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Why are some (many) of Clojure’s built-in functions defined using def, not defn?
I know that defn is a shortcut for def, but I’m wondering if there’s some other reason such as efficiency/readability/style considerations/bootstrapping.
Read further down in clojure/core.clj –
defndoesn’t exist yet at the top, because that file is building the language as it goes. After several hundred lines,defnis written, and functions after that are defined withdefn.