Changing a generic | Changing dispatch | Adding an argument | Removing an argument | Changing a default | Renaming a generic | Removing a generic | Moving a generic to another package | Changing a class | Adding a property | Removing a property | Renaming a property | Changing a property's type or validator | Renaming a class | Aliasing a class | Removing a class | Moving a class | Designing for evolution | Summary

Generic-method compatibility | Generic with dots; method without dots | Generic and method with dots | Generic and method without dots | Customizing generics | Add required arguments | Add optional arguments | Do some work | super() | Multiple dispatch | A simple example | Special "classes"

Validation | Basics | When is validation performed? | Avoiding validation | Properties | Default value | Computed properties | Dynamic properties | Common Patterns | Deprecated properties | Required properties | Frozen properties | Constructors

Getting started | Classes | Generics and methods | Methods for suggested packages | Backward compatibility | S3 | Older versions of R

S3 | Methods | Generics | Classes | List classes | S4 | S7 classes that extend S4 classes | S4 classes that extend S7 classes | Unions

Classes and objects | Generics and methods | Named bindings | Method dispatch and inheritance

Challenges with S3 | Challenges with S4