Hi, I am the author of the library mentioned in the article (not the article author, that's someone else). You seem to have missed the link to the OOP library

Hi, I am the author of the library mentioned in the article (not the article author, that's someone else). You seem to have missed the link to the OOP library used, so here it is: https://github.com/kikito/middleclass https://github.com/kikito/middleclass Also, notice that in other comments on this thread I mention that I don't think OOP in Lua it's a one-size-fits-all thing. I think middleclass has its uses, but most of the time plain Lua with some metatables does the trick just fine.