On Wed, Sep 14, 2011 at 3:58 PM, octopusgrabbus
<octopusgrab...@gmail.com> wrote:
> Alan:
>
> I may have misunderstood what I've read both in books, blogs, and the
> Clojure site, but it seems that writing recursive functions in the loop ..
> recur style is the preferred style. I also remember most of the texts
> currently out on Clojure say use the higher level sequence functions rather
> than recursion. I get it.
>
> I wanted to do this particular exercise without the aid of Clojure.zip.
I would highly recommend using zip for such things, because otherwise
you have to write code like this:
(defn skl [tree]
(loop [[self & todo :as src] [tree], dst [()]]
(cond
(empty? src) dst
(not (coll? self)) (recur todo (first dst))
(empty? self) (recur todo (conj (first dst) (rest dst)))
:else (recur (list* (first self) (rest self) todo) [dst]))))
Jonathan Claggett helped write that. I'm not sure there was ever a
moment where we both understood it simultaneously.
It essentially does what zippers do, but holds the data in a
loop/recur frame rather than a data structure. Any further
explanation is left as an exercise to the reader.
--Chouser
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