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In JavaScript, closures are created every time a function is created, at function creation time.A closure can be defined as a persistent scope that is held onto by a variable.

In other words, a closure gives you access to an outer function's scope from an inner function. The combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment). Like other JavaScript fundamentals, understanding closures is. It is commonly used in functional programming languages, but often misunderstood.

The closure is a powerful tool in JavaScript.Much of the code we write in front-end JavaScript is event-based - we define some behavior, then attach it to an event that is triggered by the user (such as a click or a keypress). Situations where you might want to do this are particularly common on the web. That is one can archive real private data in JavaScript using closures. Nevertheless, closures in JavaScript can be used to store private data. However, we need closures for Data hiding and Encapsulation, Currying and Design Patterns. Closures in JavaScript make a lot of meaning and sense in the functional programming world.

To expose a function, we need to return it or pass it to another function. To use a closure, just characterize a function inside another function and uncover it. In JavaScript, closures are made each time a function is made, at function creation time.

As it were, a closure gives you access to an external function's scope from an inward function.

In other words, we can say closure is a way which allows functions that is present inside outer functions to access the outer function's scope. In JavaScript, when a function is created, the closure also created. In JavaScript, the closure is an environment which helps us to access an outer function's scope from an inner function.

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