Logic operators in PARAM-O / inverting boolean value?

[PVBergkrantz]

Hello, I am trying to create an object in PARAM-O that has two variants the user can choose. So I made a boolean to say "is is version 1" true/false. If its true I want to change the visibility of some objects to true and some to false, and if its false to do the opposite. That is, I want to hide some stuff and show some others. So what I want is an operator to invert the boolean value, to make true->false and false->true. A simple "not" operator would work in other programming but I'm kind of stuck trying to make it work in PARAM-O.

[Miha Nahtigal]

Maybe you could use an expression? Something like {not($paramName)}

Expression (Graphisoft.com)

[PVBergkrantz]

I tried but it doesn't accept boolean as input, only number. I guess one workaround would be to make the user type 0 or 1 instead of checking the box but that is not ideal.

There's a lot of functionality still missing in the PARAM-O system. No logical operators at all as far as I can see? This makes booleans almost useless...