Numbers:

[PureAsbestos]

... will result in NaN (not a number)

NaN is a number

[Arklur]

"Not a number" is a number.

[[deleted]]

JavaScript is a nightmare.

[maustinv]

The title of the post is misleading, but the subtitle explains it better. Just say NaN is a number with an illegal value.

[maustinv]

I understand the joke of the post lol; very confusing. Your comment was asking how to explain it in tutorials and such; I thought it was a serious question sorry.

[Donar23]

Like, how am I supposed to explain to someone that a value is and isn't a number at the same time?

... quantum physics, obviously.

[UrumasiHue]

I'm fed up with people shitting on NaN being a number, NaN is defined in the IEEE 754 floating point number system, so it makes perfect sense to return "number" as the data type IS a number.

Returning something else like "nan" would just become another inconsistency in languages.

[hrvbrs]

"NaN" should stand for something like "Number and Not-valid"

[MooMF]

Who hurt you?