Javascript:Guess output of given code

 

Guess:

Guess output of following code.

Code:

console.log(NaN === NaN)

const set = new Set([NaN, NaN]);

console.log(set.size);

console.log(Object.is(NaN,NaN))

Output:

false

1

true

Explaination:

    Two NaN are not equal in == comparision but Object.is has them equal.

set size will be 1 because in set consider it unique.