difference between null and undefined

webMahesh · Sep 25, 2023

Can anyone explain the difference between null and undefined in JavaScript.

alurosu · Sep 25, 2023

Null is set by you. Undefined is unknown, unset.

There are cases in which you want something empty. That's null.

hideath · Sep 25, 2023

You can literally make a quick google search or ask ChatGPT for the anwser,
Don't bother yourself/others with each mini question,
Just a small advice, it will buy you/us plenty of time

Gogol · Sep 25, 2023

They are different things. Null is a value and it is a primitive. Undefined is not a value. Whenever you see undefined for a variable, it means that the memory has been assigned for that var, but it doesn’t have a value assigned to it.

FUTP · Dec 24, 2023

In addition to everything that was said before, when you are trying to use typeof null it will give you object, it`s because of old legacy bug, which is kept until this days, and typeof undefined will give you more obvious undefined. Also type casting will convert null and undefined, so == comparison will give you true between them, but not ===

ipolic · Oct 17, 2024

null represents an intentional absence of value, while undefined indicates a variable has been declared but not assigned.

difference between null and undefined

webMahesh

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hideath

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ipolic

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