Web Reference: Scope determines the accessibility (visibility) of variables. JavaScript variables have 3 types of scope: Variables declared Globally (outside any block or function) have Global Scope. Global variables can be accessed from anywhere in a JavaScript program. Variables declared with var, let and const are quite similar when declared outside a block. Mar 13, 2026 · There are several types of scopes of a variable. Let us understand these one by one. 1. Global and Local Scope. The image below shows Global and Local Scope in JavaScript to help understand their accessibility. 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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