On 11 January 2014 01:14, Alan Forrester
<[email protected]> wrote:
> On 11 January 2014 01:03, Alan Forrester
> <[email protected]> wrote:
>> On 10 January 2014 21:06, Colin Yates <[email protected]> wrote:
>>> Gosh - my public humiliation continues. Here is one that actually works:
>>>
>>> (first (reduce (fn [[results seen] item]
>>> (let [cnt (get seen item 0)]
>>> [(conj results (if (> cnt 0) (format-fn item cnt)
>>> item))
>>> (assoc seen item (inc cnt))]))
>>> [[] {}]
>>> items))
>>> (fact "strings can be made unique"
>>> (s/uniquify ["a" "b" "c"]) => ["a" "b" "c"]
>>> (s/uniquify ["a" "b" "a" "c" "b" "b" "b" "b" "a"]) => ["a" "b" "a_1" "c"
>>> "b_1" "b_2" "b_3" "b_4" "a_2"])
>>
>> My first two suggestions produce unique titles. They don't do what you
>> want but they are brief:
>> (defn uniquify [a] (map #(str (gensym %)) a))
>> (defn uniquify [a] (map-indexed (fn [ind el] (str el "_" ind)) a))
>>
>> My last suggestion does what you want
>> (defn uniquify [a]
>> (loop [res [(first a)] leftover (rest a)]
>> (if-not (empty? leftover)
>> (let [freqy (frequencies res)
>> fl (first leftover)
>> ffl (freqy fl)]
>> (if ffl
>> (recur (concat res [(str fl "_" ffl)]) (rest leftover))
>> (recur (concat res [fl]) (rest leftover))))
>> res)))
>
> Actually, it doesn't work.
This version works:
(defn uniquify [a]
(loop [res [(first a)] intermed [(first a)] leftover (rest a)]
(if-not (empty? leftover)
(let [freqy (frequencies intermed)
fl (first leftover)
ffl (freqy fl)]
(if ffl
(recur (concat res [(str fl "_" ffl)]) (concat intermed
[fl]) (rest leftover))
(recur (concat res [fl]) (concat intermed [fl]) (rest leftover))))
res)))
Alan
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