Closures in JavaScript: Understanding and Applications

Learn about closures and how to use them in JavaScript for powerful and efficient code

Hello subscriber,

In JavaScript, closures are a powerful feature that allows you to retain access to variables from parent scopes, even after the parent function has finished executing. This allows you to create private variables and methods, handle events, work with callbacks, and more.

For example, let's take a look at how we can use closures to create a simple counter object:

function createCounter() {
    let count = 0;
    return {
        increment() {
            count++;
        },
        decrement() {
            count--;
        },
        getCount() {
            return count;
        }
    }
}

Now, let's test out our counter object:

let counter = createCounter();
console.log(counter.getCount()); // 0
counter.increment();
console.log(counter.getCount()); // 1
counter.decrement();
console.log(counter.getCount()); // 0

As you can see, our counter object has a private count variable that is only accessible through the increment, decrement, and getCount methods. This is the power of closures in action!

If you want to learn more about closures and other powerful JavaScript concepts, be sure to visit my blog post: https://pratapsharma.io/closure-in-javascript

Happy coding!

Pratap Sharma
Senior Software Engineer | Technical Writer
www.pratapsharma.io