Naming booleans

Question

If I only want to check if something is impossible or not (i.e., I will not be using something like if(possible)), should I name the boolean notPossible and use if(notPossible) or should I name it possible and use if(!possible) instead?

And just to be sure, if I also have to check for whether it is possible, I would name the boolean possible and use if(possible) along with else, right?

Answer 1

You should probably use isPossible.

Negative names for booleans like notPossible is a very bad idea. You might end up having to write things like if (!notPossible) which makes the code difficult to read. Don't do that.