Math.sqrt() will give us decimals that aren't equal to zero if the number in its parameter is not a perfect square. So, when it goes through the ternary statement below it, it will go to the false section immediately and return -1.

Also, adding one is only going to help us if 'sq' is a perfect square, otherwise, it's not going to change anything (i.e. if the number isn't a perfect square).

You kind of need to look at it upside down and disect it a little bit.
Hope this helps.

It took me a second, but this is brilliant.

Clever girl