Which language is the most commonly used for the shared logic of Android and iOS apps? Kotlin? C++? Other?

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Foreign Function Interface

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  • SWIG

    SWIG is a software development tool that connects programs written in C and C++ with a variety of high-level programming languages.

    • Do what DropBox did for many years. DropBox wrote a blog post about how they used to share their core C++ systems code between their apps. Eventually they gave up and decided it was easier to just write the same code twice, once in Java and once in Swift. However, they went about doing this in a very bizarre way, using their own custom build tooling and whatnot. In particularly, they tried to share C++ data types between Android and iOS via manually generated language bindings via stuff like SWIG. I don't recommend their approach, but it is an approach, so I feel like it's worth mentioning.

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