Naming in a certain way is mostly for explanatory reasons in the tutorials and minimally for actual code. I just name the top one Visitorxxx and the rest as pe

Naming in a certain way is mostly for explanatory reasons in the tutorials and minimally for actual code. I just name the top one Visitorxxx and the rest as per their actual function. And when reading about them I also could not remember until using them multiple times. But at the end of the day, you learn each one, and then don’t need to remember how the respective parts of the code work. Else after a few months I would need to go line by line of probably worse code, unless in a happy accident I had reinvented them.