This question explores JavaScript and addresses practical considerations related to: How do closures work in JavaScript and when should I use them?

Closures in JavaScript occur when a function retains access to its lexical scope, even when the function is executed outside that scope. They are useful for data encapsulation and creating private variables. function createCounter() { let count = 0; return function() { count++; return count; }; } const counter = createCounter(); console.log(counter()); // Output: 1 console.log(counter()); // Output: 2 ADDITIONAL COMMENT: - In this example, "createCounter" is a function that returns another function, which forms a closure. - The inner function retains access to the "count" variable, even after "createCounter" has finished executing. - Closures are useful for creating private variables and functions, as shown in the example where "count" is not accessible directly from outside. - Use closures when you need to maintain state between function calls or when you want to encapsulate functionality. ✅

How do closures work in JavaScript and when should I use them?

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How do closures work in JavaScript and when should I use them?

Asked on Jan 25, 2026

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Closures in JavaScript occur when a function retains access to its lexical scope, even when the function is executed outside that scope. They are useful for data encapsulation and creating private variables.

<!-- BEGIN COPY / PASTE -->
        function createCounter() {
            let count = 0;
            return function() {
                count++;
                return count;
            };
        }

        const counter = createCounter();
        console.log(counter()); // Output: 1
        console.log(counter()); // Output: 2
        <!-- END COPY / PASTE -->

Additional Comment:

In this example, "createCounter" is a function that returns another function, which forms a closure.
The inner function retains access to the "count" variable, even after "createCounter" has finished executing.
Closures are useful for creating private variables and functions, as shown in the example where "count" is not accessible directly from outside.
Use closures when you need to maintain state between function calls or when you want to encapsulate functionality.

✅ Answered with JavaScript best practices.

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How do closures work in JavaScript and when should I use them?

Asked on Jan 25, 2026

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