Advanced Object-oriented Programming In R: Stat... Official

S4 is a more formal version of S3, requiring explicit class definitions with "slots" and typed data.

No formal validation; it relies on naming conventions (e.g., generic.class ). 2. S4: The Rigorous Contract Advanced Object-Oriented Programming in R: Stat...

90% of R tasks, especially providing print() , summary() , or plot() methods for new data types. Pros: Minimal boilerplate; easy to learn; highly flexible. S4 is a more formal version of S3,

Managing stateful objects (like database connections, caches, or GUI widgets) and avoiding R’s usual copy-on-modify behavior. S4: The Rigorous Contract 90% of R tasks,

The first step in strategic selection is understanding the fundamental divide in R’s approach to objects:

Methods belong to the object . You call them using the $ operator (e.g., my_object$do_something() ). The Core Systems 1. S3: The Pragmatic Standard

Encapsulation (private vs. public fields); reference semantics (modify objects in-place); method chaining.