undefined or null

Question

the var a in this program is not defined. so it is printing undefined.
but the tutorial guy is getting null value as result but i am getting undefined.
can anyone tell me why?
https://code.sololearn.com/WFVPAcuaTrQK/?ref=app

Answer 1

Because your variable doesn't have value.
So it is showing undefined.

Answer 2

Vanilla JS always assigns unassigned variables (without an initial value) to undefined, undefined being an primitive data type. Null is the *intentional* absence of an object.

I am really confused, I don't know why he is getting null. Maybe modified JS, interpreter settings (if there are any), I really don't know. I couldn't either found anything on the internet.

Answer 3

Are you sure the source codes were exactly the same? you're talking about the tutorial guy Youtube channel right?

Answer 4

yes Ipang javascript tutorial in freecodecamp youtube channel

Answer 5

Ipang he is getting null as output

Answer 6

I don't know about other languages but in javascript

undefined is result if you define a variables but not assign its value.

Null is result if you assign null value to variable .

Answer 7

Share the link of video

Answer 8

Divya Mohan watch from 10:00 mins
https://youtu.be/PkZNo7MFNFg

Answer 9

That's a case among UB (Undefined Behavior) ones.
When a value is set without, initialization or without assigning it, so using this last one will be an ill-formed situation.