Scope and Scope Chain are fundamental concepts of JavaScript and other programming languages. Yet, these concepts confuse many new JavaScript developers. The knowledge of these concepts is essential in mastering JavaScript.
Having a proper understanding of these concepts will help you to write better, more efficient and clean code. Which will, in turn, help you to become a better JavaScript developer.
So in this article, I will explain what scope and scope chain is, how JavaScript engine performs variable lookups, and the internals of these concepts.

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