JavaScript Mastery from Zero to Hero - Prepare for Coding Interviews - The Difference Between Var and Let in JavaScript

The video tutorial introduces JavaScript variable declaration using 'var' and its issues, such as being easily overwritten. It then explains how ES6 addresses these issues with the 'let' keyword, which prevents variable redeclaration errors. The instructor provides a code example to demonstrate the difference between 'var' and 'let', emphasizing the importance of using 'let' for error prevention in large codebases. The session encourages note-taking and coding along for better learning.

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