When should you not use closures for state management in JavaScript?
For simple state that does not need privacy, a plain object or class is simpler and more readable. Use closures when you need true privacy, functional patterns, or per-instance state that should not be externally accessible.
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More FAQs in Common Closure Pitfalls and How to Avoid Them in JavaScript
A closure that captures a variable from a previous render (common in React useEffect with missing deps). The variable never updates. Fix by using the functional form of setState (setCount(c => c + 1)) or adding the variable to the dependency array.
Use .bind(obj) to permanently bind this, or wrap the method call in an arrow function (() => obj.method()), or define the method as an arrow in the object. Arrows inherit this lexically, so they preserve the correct binding.
Remove handlers when no longer needed (removeEventListener, clearInterval), do not close over large objects unnecessarily (extract only what you need), use WeakMap for caches, and clear references when done.
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