Image Transcription: Meme

[Four images of toilet roll holders, each with text above them.

The first shows a toilet roll holder holding a partially-used roll of toilet paper. Its text reads, "Non-zero value".

The second shows a holder holding a completely used roll of toilet paper, leaving just the cardboard tube. Its text reads, "0".

The third shows a holder with no toilet roll or cardboard tube on it at all. Its text reads, "null".

The fourth shows no holder; simply plain wall. Its text reads, "undefined".]

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In C/C++, undefined should be the meme of the little girl smiling while the house burns down behind her.

Now give me a negative number

No, at least for JS the picture for undefined should actually be for "not defined" which yes is different. Undefined would be an empty holder without the spool holder.

0 = a 0 value

null = a value that means no value

undefined = the variable doesn't point to a value

not defined = there is no variable or anything

I see how you censored at "undefined". Thanks. The actual value could easily kill anyone who sees it.

not sure the distinction between null and undefined is doing anything for me here

Rust is neat because it doesn't have the bottom 2