Generally speaking, `loop`, `recur`, and writing recursive functions are
not idiomatic in Clojure. Using things like `iterate`, `map`, and `filter`
are considered clearer.
If `n` is used just to count iterations, then `iterate` would be useful.
e.g.
(first (drop n (iterate (fn [[a b]] ... [new-a new-b]))))
If `n` is used in the computation to create new-a and new-b, then `reduce`
and `range` would be useful.
(reduce (fn [[a b] n]
...
[new-a new-b])
[a b]
(range n))
It might be possible to use `map-indexed` with `repeat`, also.
-Jason
On Fri, Sep 9, 2016 at 8:28 AM, Stuart Sierra <the.stuart.sie...@gmail.com>
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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