Answer
A closure is a function that retains access to its outer scope even after the outer function has finished executing.
Use cases: private variables, memoization, function factories, event handlers.
Quick Answer
Closures in real use: a counter factory function returns a function that increments a private count variable — each call creates a new independent counter. Memoization stores results in a closed-over cache object. Module patterns use closures to create private state accessible only through exposed functions. Event handlers close over component state in React hooks.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ