Web Reference: Function (local) variables are deleted when the function is completed. In a web browser, global variables are deleted when you close the browser window (or tab). Feb 22, 2026 · In this article, we’ll break down how JavaScript scope really works, explain global, function, and block scope, show common mistakes developers make, and give you a mental model you can actually ... Nov 13, 2023 · In JavaScript, global scope is the widest scope available. Variables declared in global scope are accessible from anywhere in your code, whether it's inside functions, conditional statements, loops, or other blocks of code.
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