var $ = []

![] == false because [] exists.

false + [] == 'false' because anything added to an array will become whatever that is as a string plus the contents inside the array.

2 + [] is also a string "2"

2 + [2,2] will become "22,2" (string)

Wow, I knew the + operator was weird, but didn't realise it allowed you to do stuff like that.

What I don't get though, wouldn't you still need to call eval() on it to do anything with it? Or does javascript do a 'implied eval' when you try to call a string?