G-code and M-code are the foundational languages that drive CNC (Computer Numerical Control) machinery and 3D printers.

Abstractions in programming, while hiding complexity and creating more distance to that machine code, help programmers get closer to the actual problems they’re trying to solve.

His run through the code breaks it down neatly into individual sections, so it’s possible to see what’s going on without an in-depth knowledge of machine code.