If the thing you want to index by is not unique, you could do...
something like:
(def m (atom (sorted-map)))
(def rm (atom (sorted-map)))
(defn add
[k v]
(swap! m assoc k v)
(swap! rm assoc v (conj (get @rm v []) k)))
(add 1 "bbb")
(add 2 "ccc")
(add 3 "aaa")
(add 4 "aaa")
; @rm is now {"aaa" [3 4], "bbb" [1], "ccc" [2]}
This seems simpler to code than a sorted vector index, but would
require more memory. However you can quickly lookup by key or by index
or by range.
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