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  • Why explain hashtable? People are coming to this site specifically because they do not want to read and answer algorithmic questions on Stackoverflow :) Commented May 16, 2024 at 1:13
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    This answer boils down to Tell Don't Ask, but the OP is well aware or the principle. The real question is - where is the principle not applicable? Commented May 16, 2024 at 1:19
  • Just for interest, Swift doesn’t have a built-in class “Hashtable”. It has three classes where we would be 99.9% sure that they use a hash table internally: Dictionary (a key/value map), Set (contains keys) and CountedSet (where each key in a Set contains a counter telling us how often it has been added to a set). Commented Aug 8 at 18:26