Agreed - though I prefer Swift, I loved my time with ObjC, and I can't say I even like any other language I've ever touched. There's no close 3rd place for me.

Agreed - though I prefer Swift, I loved my time with ObjC, and I can't say I even like any other language I've ever touched. There's no close 3rd place for me. And the gap widens when you take the ecosystems/frameworks into account. One thing I never really grokked though is the practical implications of message-passing vs method-calling. I read plenty of material about how it's implemented, but never found a scenario where I thought about it. Everything was always still just method-calling to my forebrain. Do you have any resource that talks about the practical implications?