>Once I get two or more levels of nesting, I find it far too easy to get confused about which level I'm on
Author here, I agree with you. I have the working memory of a small pigeon.
The flavor of data orientation we cover in the book leverages strongly typed representations of data (as opposed to using hash maps everywhere). So you'll always know what's shape it's in (and the compiler enforces it!). We spend a lot of time exploring the role that the type system can play in our programming and how we represent data.
Author here, I agree with you. I have the working memory of a small pigeon.
The flavor of data orientation we cover in the book leverages strongly typed representations of data (as opposed to using hash maps everywhere). So you'll always know what's shape it's in (and the compiler enforces it!). We spend a lot of time exploring the role that the type system can play in our programming and how we represent data.