Late bound parameterization with Specter

late-parameterization-specter.clj

(def DATA {"a" [{"b" 1} {"b" 2}] "b" 11})

;; Selectors that require parameters can be precompiled *without* the parameters.
;; The parameters are supplied later.
(def path (comp-paths keypath ALL keypath))

;; These two selections are equivalent
(select (path "a" "b") DATA)
(select [(keypath "a") ALL (keypath "b")] DATA)

;; This function will now execute extremely efficiently. Before, without late-bound parameterization
;; this would run much slower because of the need to compose the path during the function call. With
;; late-bound parameterization, it's done beforehand and the parameters supplied when they're available.
(defn foo [k1 k2 data]
  (select (path k1 k2) data))