Hi,
I changed println to z/node , this time I'm getting:
NullPointerException clojure.zip/branch? (zip.clj:73)
On Friday, August 21, 2015 at 5:56:10 PM UTC+2, Moe Aboulkheir wrote:
>
> Hussein,
>
> The println inside (recur) will return nil.
>
> Take care,
> Moe
>
> On Fri, Aug 21, 2015 at 4:35 PM, Hussein B. <hubag...@gmail.com
> <javascript:>> wrote:
> > Hi,
> >
> > I have this structure:
> >
> > (def s [{"n" {"id" "a"} "d" 2 "children" [{"n" {"id" "c"} "d" 4
> "children"
> > []}]} {"n" {"id" "b"} "d" 3 "children" []}])
> >
> >
> >
> > And I wrote a function with zippers to traverse it:
> >
> > (defn traverse [col]
> > (loop [z col]
> > (if (= (z/next z) z)
> > z
> > (if (z/branch? z)
> > (recur (z/next z))
> > (recur (-> z println z/next))))))
> >
> >
> > But I'm getting: NullPointerException clojure.zip/next (zip.clj:236)
> >
> > Any ideas?
> >
> > Thanks for help.
> >
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