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. Closures make it possible for a function to have "private" variables. A closure is created when a function remembers the variables from its outer scope, even after the outer function has finished executing. 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.
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