Shoes
Navigating to the tutorials section, I discovered to my joy that _why was clearly involved in this in some way. The online book[1] is written by them in their inimitable style.See also _why's other classic Ruby-related book, the Poignant Guide to Ruby[2].[1]: http://evc-cit.info/cit020/nks.pdf
[2]: https://poignant.guide/