Is NaN falsy? Why NaN === false returns false

Question

1. Why NaN === false => false, isn\'t NaN falsy?
2. Why NaN === NaN => false, but !!NaN === !!NaN => true

I\'v

Answer 1

NaN and false are both the subset of Falsy.

• NaN == false -> they're both falsy -> thus 'TRUE'
• NaN === false -> they're NOT the same type -> thus 'FALSE'