You are welcome. Switching from C++ to JS is not trivial especially since vtk.js is not just compiling the C++ code so you can write JS like you would do in C++. (Which I think is a good thing)
It is also trying to leverage the flexibility and capability of JS itself which leads to slightly different way to achieve the same thing even if the concept remain similar.
Anyway adding more examples or documentation in how to transition is indeed good but not always easy to do. Maybe we could create an issue that could list the topics that the community would like to see described or extended. Feel free to initiate it.