Web Reference: Understand JavaScript closures with clear visual diagrams and examples—scope chains, memory retention, and practical use cases. 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 can be confusing with the this keyword because this is determined by how a function is called, not where it is defined, so inside a closure it may not refer to the expected object.
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