I have some confusion about how the function `comp` works, especially as
compared to the threading macro `->>`.
>From the book *Clojure Programming* (pages 70-71 of Chapter 2: Functional
Programming), the following two functions are described as functionally
equivalent:

    (def camel->keyword
      (comp keyword
            str/join
            (partial interpose \-)
            (partial map str/lower-case)
            #(str/split % #"(?<=[a-z])(?=[A-Z])")))

    (defn camel->keyword*
      [s]
      (->> (str/split s #"(?<=[a-z])(?=[A-Z])")
           (map str/lower-case)
           (interpose \-)
           str/join
           keyword))

Why does the first function, `camel->keyword`, need to use `partial` with 
the
`map` and `interpose` functions? The second function, `camel->keyword*`, 
does
not need to use `partial`.

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