How to Denote an API in a Modular Way

The more modular something is the easier it is to grok exactly what's happening in a method. Comments can explain literally everything that happens in a function, and if you use like chat GPT to write your comments for you, it will. But when I'm reading somebody else's code, I'm usually doing it with enough knowledge to glance at a block of code and understand what it's doing and how it's doing it. And the comments for me should just serve to it should be like one or two lines that denote here's here's what I did here.