Understanding Closures

What is Closures?

Closures are a foundational concept in JavaScript that allows inner functions to access variables from their parent function's scope, even after the parent function has finished executing. This makes closures a powerful tool for data privacy, callbacks, and functional programming.

Why do I need it?

A closure is created when an inner function captures references to variables from an outer function's scope. For example:

function outer() {
    let outerVar = 10;

    function inner() { …

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