Web Reference: Nov 4, 2025 · A closure is the combination of a function bundled together (enclosed) with references to its surrounding state (the lexical environment). In other words, a closure gives a function access to its outer scope. In JavaScript, closures are created every time a function is created, at function creation time. This tutorial introduces you to the JavaScript closure and shows you how to apply closures in your code more effectively. This guide will demystify closures, explaining what they are, why they’re important, and how to use them effectively. We’ll explore practical examples, common pitfalls, and best practices, all designed to make you a more confident JavaScript programmer.
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