ichramm · April 28, 2020 13:31
diff --git a/gistfile1.clj b/gistfile1.clj
 ;; Records are just types that provide default implementations of certain
 ;; key interfaces that allow them to stand in for maps.
 ;; This set of interfaces/protocols is not closed though; you can certainly make them
 ;; useful in places where maps aren't, e.g. w/ sequential destructuring:

 => (defrecord Point [x y]
     clojure.lang.Indexed
     (nth [_ i] (case i 0 x 1 y
                  (throw (IndexOutOfBoundsException.))))
     (nth [_ i default]
       (case i 0 x 1 y
         default)))
 user.Point
 => (let [[a b] (Point. 1 2)]
     (+ a b))
 3

 ;; (Further examples can be found in http://clojurebook.com ;-)
 ;; The macro to generalize the above for records that define any number of slots
 ;; is fairly simple, and left as an exercise.
	;; Records are just types that provide default implementations of certain
	;; key interfaces that allow them to stand in for maps.
	;; This set of interfaces/protocols is not closed though; you can certainly make them
	;; useful in places where maps aren't, e.g. w/ sequential destructuring:

	=> (defrecord Point [x y]
	clojure.lang.Indexed
	(nth [_ i] (case i 0 x 1 y
	(throw (IndexOutOfBoundsException.))))
	(nth [_ i default]
	(case i 0 x 1 y
	default)))
	user.Point
	=> (let [[a b] (Point. 1 2)]
	(+ a b))
	3

	;; (Further examples can be found in http://clojurebook.com ;-)
	;; The macro to generalize the above for records that define any number of slots
	;; is fairly simple, and left as an exercise.