I was reading an interesting post on R-bloggers on ''Object Oriented Programming in R using S4 Classes". The book "Statistics and Computing" written by Venables and Ripley has some chapters introducing S3 classes and S4 classes in S and R and have been useful to me in terms of understanding the concept of object oriented programming in R.
Do you know of any useful book(s) introducing Object Oriented programming in R in more details with examples like the one in the R blogger?