[pgt]

Example:

    (->> (range 10)  ;; (0 1 2 3 4 5 6 7 8 9)
      (filter even?) ;; (0 2 4 6 8)
      (map inc)      ;; (1 3 5 7 9)
      (apply +))     ;; 25
     => 25

which macroexpands to:

    (apply + (map inc (filter even? (range 10))))