Web Reference: Nov 13, 2023 · Global, Local, and Block Scope: JavaScript offers different types of scope, each serving specific purposes. Global scope provides broad accessibility, local scope offers isolation, and block scope controls visibility within specific code blocks. With JavaScript, the global scope is the JavaScript environment. In HTML, the global scope is the window object. Global variables defined with the var keyword belong to the window object: Global variables defined with the let keyword do not belong to the window object: Do NOT create global variables unless you intend to. 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.
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