This post explains the purpose of useEffect in React, how side effects are handled in class-based components, and how to fix the stale closure problem with useEffect.

13m read time From leewarrick.com
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What is an “effect” anyway?Side Effects in ReactThen Came React HooksUseEffect and Previous State: Where things fall apartWhat is a “ref”, and how do you use one?Using Refs to avoid Stale ClosuresState Versus RefsParting Thoughts
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