Why do React hooks have to be called at the top?

Sequential cursor reset demands it — loops or ifs scramble order, state corrupts.

How does useState persist between renders?

Hooks array survives in fiber; cursor replays on re-render.

Will understanding hooks fix my useEffect deps?

Yes — deps mirror hook sequence; mismatches cause stale closures.

React Hooks Demystified: The Cursor That Makes Rules Inevitable

Hooks power modern React, yet their rules baffle even pros. Peeling back the layers reveals a simple data structure dictating it all — no magic, just clever engineering.

theAIcatchup Apr 09, 2026 3 min read

Simplified diagram of React hooks array with cursor advancing through slots

⚡ Key Takeaways

Hooks rules stem from a persistent array and resetting cursor — violate order, state collapses. 𝕏
useEffect frustrations (37% of devs) trace to cursor ignorance; grok it, bugs vanish. 𝕏
React docs enforce but don't explain — a rare pedagogy miss in polished ecosystem. 𝕏

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theAIcatchup

Community-driven. Code-first.

#hooks #javascript #react #react hooks #react-internals #useEffect #useState

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Originally reported by Dev.to

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