Web Reference: These two keywords provide Block Scope in JavaScript. Variables declared with let and const inside a code block are "block-scoped," meaning they are only accessible within that block. Jul 11, 2025 · The scope is the current context of execution in which values and expressions are "visible" or can be referenced. If a variable or expression is not in the current scope, it will not be available for use. Feb 12, 2026 · This guide goes deeper than "a function that remembers its outer variables": you will learn exactly how JavaScript scope works, why closures exist, and how to use them to write cleaner, more private, and more performant code.
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