JavaScript Variables Explained: var vs let vs const (2026)
Confused about when to use var, let, or const? In this video, I break down my personal handwritten notes on JavaScript fundamentals to make scoping and variable declaration easy to understand.
Whether you are a beginner learning JavaScript or preparing for a technical interview (like TCS, Infosys, or startups), understanding how variables behave is crucial.
We explore the "Var Leak" phenomenon—why var ignores block scope and how it can ruin your code—and why let and const are the modern standards.
📝 What We Cover in This Video:
Running JS: How to execute code in the terminal (node basics.js).
Data Types: Dynamic typing, Numbers, and the typeof operator.
The Big 3: The exact difference between var, let, and const.
Reassignment vs. Redeclaration: Which keywords allow it and which don't.
Scoping Secrets: Block Scope vs. Function Scope explained.
The "Var Leak": A real-world example of how var escapes if blocks.
Automation Tip: Why you must use const for Locators.
💡 Key Takeaway: Always prefer let and const over var to avoid bugs!
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