Another style, using channels for local state, but could been plain old
iterators, slight golf warning:
(require '[clojure.core.async :refer [to-chan <!!]])
(defn uniquify [s formatter]
(let [g (memoize #(to-chan (cons % (map (partial formatter %) (next
(range))))))]
(map (fn f [x] ((some-fn #{x} f) (<!! (g x)))) s)))
(uniquify ["a" "a" "a" "a" "b" "a_2" "a_3" "a_3_1" "a_3_1" "a"] #(str %1
"_" %2))
;=> ["a" "a_1" "a_2" "a_3" "b" "a_2_1" "a_3_1" "a_3_1_1" "a_3_1_2" "a_4"]
On Friday, 10 January 2014 14:59:10 UTC, Colin Yates wrote:
>
> I have a sequence of file names and I want to make them unique. (uniquify
> ["a" "b" "c" "a"]) => ["a" "b" "c" "a_1"])
>
> This is what I have come up with, but surely there is a better way?
>
> What would you all do? Feedback welcome (including the word 'muppet' as I
> am sure I have missed something simple) :)
>
> (defn uniquify
> "Return a sequence, in the same order as s containing every element
> of s. If s (which is presumed to be a string) occurs more than once
> then every subsequent occurrence will be made unique.
>
> Items will be updated to include an incrementing numeric count using
> the specified formatter function. The formatter function will be
> given the name and the number and should return a combination of the
> two.
>
> The set of unique s's in the returned sequence will be the count of
> s's in s."
> ([s] (uniquify s (fn [item duplicates] (str item "_" duplicates))))
> ([s formatter]
> (let [occurrences (atom {})
> register-occurrence (fn [item]
> (if (get @occurrences item)
> (swap! (get @occurrences item) inc)
> (swap! occurrences assoc item (atom 1)))
> @(get @occurrences item))
> process (fn [item]
> (let [duplicates (dec (register-occurrence item))]
> (if (> duplicates 0)
> (formatter item duplicates)
> item)))
> unique-s (map process s)]
> unique-s)))
>
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