Hi Base,
It's easy, because instances of defrecord behave identically to maps. Say
you have a lot of "person" records that look like this:
{:first-name "Stuart", :last-name "Sierra", :location "NYC"}
You might write a constructor function to create these maps:
(defn person [& options]
(apply hash-map options))
You use the `person` function to create "person" maps, and you manipulate
them using Clojure's map functions (assoc, dissoc, get, etc.). You can
easily add or remove keys in the map as you develop your application.
Then you want "person" records to be smaller and faster. So you write:
(defrecord Person [first-name last-name location])
(defn person [& options]
(let [{:keys [first-name last-name location]} options]
(Person. first-name last-name location)))
Poof! None of your existing code has to change how it creates and
manipulates "person"s, but all your maps are now records.
-Stuart Sierra
clojure.com
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