12.4 OOP in R: Two Paradigms

1. Encapsulated OOP

• Objects “encapsulate”
  • Methods (i.e., what can be done)
  • Fields (i.e., data on which things are done)
• Calls communicate this encapsulation, since form follows function
  • Form: object.method(arg1, arg2)
  • Function: for object, apply method for object’s class with arguments arg1 and arg2

2. Functional OOP

• Methods belong to “generic” functions
• From the outside, look like regular functions: generic(object, arg2, arg3)
• From the inside, components are also functions

12.4.1 Concept Map

Mermaid code

DiagrammeR::mermaid("
graph LR

OOP --> encapsulated_OOP
OOP --> functional_OOP

functional_OOP --> S3
functional_OOP --> S4

encapsulated_OOP --> R6
encapsulated_OOP --> RC
")