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. Summary: in this tutorial, you will learn about JavaScript closures and how to use closures in your code more effectively. In JavaScript, a closure is a function that references variables in the outer scope from its inner scope. The closure preserves the outer scope inside its inner scope. Dec 14, 2025 · In this blog, we’ll break down closures step by step, starting with the basics of scope and lexical scoping, then diving into examples, practical uses, and common pitfalls.
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