Comment by yorwba

The exercises are here https://news.ycombinator.com/item?id=15024640), he challenged the commenters disagreeing with him to do these exercises in 24 hours. The tone was pretty abrasive, TBH, but I found the questions interesting enough that I tackled them in earnest.

I posted my solution attempts, so don't scroll down too far if you want to try them on your own ;)