Thanks, i like the "unambiguous intent" argument from your post, and indeed 
i met the stack-overflow issue. 

On Friday, September 9, 2016 at 2:28:46 PM UTC+2, Stuart Sierra wrote:
>
> loop/recur is more typical for this kind of counting loop, as it avoids 
> the risk of a stack-overflow when the number of iterations is high.
>
> Also, I recommend against the [a b & [n]] argument pattern here:
>
> https://stuartsierra.com/2015/06/01/clojure-donts-optional-arguments-with-varargs
>
> –S
>
>
> On Friday, September 9, 2016 at 8:02:14 AM UTC-4, Joeyjoejoe wrote:
>>
>> Hi,
>>
>> I'm just stating to learn clojure, i made a first read of "clojure 
>> programming" to get the big picture, and i'm starting to play with the 
>> repl, trying to solve some katas. A lot of theses katas involves returning 
>> the count of loop iterations. Most of the time, i end up with this kind of 
>> functions:
>>
>> (defn my-function [a b & [n]]
>>  (if cond
>>    (my-function new-a new-b (inc (or n 0))
>>    (or n defaut-value)
>>   )
>> )
>>
>> What are the pros/cons of doing this? Are there any idiomatic ways of 
>> doing this.
>>
>> Thank you
>>
>

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