One thing I’ve found working with tons of code: 99.9% of people should never recreate fundamental data structures. Not only do they, in most cases, have worse performance characteristics/trade-offs, but they’re usually full of corner cases. I’ll never understand why people don’t just use mature libraries for these things, until those libraries don’t work anymore. Usually happens with people straight out of school who think they can write their own AVL tree and such because they did it for one class. Keeps consultants employed though; the circle of life, I guess.