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0 vs null vs undefined - explained with toilet paper (i.stack.imgur.com)

submitted 2 years ago by [email protected] to c/[email protected]

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[-] [email protected] 3 points 2 years ago

Depends on the programming language. In JavaScript, it literally means that like the key or variable does not actually exist. Whereas like in C/C++, writing random bytes to random memory addresses would result in "undefined behaviour" which means basically anything could happen.

[-] [email protected] 2 points 2 years ago* (last edited 2 years ago)

In Javascript you can do let a = undefined, defining the variale a as undefined.

A significant difference to defining it as null is that typeof null == "object", while typeof undefined == "undefined".

this post was submitted on 06 Jul 2023

542 points (97.4% liked)

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