undefined vs not defined in JS 🤔 | Namaste JavaScript Ep. 6

Title:

Description:

undefined is a special keyword in JavaScript and `undefined !== not defined`. JS is a loosely typed language (weakly typed language). This video covers an in-depth analysis of the undefined keyword and mistakes you should avoid while using this keyword. It is a special keyword in JS and it acts as a placeholder for variables until they are assigned any value in them.

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. So watch this video to understand everything in deep.

Topics Covered:
00:00 - Introduction to undefined in JavaScript
00:29 - Code Example of undefined in JS
02:02 - Code Example of not defined in JS
04:33 - undefined vs not defined demo using code
07:46 - JS is a loosely typed language a.k.a weakly typed language
08:42 - Mistake you should not make while using undefined
10:17 - Teaser of next video - The Scope Chain
10:30 - Thank you for watching Namaste JavaScript 🙏

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Akshay Saini
http://akshaysaini.in

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YouTube url:	https://www.youtube.com/watch?v=B7iF6G3EyIk&list=PLlasXeu85E9cQ32gLCvAvr9vNaUccPVNP&index=8
Created:	6. 3. 2021 14:04:44

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undefined vs not defined in JS 🤔 | Namaste JavaScript Ep. 6