Web Reference: Mar 13, 2026 · Scope determines where a variable can be accessed or used within a JavaScript program. It helps control the visibility and lifetime of variables in different parts of the code. 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. Sep 18, 2025 · Understanding scope is one of the most fundamental and, at times, most confusing aspects of learning JavaScript. But here's the good news: once you truly grasp scope, a whole world of JavaScript clarity opens up.
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