Web Reference: Feb 8, 2026 · A closure is created when a function is defined inside another scope and references variables from that outer scope. Even after the outer function finishes, the inner function can still access those variables because JavaScript keeps the lexical environment alive as long as it’s reachable. This guide provides a curated list of JavaScript function-related interview questions commonly asked by employers. Each question focuses on an essential aspect of functions, such as closures, higher-order functions, callbacks, async/await, and function scopes. This article provides a curated selection of interview questions focused on JavaScript closures. By working through these questions and their detailed answers, you will deepen your understanding of closures and be better prepared to demonstrate your expertise in technical interviews.
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