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. 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. There are several types of scopes of a variable. Let us understand these one by one. 1. Global and Local Scope. In JavaScript, the scope of a variable determines where it can be accessed within the code. In this tutorial, you will learn about variable scope in JavaScript with the help of examples.
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