What code is macOS written in?

Mac. Mac computers are also powered by C, since the OS X kernel is written mostly in C. Every program and driver in a Mac, as in Windows and Linux computers, is running on a C-powered kernel.

What is Mac programming language?

Swift is a robust and intuitive programming language created by Apple for building apps for iOS, Mac, Apple TV, and Apple Watch. It’s designed to give developers more freedom than ever. Swift is easy to use and open source, so anyone with an idea can create something incredible.