Why use scala's cake pattern rather than abstract fields?

Question

I have been reading about doing Dependency Injection in scala via the cake pattern. I think I understand it but I must have missed something because I still can\'t see the

Answer 1

Think about what happens if TwitterService uses TwitterLocalCache. It would be a lot easier if TwitterService self-typed to TwitterLocalCache because TwitterService has no access to the val localCache you've declared. The Cake pattern (and self-typing) allows for us to inject in a much more universal and flexible manner (among other things, of course).