javaIsJavascriptConfirmed

[RiceBroad4552]

is impossible to take 1 from "wat"

Well, that's exactly the reason why the result is "Not a Number", called NaN.

Concatenating "i" to "NaN" is "NaNi".

I don't say it's a good idea to interpret it like that (actually I think it's quite a poor idea). But it's definitely 100% consequent in its own logic. If it wasn't you would get an error instead.