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# Understanding Closures in JavaScript JavaScript closures are functions that have access to the variables from another function’s scope. This is often used for data encapsulation and creating private methods. ## What is a Closure? A closure is created when a function is defined within another function, allowing the inner function to access the outer function’s variables. For example: ```javascript function outerFunction() { let outerVariable = 'I am outside!'; function innerFunction() { console.log(outerVariable); // Accessing the outer function's variable } return innerFunction; } const closure = outerFunction(); closure(); // Outputs: I am outside! ``` ## Common Use Cases 1. **Data Encapsulation:** Closures can be used to encapsulate data, providing a way to create private variables that cannot be accessed from outside the function. ```javascript function createCounter() { let count = 0; return function() { count++; return count; }; } const counter = createCounter(); console.log(counter()); // Outputs: 1 console.log(counter()); // Outputs: 2 ``` 2. **Event Handlers:** Closures are often used in event handlers to retain access to variables even after the outer function has

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Closures are a fundamental concept in JavaScript that every developer should understand. They allow for function scope and provide powerful tools for creating private variables and methods. In this blog, we’ll explore how closures work, common use cases, and best practices.

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