What is the answer of this expression NaN===NaN

Answer 1

https://stackoverflow.com/questions/19955898/why-is-nan-nan-false
https://www.quora.com/In-JavaScript-why-does-the-expression-NaN-NaN-give-a-false-value

Answer 2

NaN===NaN is false
NaN==NaN is false
in fact NaN is not equals anything in the JavaScript universe
NaN is not a thing,emptiness cannot qualify emptiness