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I am pretty sure that there is a strong overlap between people who use the words "functional programming" and people who use the word "Zettelkasten".

I'm not sure how I know this, I just know. It's like that xkcd about the words that wikipedia really likes.

Has anyone made a Zettelkasten with functional programming?

Let me rephrase. How many such projects exist?

Let me rephrase. How many digits does that number have?

Roam Research, one of the more famous Zettelkasten apps is written in Clojure.