Hi, Being relatively new to OO programming and not so old on R, I noticed the possibility to do OO programming in R. But it seems there is two "paradigms" S3 that seems the old one but is the one used in the R.oo package and S4 which seems more recent As a starting point, which one is best to use? Is R.oo useful? what are the main difference between the two? Any feedback helpful. Many thanks in advance & have a nice weekend! Julien
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