Primitive R objects and S3
Objects are just lists and class is just an attribute.
Primordial R objects
The first thing to know is that nearly every object in R is really just a list with named elements. For example, the results returned from "summary" are returned in an object:
x <- summary(c(1:10)) x ## Min. 1st Qu. Median Mean 3rd Qu. Max. ## 1 …