Re: Why I'm getting NPE with zipper/next?
Hussein,
I don't get an NPE passing that to traverse, but nothing much
interesting happens either. The top-level data structure (and the
vectors within "children") aren't associative, and so don't pass the
branch? test (contains? % "children").
You could certainly extend the zipper to cover both cases, but there
may well be a more compact way to accomplish your goal. What do you
want to do with the piece of data?
Take care,
Moe
On Fri, Aug 21, 2015 at 5:57 PM, Hussein B. wrote:
> Here is my zipper:
>
> (z/zipper #(contains? % "children") #(get % "children") (fn [_ c] c) s)
>
> On Friday, August 21, 2015 at 6:49:25 PM UTC+2, Moe Aboulkheir wrote:
>>
>> Hussein,
>>
>> How are you constructing your zipper, before passing it to traverse?
>> Note that clojure.zip doesn't work on arbitrary data structures
>> without being given some information about how to descend
>> into/construct nodes, etc. - i.e. z/next expects a zipper, and your
>> data structure isn't a zipper, but an input to a zipper. Unless
>> you've written a zipper you omitted from your post, zipping over maps,
>> in particular, may not be as convenient as you're imagining.
>> https://clojuredocs.org/clojure.zip/zipper has helpful examples in it.
>>
>> Take care,
>> Moe
>>
>> On Fri, Aug 21, 2015 at 5:06 PM, Hussein B. wrote:
>> > 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. 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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Re: Why I'm getting NPE with zipper/next?
Here is my zipper:
(z/zipper #(contains? % "children") #(get % "children") (fn [_ c] c) s)
On Friday, August 21, 2015 at 6:49:25 PM UTC+2, Moe Aboulkheir wrote:
>
> Hussein,
>
> How are you constructing your zipper, before passing it to traverse?
> Note that clojure.zip doesn't work on arbitrary data structures
> without being given some information about how to descend
> into/construct nodes, etc. - i.e. z/next expects a zipper, and your
> data structure isn't a zipper, but an input to a zipper. Unless
> you've written a zipper you omitted from your post, zipping over maps,
> in particular, may not be as convenient as you're imagining.
> https://clojuredocs.org/clojure.zip/zipper has helpful examples in it.
>
> Take care,
> Moe
>
> On Fri, Aug 21, 2015 at 5:06 PM, Hussein B. > wrote:
> > 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.
> 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.
> >> >
> >> > --
> >> > You received this message because you are subscribed to the Google
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Re: Why I'm getting NPE with zipper/next?
Hussein,
How are you constructing your zipper, before passing it to traverse?
Note that clojure.zip doesn't work on arbitrary data structures
without being given some information about how to descend
into/construct nodes, etc. - i.e. z/next expects a zipper, and your
data structure isn't a zipper, but an input to a zipper. Unless
you've written a zipper you omitted from your post, zipping over maps,
in particular, may not be as convenient as you're imagining.
https://clojuredocs.org/clojure.zip/zipper has helpful examples in it.
Take care,
Moe
On Fri, Aug 21, 2015 at 5:06 PM, Hussein B. wrote:
> 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. 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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>
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Re: Why I'm getting NPE with zipper/next?
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. > 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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>
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Re: Why I'm getting NPE with zipper/next?
I recall a while ago running into this. I ended up with the following:
(defn stop?
"Returns true if there is no point continuing past the specified loc.
loc may be null or (z/end?).
This is only here because z/up returns nil rather than something (z/end? will
work with)."
[loc]
(or (nil? loc) (z/end? loc)))
and then iterating while not stop?
I also remember running into a situation where loc wasn't nil but z/node
was(!).
I can't recall the exact details but that might help...
Hussein B. writes:
> 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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Re: Why I'm getting NPE with zipper/next?
Hussein,
The println inside (recur) will return nil.
Take care,
Moe
On Fri, Aug 21, 2015 at 4:35 PM, Hussein B. 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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Why I'm getting NPE with zipper/next?
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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Re: How can find something inside heavily nested data structure ?
Yes, that does the job. Thanks for your help and time.
On Thursday, August 20, 2015 at 12:21:47 AM UTC+2, Alan Forrester wrote:
>
> On 19 Aug 2015, at 18:08, Hussein B. >
> wrote:
>
> > Here is more concrete example
> >
> > (def s [{"n" {"id" "a"} "d" 2 "children" [{"n" {"id" "c"} "d" 4
> "children" nil}]} {"n" {"id" "b"} "d" 3 "children" nil}])
> >
> >
> > I want to find the map that has value "c" for "id". If found, I need to
> return the map {"n" {"id" "c"} "d" 4 "children" nil}
>
> One way to do this follows. First get all of the sub-maps, which you can
> do with the following two functions:
>
> (defn get-lower [x] (tree-seq coll? identity x))
>
> (defn get-maps-from-lower [x] (filter map? (get-lower x))).
>
> The first function gets all of the lower level colls, the second picks the
> maps out of those colls.
>
> You then need a function that will rummage round in a coll x looking to
> see if it has the relevant element r:
>
> (defn rummager [x r] (some #(= r %) x))
>
> You then use rummager to get maps with the appropriate val
>
> (defn get-map-with-val [v x]
> (first (filter #(rummager (vals %) v) (get-maps-from-lower x.
>
> Trying this out in the repl I get
>
> => (get-map-with-val {"id" "c"} s)
>
> {"d" 4, "n" {"id" "c"}, "children" nil}
>
> which I believe is the result you wanted.
>
> Alan
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Re: IteratorSequence, dead code?
Deprecated is fine. It can not be sub-classed as it has package-scoped methods. Am rewriting it in Clojure, which is a great exercise for this raw newbie. Thanks! Only I was worried if it is out of date, which it is not looking like for now. On Friday, August 21, 2015 at 8:04:16 AM UTC-4, Alex Miller wrote: > > I would consider IteratorSeq to be deprecated and a candidate for removal, > so subclass at your own risk. > > Alex > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: IteratorSequence, dead code?
Thanks! On Friday, August 21, 2015 at 7:54:04 AM UTC-4, Moe Aboulkheir wrote: > > William, > > https://clojuredocs.org/clojure.core/iterator-seq previously used it, > but as of this commit: > > https://github.com/clojure/clojure/commit/c47e1bbcfa227723df28d1c9e0a6df2bcb0fecc1 > > uses RT/chunkIteratorSeq > > http://dev.clojure.org/jira/browse/CLJ-1669 : "IteratorSeq will no > longer be used but is left in case of regressions for now". > > Take care, > Moe > > On Fri, Aug 21, 2015 at 12:02 PM, William la Forge > wrote: > > Oh! First, let me correct. I'm referring to IteratorSeq in clojure.lang. > The > > constructor is package scoped, so I'll need to copy the code instead of > > subclassing. (Or convert it to Clojure.) So my question really is if the > > code is outdated? Seems to run fine for my limited tests so far. But I > worry > > about using is as a starting point since the code is apparently > > unreferenced. > > > > > > On Friday, August 21, 2015 at 6:37:48 AM UTC-4, William la Forge wrote: > >> > >> I've been using Java class ItreratorSequence in package clojure.lang. > But > >> then I noticed that this class is not referenced anywhere. Is this dead > code > >> or otherwise not supported? I had been planning on subclassing this > code. > > > > -- > > You received this message because you are subscribed to the Google > > Groups "Clojure" group. > > To post to this group, send email to clo...@googlegroups.com > > > Note that posts from new members are moderated - please be patient with > your > > first post. > > To unsubscribe from this group, send email to > > clojure+u...@googlegroups.com > > For more options, visit this group at > > http://groups.google.com/group/clojure?hl=en > > --- > > You received this message because you are subscribed to the Google > Groups > > "Clojure" group. > > To unsubscribe from this group and stop receiving emails from it, send > an > > email to clojure+u...@googlegroups.com . > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[ANN] Release 0.34.0 of Counterclockwise
Counterclockwise, the Eclipse Clojure development tool. Counterclockwise 0.34.0 has been released. Highlights: - Resource hyperlinks: you can Cmd+Clik (or F3) on string literals that represent resources, they will be open. Searches for files relative to the current file, or the classpath, or the project. Also works if the resource is an absolute filesystem path. - Fix an issue with Alt+L L for launching arbitrary Leiningen commands ChangeLog = http://doc.ccw-ide.org/ChangeLog.html#_changes_between_counterclockwise_0_33_0_and_0_34_0 Installation instructions == http://doc.ccw-ide.org/documentation.html#_install_counterclockwise Cheers, -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: IteratorSequence, dead code?
I would consider IteratorSeq to be deprecated and a candidate for removal, so subclass at your own risk. Alex -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: IteratorSequence, dead code?
William, https://clojuredocs.org/clojure.core/iterator-seq previously used it, but as of this commit: https://github.com/clojure/clojure/commit/c47e1bbcfa227723df28d1c9e0a6df2bcb0fecc1 uses RT/chunkIteratorSeq http://dev.clojure.org/jira/browse/CLJ-1669 : "IteratorSeq will no longer be used but is left in case of regressions for now". Take care, Moe On Fri, Aug 21, 2015 at 12:02 PM, William la Forge wrote: > Oh! First, let me correct. I'm referring to IteratorSeq in clojure.lang. The > constructor is package scoped, so I'll need to copy the code instead of > subclassing. (Or convert it to Clojure.) So my question really is if the > code is outdated? Seems to run fine for my limited tests so far. But I worry > about using is as a starting point since the code is apparently > unreferenced. > > > On Friday, August 21, 2015 at 6:37:48 AM UTC-4, William la Forge wrote: >> >> I've been using Java class ItreratorSequence in package clojure.lang. But >> then I noticed that this class is not referenced anywhere. Is this dead code >> or otherwise not supported? I had been planning on subclassing this code. > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with your > first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: IteratorSequence, dead code?
Oh! First, let me correct. I'm referring to IteratorSeq in clojure.lang. The constructor is package scoped, so I'll need to copy the code instead of subclassing. (Or convert it to Clojure.) So my question really is if the code is outdated? Seems to run fine for my limited tests so far. But I worry about using is as a starting point since the code is apparently unreferenced. On Friday, August 21, 2015 at 6:37:48 AM UTC-4, William la Forge wrote: > > I've been using Java class ItreratorSequence in package clojure.lang. But > then I noticed that this class is not referenced anywhere. Is this dead > code or otherwise not supported? I had been planning on subclassing this > code. > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
IteratorSequence, dead code?
I've been using Java class ItreratorSequence in package clojure.lang. But then I noticed that this class is not referenced anywhere. Is this dead code or otherwise not supported? I had been planning on subclassing this code. -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [ANN] New Clojure Book: Clojure Data Structures and Algorithms Cookbook
Hi Rafik, Congratulations, the book looks very interesting - lots of advanced topics there. It's nice to see more diverse books for Clojure, thanks! Cheers, Colin On 20 August 2015 at 13:21, Rafik NACCACHE wrote: > Hi Guys, > > I am proud to let you know that my book dealing about advanced algorithms > in Clojure has hit the shelves. Please head over to: > > > https://www.packtpub.com/application-development/clojure-data-structures-and-algorithms-cookbook > > Rafik > > -- > You received this message because you are subscribed to the Google > Groups "Clojure" group. > To post to this group, send email to clojure@googlegroups.com > Note that posts from new members are moderated - please be patient with > your first post. > To unsubscribe from this group, send email to > clojure+unsubscr...@googlegroups.com > For more options, visit this group at > http://groups.google.com/group/clojure?hl=en > --- > You received this message because you are subscribed to the Google Groups > "Clojure" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups "Clojure" group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
