[steveklabnik]

So, I wrote that chapter, and part of why we don't really discuss definitions is that there are so many conflicting ones. Instead, we tried to focus on goals, and how they'd apply to Rust.

Personally, I believe the two big OOP definitions are "Java OOP" and "Smalltalk OOP", and Rust fits neither. People coming from heavy OOP backgrounds really struggle with Rust for this reason. It's also why this chapter was the hardest one to write.

Java: https://docs.oracle.com/javase/tutorial/java/concepts/ (Sometimes phrased as "Encapsulation, Inheritance, Polymorphism, Abstraction")

Smalltalk: http://wiki.c2.com/?AlanKaysDefinitionOfObjectOriented