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 · Closures allow a function to keep variables private and accessible only within that function, which is commonly used in modules to protect data from being accessed or modified by other parts of the program. Jan 16, 2026 · Now you're ready to dive into closures and learn what they are, how they work, and why closures are one of the most powerful concepts in JavaScript. Functions and Parameters – The Basics
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