What are the best practices for using closures in modern JavaScript?
Use let in loops, do not close over large objects, remove event listeners and timers, use functional setState in React, bind or arrow for this, use closures for privacy (not everything), keep closures short-lived, use WeakMap for caches, and name closures for debugging.
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More FAQs in Closures Best Practices in Modern JavaScript
Do not close over large objects (extract what you need), remove event listeners and clear timers when done, use WeakMap for caches (entries are removed when the key is GC'd), and keep closures short-lived in long-running apps.
Use the functional form of setState (setCount(c => c + 1)) which receives the latest state. Or add the state to the useEffect dependency array. Or use useRef to hold the latest value. Or use useReducer (dispatch is stable).
No. Use closures when you need true privacy or functional patterns. For simple state that does not need privacy, a plain object or class is simpler and more readable. Overusing closures adds complexity.
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