Question 1

Where are closures used in real JavaScript code?

Accepted Answer

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

Question 2

What is a closure in simple words?

Accepted Answer

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

Question 3

Are closures important for interviews?

Accepted Answer

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

Question 4

What are closures used for?

Accepted Answer

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

Where are closures used in real JavaScript code?

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