Here’s the Deal
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When comparing TommyDS vs Judy Arrays, the Slant community recommends Judy Arrays for most people. In the question“What are the best open-source map/hash-table libraries for C?” Judy Arrays is ranked 2nd while TommyDS is ranked 9th.
Ranked in these QuestionsQuestion Ranking
Pros
Pro Actively developed
TommyDS is actively developed by the creator.
Pro Memory efficient
Pro Very cache-friendly when accessing things in order
Judy is pretty good at inserting and looking up keys in order. This makes Judy probably unbeatably the best when it comes to being cache-friendly.
Cons
Con Poorly formatted documentation
The documentation is poorly organized, and requires some searching before finding what you're looking for. The styling used to display the explanations can be hard on the eyes.