Hands-On Design Patterns and Best Practices with Julia

Understanding behavior subtyping

Behavior subtyping is sometimes called interface inheritance. In order to avoid confusion with the overloaded word inheritance, we will avoid using the term interface inheritance here. Behavior subtyping says that a subtype only inherits behaviors from the supertype. 

As we switch the language back to Julia, we will refer to types rather than classes.

Julia supports behavior subtyping. Every data type inherits functions that are defined for its supertype. Let's try a quick and fun exercise in the Julia REPL:

Here, an abstract type, Vehicle, is defined with a subtype of Car. We have also defined a move function ...