Apple continues to heavily promote Swift as the preferred programming language for its platforms, but Objective-C still holds a significant presence. A recent study shows that Objective-C remains the core language of iOS, with most apps using it directly or indirectly. Additionally, many frameworks shipped on macOS are still written in Objective-C. An interesting trick is transpiling Objective-C to C++, which provides insight into the Objective-C runtime and underlying mechanics. The article showcases an example of transpiling an Objective-C program to C++, highlighting various parts of the generated code. The transpiler has some limitations and inconsistencies but can still serve as a valuable learning tool for Objective-C.
https://www.jviotti.com/2023/12/01/understanding-objective-c-by-transpiling-it-to-cpp.html