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Understanding Closures in JavaScript: A Comprehensive Guide

Tutorial August 30, 2024
javascript

Closures allow you to maintain state across multiple function calls:

function createCounter() {
    let count = 0;

    return {
        increment: function() {
            count++;
            return count;
        },
        decrement: function() {
            count--;
            return count;
        },
        getValue: function() {
            return count;
        }
    };
}

const counterObj = createCounter();
console.log(counterObj.increment());  // Output: 1
console.log(counterObj.increment());  // Output: 2
console.log(counterObj.decrement());  // Output: 1
console.log(counterObj.getValue());   // Output: 1

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