Where are closures used in real JavaScript code?

Callbacks (setTimeout, event handlers), higher-order functions (map, filter, reduce), the module pattern (data privacy), currying, memoization, and any function that returns another function.

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More FAQs in What Is a Closure in JavaScript?

A closure allows a function to remember variables from its outer scope.

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Yes. Closures are one of the most commonly asked JavaScript interview topics.

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Closures are used for data privacy, callbacks, event handlers, and many advanced JavaScript patterns.

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