JAVASCRIPT CHALLENGE QUESTION

Question

Please why is the output of this code true?

var x= Boolean(NaN===NaN)
var y= Boolean(NaN===NaN)
if(!x)
alert(x===y)
else
alert(y)

Answer 1

NaN means Not a Number.(can be anything but not a number) and cannot determined exactly. Then
x = false
y = false
!x is true
x===y =>false===false =>true