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

Managing stateful objects (like database connections, caches, or GUI widgets) and avoiding R’s usual copy-on-modify behavior.

S4 is a more formal version of S3, requiring explicit class definitions with "slots" and typed data. Advanced Object-Oriented Programming in R: Stat...

Methods belong to generic functions , not the objects themselves. When you call plot(x) , R looks at the class of x and decides which plot method to run. When you call plot(x) , R looks at

No formal validation; it relies on naming conventions (e.g., generic.class ). 2. S4: The Rigorous Contract S4: The Rigorous Contract Reference Classes are built

Reference Classes are built into base R and function similarly to R6 but are built on top of S4.

Requires an external dependency; can lead to "non-idiomatic" R code if overused. 4. Reference Classes (RC): The Internal Alternative

Strict type checking; multiple dispatch (methods can choose logic based on multiple arguments). Cons: High "ceremony" and steep learning curve. 3. R6: The Modern Powerhouse