Not exactly: my initial acc value is usually something like #{} or [] but
I've got the idea.
On Sunday, December 9, 2012 9:29:25 PM UTC+3, Alan Malloy wrote:
>
> You seem to have written (reduce (fn [acc [a b]] ...) (partition 2 1
> coll)).
>
> On Sunday, December 9, 2012 7:39:21 AM UTC-8, Alexander Semenov wrote:
>>
>> Hi, folks.
>>
>> I'm wondering if Clojure library has 'reduce' function version which is
>> like (reduce f coll) - i.e. it applies function to coll elements without
>> the initial value but at the same time allows to use external accumulator
>> which is passed to f as well. Better look at the code:
>>
>> (defn reduce-with-acc
>> "Applies f to first two coll elements and acc producing new acc value
>> for
>> subsequent f calls. Returns acc. On singleton or empty collection
>> returns
>> acc immediately."
>> [f acc coll]
>> (loop [a (first coll) acc acc s (next coll)]
>> (if (seq s)
>> (let [b (first s)]
>> (recur b (f a b acc) (next s)))
>> acc)))
>>
>> Regards,
>> Alexander.
>>
>
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