Comment by AdhemarVandamme

I’m old enough to have used (book) dictionaries and wooden case card catalogues in the local library. So when I learned about hashmaps/IDictonary a quarter century ago, that’s indeed the image that helped me grok the concept.

However, the metaphor isn’t that educationally helpful anymore. On more than one occasion I found myself explaining how card catalogues or even (book) dictionaries work, only to be met with the reply: “oh, so they’re basically analogue hashmaps”.