What are some examples of closures in JavaScript?

What are some examples of closures in JavaScript?

Closures are functions that remember their outer variables even when the function is executed outside its original scope. For example, here's a simple closure:

function makeCounter() {
    let count = 0;
    return function() {
        count++;
        return count;
    };
}
const counter = makeCounter();
console.log(counter()); // 1
console.log(counter()); // 2

Can you explain how this closure works?

Sure! The makeCounter function creates a private variable count and returns an inner function that increments and returns count. Each time you call counter(), it retains access to the count variable.

Are there any real-world applications for closures?

Yes, closures are often used for data encapsulation, creating private variables, and in event handlers to maintain state.