This may be more about functional programming in general, rather than
clojure specific.  However, since I mainly use clojure for learning
functional programming, I would like to discuss it here.

Basically, I can think of the following 2 ways of doing abstraction.
I would like to hear some comments or feedback from others.  Which way
do you think is better?  Does this issue even matter?  Or there are
better alternative ways?  Thanks.


(defn abstract-function [f x y]
        (body....)
        (f x y)
        (body....))

(defn concrete-function [x y]
        (abstract-function a-fun x y))

--------------------------------------------------------------
(defn abstract-function [f]
        (fn [x y]
          (body....)
          (f x y)
          (body....)))

(def concrete-function (abstract-function a-fun))

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