget.

🛠️ Developer Tools

React Hooks Aren't Magic — They're a Linked List with a Cursor. Here's Proof.

You've followed React's hook rules for years without knowing why. This deep dive builds the system from zero, revealing a linked list cursor that turns mystery into mechanics — and fixes your useEffect woes forever.

theAIcatchup Apr 09, 2026 4 min read

Diagram of React hooks as a linked list with cursor resetting per render

⚡ Key Takeaways

Hook rules emerge inevitably from a cursor traversing a persistent array — not arbitrary. 𝕏
Understanding the linked-list mechanics demystifies useEffect deps and cuts bugs. 𝕏
React docs skip this blueprint; building from scratch is the real teacher. 𝕏

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theAIcatchup

Community-driven. Code-first.

#hooks-explained #hooks-internals #javascript #react #react hooks #react-internals

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⚡ Key Takeaways

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