I would've also liked to know how hash maps are typically implemented in programming languages. For instance how the number of buckets is chosen and if buckets are added at runtime when the amount of items in the map changes. But I'll do some further research myself!
I deliberately didn't go in to that for a few reasons.
1. It would have made this article very, very long.
2. It's a bit out of scope for an article on hashing.
3. I think I might give hash maps their own article in future.
Hash maps are fantastically deep. So many different ways to do it. You'll find a lot of material online but I'd recommend Raymond Hettinger's talk on how Pythons hash map data structure has evolved over time: https://www.youtube.com/watch?v=p33CVV29OG8.
I would've also liked to know how hash maps are typically implemented in programming languages. For instance how the number of buckets is chosen and if buckets are added at runtime when the amount of items in the map changes. But I'll do some further research myself!