The article doesn't make this analogy, that was my point. It doesn't really delve into immutable data structures at all, and just discusses FP in broad strokes.

The article doesn't make this analogy, that was my point. It doesn't really delve into immutable data structures at all, and just discusses FP in broad strokes. This isn't really a bad thing, since I don't think it was meant to be a deeply technical article.