An empty string will always return false, but in this case we should return true if the string ends up with no characters.

Roughly: sorted alphabetically as said in the description. Some Codewarrior absolutely wanted "code point"... You could have googled it:-)

here is some documentation. https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_Operators#Logical_NOT