Quick Answer
In large apps, closures manage component state, private variables, and module-level caches. Watch for: closures in event handlers holding references to large component trees (prevents GC), accumulated closures in long-lived services (memory growth), and closures capturing stale values in async operations. Clean up by removing listeners and clearing caches on component destroy.
Answer
Closures allow functions to retain access to variables in their outer lexical environment, even after the outer function has executed. They are useful for encapsulation, private states, and modular structure in large apps. However, uncontrolled closures can lead to memory leaks when references persist longer than needed. Proper cleanup and scoped design help mitigate risks.
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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.
