What causes the most useEffect bugs in React?

Dependency array mismatches from broken hook order—mostly conditional calls.

Can I use hooks outside React components?

No—only function components or custom hooks. Regular JS lacks the queue reset.

Fiber-linked queues persist; cursor resets to replay calls in order.

Hooks power modern React, but few grasp their guts. Turns out, it's all arrays and a resetting cursor—simple, elegant, inevitable.

theAIcatchup Apr 09, 2026 4 min read

Hooks rely on an array of slots and a per-render cursor reset—break order, break everything. 𝕏
Rules aren't arbitrary; they're dictated by the data structure, like physics. 𝕏
Master this, and useEffect deps, custom hooks become intuitive—no more frustration. 𝕏

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#Frontend Development #JavaScript State #React #React Hooks #javascript #react-internals #useEffect #useState

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Originally reported by dev.to