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. Nov 13, 2023 · JavaScript offers various types of scope, with the three primary ones being global, local, and block scope. These scopes control the accessibility of variables in different parts of your code and play a pivotal role in maintaining code organization and preventing variable conflicts.
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