Lazy sequences (once again?)

[Edward Knyshov]

Hi I recently started to dig into lazy sequences processing in clojure 
because I need to process huge amount of data that doesn't fit in memory.
I found a few articles and examples describing the way lazy seqs work in 
clojure. But so far all I got myself is a paranoia.
Now everywhere I look in the code I have a feeling that it's gonna retain 
my sequence in memory.
It seems like realization of lazy clojure sequences is very unclear 
sometimes and you can't reason about it.

For example:

(let [r (range 1e9)] 
   (first r) 
   (last r)) 
;;=> 9 

(let [r (range 1e9)] 
   (last r) 
   (first r)) 
;;=> java.lang.OutOfMemoryError: GC overhead limit exceeded

I got this example from here 
https://github.com/danielmiladinov/joy-of-clojure/blob/master/src/joy-of-clojure/chapter6/laziness.clj
I tried it myself and it works as it's commented above.
But how in the world does it work internally?
How can I reason about this code in more complex example where instead of 
function first there is some function x and instead of function last there 
is some function y.
I can't come up with some clear rule of thumb that would help me to be 
confident that my code works well on lazy collections without running it 
and checking whether it throws OOME or not..
I would appreciate if anyone could point me to any discussion/article/paper 
that makes things more clear?

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Re: Port graphs: What would Rich Hickey do?

[James Gatannah]

On Thursday, January 4, 2018 at 5:51:27 PM UTC-6, Ben Kovitz wrote:
>
>
> Well! So far, Specter appears to have taken the "path map" idea that I'd 
> been toying with to its ultimate logical conclusion—far better than I could 
> ever do it. Nathan Marz even says that needing to manipulate tricky graphs 
> "forced" him to come up with Specter. If I understand it correctly, Specter 
> would even allow me to map these peculiar port graphs to simplicial graphs 
> without adding any performance overhead.
>
> It looks like I'd need to write a custom navigator or two. I haven't yet 
> found a good tutorial for getting beyond the most elementary concepts of 
> Specter, though. Can you recommend one?
>

FWIW, I think https://leanpub.com/specter looks extremely interesting. (Or 
it may be awful...I haven't had a chance to read it yet, much less work 
through the exercises).

Regards,
James


> --
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> http://pages.iu.edu/~bkovitz/
>
>

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Re: [ANN] Git Deps for Clojure!

[Alex Miller]

On Sun, Jan 7, 2018 at 6:53 PM, Nathan Fisher 
wrote:


> I strongly agree with your decision of “pick the latest”. While I do
> understand multiple active versions can make it easier for a developer I
> don’t think that’s the “right” decision. Besides I can only imagine how
> much of a pain it would be to implement reliably. I’d expect if I specify a
> patched version of struts that a transitive dependency wouldn’t have the
> ability to override that for its own purpose.
>

I guess I didn't mention that top-level deps always win, so if desired you
are always able to decide the specific version in your project.

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Re: [ANN] Git Deps for Clojure!

[Nathan Fisher]

Hi Alex,

Sounds great!

I strongly agree with your decision of “pick the latest”. While I do
understand multiple active versions can make it easier for a developer I
don’t think that’s the “right” decision. Besides I can only imagine how
much of a pain it would be to implement reliably. I’d expect if I specify a
patched version of struts that a transitive dependency wouldn’t have the
ability to override that for its own purpose.

Cheers,
Nathan

On Sun, 7 Jan 2018 at 20:51, Alex Miller  wrote:

>
> On Sunday, January 7, 2018 at 3:41:34 PM UTC-6, Nathan Fisher wrote:
>>
>>
>> Not sure I would want to see duplicates either. If my code breaks because
>> of an old dependency I’d rather that than make the false assumption that
>> I’m running securely with the latest version of a lib.
>>
>
> Encountering duplicate libs in the transitive tree is common to almost
> every dependency trees (for example, it's typical to see multiple versions
> of Clojure as a dependency in *every* transitive tree). clj, like every
> other dependency tool, will continue to make choices about which version to
> include and tools to control which one is included.
>
> I do plan to add better tools to understand the tree and the choices made.
>
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Re: [ANN] Git Deps for Clojure!

[Alex Miller]

On Sunday, January 7, 2018 at 5:45:22 PM UTC-6, Alan Thompson wrote:
>
> Hey - I love the idea.  However, I'm getting an error message trying to 
> run the example:
>
> ~/work/fred > cat deps.edn 
> {:deps
>  {github-clj-time/clj-time
>   {:git/url "https://github.com/clj-time/clj-time; :rev "cce58248"}}
> } 
> 
>
> ~/work/fred > clj
> Error building classpath. Manifest type :lein not loaded when finding deps 
> for github-clj-time/clj-time in coordinate {:git/url "
> https://github.com/clj-time/clj-time;, :rev 
> "cce58248937bc05452ebfc8b65134961227a554e", *:deps/manifest :lein*, 
> :deps/root 
> "/home/alan/.gitlibs/libs/github-clj-time/clj-time/cce58248937bc05452ebfc8b65134961227a554e"}
>
>
>
Once a dependency has been downloaded, deps must read a project manifest to 
understand its dependencies. Currently, only deps.edn manifests are 
supported. It's currently autodetecting the lein project.clj but does not 
have a reader for it. I have already changed the error handling here so 
this presents differently, but that has not yet been released. Eventually I 
expect we will have readers for poms and project.clj files, etc.

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Re: [ANN] Git Deps for Clojure!

[Alex Miller]

On Sunday, January 7, 2018 at 3:41:34 PM UTC-6, Nathan Fisher wrote:
>
>
> Not sure I would want to see duplicates either. If my code breaks because 
> of an old dependency I’d rather that than make the false assumption that 
> I’m running securely with the latest version of a lib.
>

Encountering duplicate libs in the transitive tree is common to almost 
every dependency trees (for example, it's typical to see multiple versions 
of Clojure as a dependency in *every* transitive tree). clj, like every 
other dependency tool, will continue to make choices about which version to 
include and tools to control which one is included.

I do plan to add better tools to understand the tree and the choices made.

>

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Re: [ANN] Git Deps for Clojure!

[Alan Thompson]

Hey - I love the idea.  However, I'm getting an error message trying to run
the example:

~/work/fred > cat deps.edn
{:deps
 {github-clj-time/clj-time
  {:git/url "https://github.com/clj-time/clj-time; :rev "cce58248"}}
}


~/work/fred > clj
Error building classpath. Manifest type :lein not loaded when finding deps
for github-clj-time/clj-time in coordinate {:git/url "
https://github.com/clj-time/clj-time;, :rev
"cce58248937bc05452ebfc8b65134961227a554e", *:deps/manifest :lein*,
:deps/root
"/home/alan/.gitlibs/libs/github-clj-time/clj-time/cce58248937bc05452ebfc8b65134961227a554e"}


​Any pointers on where I'm going wrong?
Alan


On Sun, Jan 7, 2018 at 1:43 PM, Nathan Fisher 
wrote:

> Im probably not typical for this but I really value the ability to
> override the location of where they’re placed. I actually commit my deps to
> SCM for production code. The internet is fast enough these days that i
> don’t care about a common code cache. I’m more interested in a reproducible
> build.
>
> On Sat, 6 Jan 2018 at 11:25, Alex Miller  wrote:
>
>>
>>
>> > On Jan 6, 2018, at 5:43 AM, Khalid Jebbari 
>> wrote:
>> >
>> > Great news, great work ! Soon running Clojure will be dead easy.
>> >
>> > 2 questions :
>> > - where do dependencies get downloaded ? `~/.m2` ? It depends on the
>> procurer (mvn/git/etc.)
>>
>> It depends. Maven deps go to .m2, git deps go to .gitlibs.
>>
>> > - does it work for Cljs ? What does it mean for Cljs ?
>>
>> This is targeted at launching Clojure programs. ClojureScript itself is a
>> Clojure program, so it’s relevant in that sense.
>>
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Re: [ANN] Git Deps for Clojure!

[Alex Miller]

On Sunday, January 7, 2018 at 2:37:33 PM UTC-6, Daniel Compton wrote:
>
> > git deps go to .gitlibs.
>
> Would you consider not putting them in the root of the user's home 
> directory? All the major OS's (and probably the minor ones too) have 
> dedicated folders to put caches. I've opened 
> https://dev.clojure.org/jira/browse/TDEPS-30 with more details on this.
>
>
Will continue discussion on ticket rather than here...

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Re: Clojure spec generate and instrument in cascade

[Azzabi Ahmed]

I came across that library that one is generating specs from sample data, but 
what I want is, if I have specs for a function foo is there a library to 
generate specs for bar that's called from foo. 

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Re: [ANN] Git Deps for Clojure!

[Nathan Fisher]

Im probably not typical for this but I really value the ability to override
the location of where they’re placed. I actually commit my deps to SCM for
production code. The internet is fast enough these days that i don’t care
about a common code cache. I’m more interested in a reproducible build.

On Sat, 6 Jan 2018 at 11:25, Alex Miller  wrote:

>
>
> > On Jan 6, 2018, at 5:43 AM, Khalid Jebbari 
> wrote:
> >
> > Great news, great work ! Soon running Clojure will be dead easy.
> >
> > 2 questions :
> > - where do dependencies get downloaded ? `~/.m2` ? It depends on the
> procurer (mvn/git/etc.)
>
> It depends. Maven deps go to .m2, git deps go to .gitlibs.
>
> > - does it work for Cljs ? What does it mean for Cljs ?
>
> This is targeted at launching Clojure programs. ClojureScript itself is a
> Clojure program, so it’s relevant in that sense.
>
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Re: Clojure spec generate and instrument in cascade

[Gary Verhaegen]

A Google search for "clojure spec generate" turned up this for me on
the first page of results:
https://github.com/stathissideris/spec-provider

It may or may not fit your use-case, but scanning through the README
it seems at least related to what you're looking for.

On 7 January 2018 at 18:25, Azzabi Ahmed  wrote:
> Hi all, so usually I structure my application as black box, that takes some 
> input and gives output, I usually validate inputs before starting with them 
> in my system boundaries, which I think clojure spec is good for since it also 
> allows to document what my application accept or expect. Now my question is 
> there a library that allows to deduct/infer specs then I call instrument to 
> validate that following called methods respect the specs.
>
> Example
>
> If I have function foo that takes some input that I already wrote specs for, 
> then foo will call bar with some part of the input. Is their a lib to infer 
> bar specs based on foo specs and calls ? Also that then I can instrument and 
> check if all code calls are consistent ?

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Re: [ANN] Git Deps for Clojure!

[Nathan Fisher]

Great work Alex!

Not sure I would want to see duplicates either. If my code breaks because
of an old dependency I’d rather that than make the false assumption that
I’m running securely with the latest version of a lib.

On Fri, 5 Jan 2018 at 16:20, Gary Trakhman  wrote:

> Congrats on the release! It's exciting to see this vision move forward.
> Wondering if the logical next step is the npm style of trees of duplicate
> transitive git deps.  In general, how is this going to work for transitive
> deps?
>
> On Fri, Jan 5, 2018 at 1:49 PM Alex Miller  wrote:
>
>> Pleased to announce some new functionality for clj and tools.deps!
>>
>> https://clojure.org/news/2018/01/05/git-deps
>>
>> Additionally, there have been new releases of:
>> - Brew clojure formula (to get it: brew upgrade clojure)
>> - Linux clojure installer (see https://clojure.org/guides/getting_started
>> for info)
>> - tools.deps.alpha 
>> - NEW tools.gitlibs 
>>
>> Other than git deps, "clj -Spom" for pom generation has some fixes and an
>> addition to add Maven repositories if needed.
>>
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Re: [ANN] Git Deps for Clojure!

[Daniel Compton]

> git deps go to .gitlibs.

Would you consider not putting them in the root of the user's home
directory? All the major OS's (and probably the minor ones too) have
dedicated folders to put caches. I've opened
https://dev.clojure.org/jira/browse/TDEPS-30 with more details on this.

--
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On Sun, Jan 7, 2018 at 3:25 AM Alex Miller  wrote:

>
>
> > On Jan 6, 2018, at 5:43 AM, Khalid Jebbari 
> wrote:
> >
> > Great news, great work ! Soon running Clojure will be dead easy.
> >
> > 2 questions :
> > - where do dependencies get downloaded ? `~/.m2` ? It depends on the
> procurer (mvn/git/etc.)
>
> It depends. Maven deps go to .m2, git deps go to .gitlibs.
>
> > - does it work for Cljs ? What does it mean for Cljs ?
>
> This is targeted at launching Clojure programs. ClojureScript itself is a
> Clojure program, so it’s relevant in that sense.
>
> --
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Clojure spec generate and instrument in cascade

[Azzabi Ahmed]

Hi all, so usually I structure my application as black box, that takes some 
input and gives output, I usually validate inputs before starting with them in 
my system boundaries, which I think clojure spec is good for since it also 
allows to document what my application accept or expect. Now my question is 
there a library that allows to deduct/infer specs then I call instrument to 
validate that following called methods respect the specs. 

Example

If I have function foo that takes some input that I already wrote specs for, 
then foo will call bar with some part of the input. Is their a lib to infer bar 
specs based on foo specs and calls ? Also that then I can instrument and check 
if all code calls are consistent ? 

Thanks

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Re: [JOB] Telia Norge needs people interested in working with Clojure and ClojureScript (Oslo, Norway)

[Jakub Holý]

Clarification: the job unfortunately requires physical presence in Oslo,
Norway.
fre. 5. jan. 2018 kl. 12.18 skrev Jakub Holý :

> Hello! We here at Telia Norge are starting a new project using Clojure and
> ClojureScript and need people that know or are interested in learning and
> using these technologies.
>
> So if you could consider becoming our employee and joining the team, let
> us know as soon as possible (you don't need to be decided yet, interest is
> enough).
>
> We need to verify the viability of hiring employees to work with these
> technologies pretty soon to be able to go forward with the project. So if
> you are interested, let us know by January 12th! (The deadline for
> expressing interest might be extended but it isn't guaranteed. However
> hiring will go on for quite a while.)
>
> Let me know at jakub.h...@telia.no if you are interested!
>
> (PS: You can read some more about this at our blog
> http://techblog.telia.no/)
>
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