Good call.
I keep discounting reduce as I am not 'reducing' anything, only
transforming (i.e. map) it - my mistake.
Thanks.
Col
On Friday, 10 January 2014 15:12:27 UTC, Alex Miller wrote:
>
> I would not use an atom. Think about it as doing a reduce while passing
> along a set of the names you've seen so far. You might also look at the
> implementation of "distinct" in clojure.core which is similar (you want to
> detect duplicates in the same way, but emit new names instead of omitting
> dupes).
>
>
> On Friday, January 10, 2014 8:59:10 AM UTC-6, 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)))
>>
>
--
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to clojure@googlegroups.com
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
clojure+unsubscr...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
---
You received this message because you are subscribed to the Google Groups
"Clojure" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to clojure+unsubscr...@googlegroups.com.
For more options, visit https://groups.google.com/groups/opt_out.
