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.

Why is it recommended to take notes and code along during the lesson?

What is the main issue with using the 'var' keyword in JavaScript?

How has JavaScript changed over the years according to the lesson?

Discuss the importance of avoiding variable name conflicts in large codebases.

What does ES6 introduce to address the issues with 'var'?

What happens when you try to declare a variable with 'let' that has already been declared?

Explain the difference in behavior when declaring a variable with 'var' versus 'let'.