It’s probably fine to do a linear search with .indexOf for small vectors, but
I’ll just say as a matter of style I prefer to use a couple of maps to hold
previous and next items. The maps are callable like functions, which I think
reads very nicely. Using your example data for ranks:
;; helper functions
(defn prev-map [coll] (zipmap (rest coll) coll))
(defn next-map [coll] (zipmap coll (rest coll)))
(def ranks [:private :corporal :sergeant :lieutenant :captain :major :colonel
:general])
(def previous-rank (prev-map ranks))
(def next-rank (next-map ranks))
(next-rank :corporal)
;=> :sergeant
Perhaps, in your example with promotions you'd want the end items to stick
rather than return nil for the overflow cases. (In other situations, you might
want to wrap around.)
(defn bounded-prev-map [coll]
(assoc (zipmap (rest coll) coll) (first coll) (first coll)))
(defn bounded-next-map [coll]
(let [lst (if (vector? coll) (peek coll) (last coll))]
(assoc (zipmap coll (rest coll)) lst lst)))
Just a suggestion.
> On Feb 23, 2015, at 1:44 PM, Daniel Hinojosa <[email protected]>
> wrote:
> This example works, but it still has the feel of a lot of duplication, are
> there any refactorings that I can do to this to make it more concise?
>
> https://github.com/dhinojosa/language-matrix/blob/master/clojure/protocols/protocols.clj
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