Why can't I call React hooks inside loops or conditions?

Order. The hidden cursor assigns slots sequentially. Skip one? Next hook grabs wrong slot, state swaps identities. Always top-level for consistent sequencing.

What is the React hooks cursor and why reset it?

Cursor tracks current hook slot in the component's state array. Resets to zero per render so calls refill predictably. No reset? Cumulative mess across renders.

How does understanding hooks fix useEffect dependency issues?

Deps snapshot slot values at call time. List all used state/effects exhaustively—effect re-runs precisely when they change. No magic, just array fidelity.

🛠️ Developer Tools

98% of React Devs Use Hooks Daily—But 37% Can't Tame useEffect. Here's Why

Picture this: Nearly every React developer leans on hooks, yet a shocking 37% battle useEffect daily. Turns out, it's not you—it's the black box nobody explains.

theAIcatchup Apr 09, 2026 4 min read

Diagram of React hooks state array with cursor advancing through slots during renders

⚡ Key Takeaways

Hooks rely on a per-component array and resetting cursor for ordered state slots—rules enforce this physics. 𝕏
useEffect frustrations stem from closure traps over array slots; exhaustive deps are non-negotiable. 𝕏
Mastering hooks unlocks React's concurrent future, from streaming to AI components. 𝕏

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theAIcatchup

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

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Originally reported by Dev.to

⚡ Key Takeaways

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