I mean, the lesson I got from my 10X class was pretty much that: "never write your own math library, unless you're working on maintaining one yourself". funnil

I mean, the lesson I got from my 10X class was pretty much that: "never write your own math library, unless you're working on maintaining one yourself". funnily enough, this wasn't limited to contributing to some popular OS initiative. You can call YAGNI, but many companies do in fact have their own libraries to maintain internally. So it comes up more than you expect. On a higher level, the time I took to implement a bunch of sorts helped me be able to read the docs for sort(), realize it's a quicksort implentation, and make judgements like 1. yeah, that works 2. this is overkill for my small dataset, I'll just whip up basic bubblesort 3. oh, there's multiple sort API's and some sorts are in-place. I'll use this one 4. This is an important operation and I need a more robust sorting library. I'll explain it to the team with XYZ The reasoning was the important lesson, not the ability to know what sorting is.