function_composition.clj

(defn baz [z]
  ...
  (foobar æ))

(defn bar [y]
  ...
  (baz z))

(defn foo [x]
  ...
  (bar y))

;; vs

(defn baz [z]
  ...
  æ))

(defn bar [y]
  ...
  z))

(defn foo [x]
  ...
  z))

;; This gives
(foobar (baz (bar (foo some-value))))
;; or simply
(-> some-value
    foo
    bar
    baz
    foobar)
;; Now consider in the first example if you want to _not_ call `foobar` but another fn `foobaz`
;; You're in a bunch of pain.