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. In JavaScript, a closure is a functionthat references variables in the outer scope from its inner scope. The closure preserves the outer scope inside its inner scope. To understand the closures, you need to know how the lexical scoping works first. 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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