Context-dependent method dispatch

[Matthew Browne]

I thought this article was interesting:

https://proandroiddev.com/an-introduction-context-oriented-programming-in-kotlin-2e79d316b0a2

It seems that the Kotlin language has accidentally discovered a
context-sensitive alternative to traditional double dispatch. There are
many similarities with C# extension methods or Rust extension traits (to
the extent that I understand those), but the later examples in the
article show some features that might be unique to Kotlin.

Kotlin's extension functions could definitely be used to implement a
form of DCI...I haven't tried it (yet), so I'm not sure how well it
would work. But it seems like an interesting tool for role-based
programming in any case.