For anyone going through the book and interested in looking up complete implementations, I've implemented quite a few of them in JS and Go:

https://github.com/peferron/algo

I'm at chapter 14.4 now, so still a long way to go.

(Note: activity the past 2 months was low because I was relocating and had nearly no free time. But I'm usually updating it actively. Gray code subset generation was added this morning. Integer partition generation and set partition generation are up next.)