undefined vs not defined in JavaScript | Simplified Explanation

Are you confused about the difference between undefined and not defined in JavaScript? 🤔

In this video, we'll clarify the difference between:

✨ Undefined: when a variable has been declared but has no value
✨ Not Defined: when a variable has not been declared at all

We'll also cover:

✨ How to check for undefined and not defined variables
✨ How to avoid common pitfalls and errors
✨ Best practices for declaring and using variables in JavaScript

Whether you're a beginner or experienced developer, this video will help you master the fundamentals of JavaScript variables and avoid common mistakes. 💻

#JavaScript #Undefined #NotDefined #JavaScriptVariables #WebDevelopment #Programming

Understand the difference between undefined and not defined in JS. Many developers assume that undefined is exactly the same as not defined, but that's not true. undefined is a value in JavaScript and in fact, it also takes up memory space. Along with that we will see
"is not defined" "cannot access before initialization.." "null" "NaN" in the video it's important to understand all these things to do better debugging in javascript

Time stamps
00:00 -undefined
04:10 -is not defined
05:15 -cannot access before initialization..
08:01 -Temporal dead Zone
08:13 -null
09:14 -Type of null and undefined
10:04 -"==" and "==="
11:16 -Nan

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