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. Jan 16, 2026 · A closure is a function that remembers and accesses variables from its outer scope even after the outer function has finished executing. Retains access to outer function variables. Jan 26, 2026 · Closures are a cornerstone of JavaScript, but many developers struggle to understand them. Learn what closures really are, how they work under the hood, and how to use them effectively.
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