A cautionary tale: not all TreeSets are equal, but some are more equal than others.pic.twitter.com/mMC4bVJFwe
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That ordering is fishy regardless of TreeSet—I must confess that I was also tempted to do this (in different languages). You want set semantics for the ID, plus associated data, which is the definition of a (Tree)Map.
Yes, agreed. But as my ID is part of my data, I wanted to eliminate the possibility of storing the data against the wrong ID. I can entertain the idea of removing the ID from the data itself, though...
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Or wrap the TreeMap in your own data structure that manifestly always does the right thing.
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Parametricity can help ensuring correctness and will also yield a reusable facility.
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