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What are some cool and obscure data structure you know of?
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this post was submitted on 01 Jan 2026
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I personally don't think it's that obscure but I have never seen this used in production code that I didn't write: the linked hash map or ordered hash map.
I've used it twice that I can recall.
@idunnololz @protein what's the goal of an ordered hashmap?
Having a fixed iteration order, but an amortized O(1) access time.
For example if you have a map of uuids to players in a game, and want to use the same map for doing operations to all of them in the order they joined.