On Jan 15, 1:21 pm, Nicolas Buduroi <nbudu...@gmail.com> wrote:
> Hi, I'm still not familiar with laziness and I'm trying to make a
> function recursively walk arbitrary data structures to perform some
> action on all strings. The non-lazy version is quite easy to do:
>
> (use
> 'clojure.walk
> 'clojure.contrib.str-utils)
>
> (defn recursive-string-walk [f form]
> (walk #(if (string? %) (f %) (recursive-string-walk f %))
> identity form))
>
> - budu
One more thought (sorry, I'm having too much fun with this
problem)....
I notice that since walk does not traverse anything except collective
data types,
your recursive-string-walk will not call the function f on just a
string argument:
user=> (recursive-string-walk reverse "hello")
"hello"
This, of course, may be exactly the behavior that you desire, but a
version
which handles strings might be useful for a "string walking" function:
(defn rsw [f form]
(if (string? form)
(f form)
(walk (partial rsw f) identity form)
)
)
Unfortunately, this is also non-lazy and will probably still blow your
stack. :)
-tom
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