Re: How to change map in doseq ?

[Jiaqi Liu]

Thanks for your suggests~
The above piece of code is just for test.

The practical problem i want to solve is that
-->read a very big log file (each line is like that : "user id, latitude,
longitude, timeStamp")
-->statistic the number of each user (store in a map like that { id1 100 ,
id2 200, id3 150 })
-->sorted the map by values and get the top-N user id

the main code of the former 2 steps is :

(let [ id-num {} ];;as your suggestion , here should use atom
   (with-open [rdr   (the file...)]
  (doseq  [line (line-seq rdr)]
 (let [params(split each line with "," )
id   (params 0)]
   (if  (id-num id)
(do  inc the value )
(do  add new  k-v )
)
...
I don't want to load the total file into memory, too big.
So referencing the suggestion from internet , i am using line-seq & doseq
to deal with the big log file lazily.
Is that right way to use clojue to deal this problem?

Any suggestions will be grateful!!!



2013/10/28 Michael Klishin 

>
> 2013/10/28 Jiaqi Liu 
>
>> i really don't get it.
>> Any suggestion??
>>
>
> Clojure data structures are immutable. clojure.core/assoc
> produces a new data structure instead of changing the one you have.
>
> You can use an atom if you need to update a map from doseq
> but more likely you want to use the actual value assoc returns
> and/or clojure.core functions for manipulating collections,
> such as clojure.core/reduce.
>
> See http://clojure-doc.org/articles/language/core_overview.html,
> http://clojure-doc.org/articles/language/collections_and_sequences.html
> and
> http://clojure-doc.org/articles/language/concurrency_and_parallelism.html
> --
> MK
>
> http://github.com/michaelklishin
> http://twitter.com/michaelklishin
>
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-- 



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Re: ANN: print-foo - a library of print debugging macros

[Alex Baranosky]

I took some inspiration from Tim Baldridge's code-walking macro youtube
video (http://www.youtube.com/watch?v=HXfDK1OYpco) and updated print-foo's
`print-sexp` macro to intelligently expand the code it surrounds.

print.foo=> (print-sexp (str (+ 3 4) (+ 5 (* 6 2)) 4))3 34 4(+ 3 4) 75
56 62 2(* 6 2) 12(+ 5 (* 6 2)) 174 4(str (+ 3 4) (+ 5 (* 6 2)) 4)
"7174"

;; `print-sexp` replaces normal code like ->, ->>, let, cond, if, ;;
etc, where possible with print.foo versions
print.foo=> (pprint (macroexpand '(print-sexp (str (+ 3 4) (-> 5 (* 6)
(* 2)) 4(print.foo/print-and-return
 '(str (+ 3 4) (-> 5 (* 6) (* 2)) 4)
 " "
 (str
  (print.foo/print-and-return
   '(+ 3 4)
   " "
   (+
(print.foo/print-and-return '3 " " 3)
(print.foo/print-and-return '4 " " 4)))
  (print.foo/print-> 5 (* 6) (* 2))
  (print.foo/print-and-return '4 " " 4)))

As of now the latest version is 0.4.2.
https://github.com/AlexBaranosky/print-foo
https://clojars.org/print-foo

Best
Alex


On Thu, Mar 28, 2013 at 12:13 PM, Alex Baranosky <
alexander.barano...@gmail.com> wrote:

> Jim,
>
> No reason I left out loop/recur.  I just didn't get around to it.  Pull
> requests accepted.
>
>
> On Thu, Mar 28, 2013 at 12:07 PM, Alex Baranosky <
> alexander.barano...@gmail.com> wrote:
>
>> adrians,
>>
>> https://clojars.org/print-foo
>>
>> I've got to deploy it with proper signing.
>>
>>
>> On Thu, Mar 28, 2013 at 11:59 AM, adrians  wrote:
>>
>>> Alex, print-foo *is* the correct artifact name, no? It seemed to be
>>> pulled down fine by pomegranate.
>>>
>>>
>>> On Thursday, March 28, 2013 2:35:31 PM UTC-4, Alex Baranosky wrote:

 Let me fix the README, the library should be required like this
 (:require [print.foo :refer :all])

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Fast path to having fun with ClojureScript

[David Nolen]

Given the source map improvements to ClojureScript, now is a good time to
present a newbie friendly guide to hacking with ClojureScript. Emphasis on
no fuss and getting as quickly as possible to productive experimentation:

http://swannodette.github.io/2013/10/27/the-essence-of-clojurescript/

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Re: How to change map in doseq ?

[Michael Klishin]

2013/10/28 Jiaqi Liu 

> i really don't get it.
> Any suggestion??
>

Clojure data structures are immutable. clojure.core/assoc
produces a new data structure instead of changing the one you have.

You can use an atom if you need to update a map from doseq
but more likely you want to use the actual value assoc returns
and/or clojure.core functions for manipulating collections,
such as clojure.core/reduce.

See http://clojure-doc.org/articles/language/core_overview.html,
http://clojure-doc.org/articles/language/collections_and_sequences.html
and
http://clojure-doc.org/articles/language/concurrency_and_parallelism.html
-- 
MK

http://github.com/michaelklishin
http://twitter.com/michaelklishin

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How to change map in doseq ?

[Jiaqi Liu]

Hi , all
I am new to Clojure.
For now , i have a piece of code :
(let [res {}]
 (doseq [id [111 222 333]
 num [2 3 4]]
(assoc res id num))
(count res))
i want to get the res {111 2 , 222 3 , 333 4}  and count 3
but the repl return me  {} and 0
i really don't get it.
Any suggestion??

BR!!




刘家齐 （Jacky Liu）

**

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Re: What non-deprecated Clojure Web libraries to use?

[Paul Samways]

Hi Scott,

I only began Clojure web development recently and decided to use Luminus
[1]; it brings together a bunch of frameworks (lib-nior, ring, compojure,
etc). Felt like a good starting point for me.

Paul.

[1] http://www.luminusweb.net/


On Mon, Oct 28, 2013 at 9:51 AM, James Reeves  wrote:

> Compojure isn't deprecated. What made you think it was?
>
> - James
>
>
> On 27 October 2013 17:43, Scott M  wrote:
>
>> Ring seems well maintained, but Noir and Compojure are marked deprecated.
>>
>> Can anyone lay out a Clojure Web library "stack" (up to templating) that
>> is current and maintained?
>>
>> Any and all sagacious wisdom greatly appreciated - thanks!
>>
>> - Scott
>>
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Re: What non-deprecated Clojure Web libraries to use?

[Paul Samways]

Oh? What are the benefits of using those over Korma? I've been more than
happy with it up to now.


On Mon, Oct 28, 2013 at 10:30 AM, Alexander Hudek wrote:

> http://www.luminusweb.net/ gives a reasonable starting setup. The only
> thing I would recommend doing differently is to use clojure/java.jdbc or
> honeysql instead of korma for an sql dsl.
>
> On Sunday, October 27, 2013 1:43:21 PM UTC-4, Scott M wrote:
>>
>> Ring seems well maintained, but Noir and Compojure are marked deprecated.
>>
>> Can anyone lay out a Clojure Web library "stack" (up to templating) that
>> is current and maintained?
>>
>> Any and all sagacious wisdom greatly appreciated - thanks!
>>
>> - Scott
>>
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Conj Schedule any time soon? EOM

[Alex Miller]

Yes, coming very soon.

Alex

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Re: What non-deprecated Clojure Web libraries to use?

[Christopher Allen]

You can use Korma with Stuart Sierra's workflow just fine.

On Sunday, October 27, 2013 5:07:02 PM UTC-7, Manuel Paccagnella wrote:
>
> Il giorno lunedì 28 ottobre 2013 00:30:06 UTC+1, Alexander Hudek ha 
> scritto:
>
> http://www.luminusweb.net/ gives a reasonable starting setup. The only 
>> thing I would recommend doing differently is to use clojure/java.jdbc or 
>> honeysql instead of korma for an sql dsl.
>>
> I agree. Korma is quite interesting as a DSL, but currently 
> usesVars 
> under the hood to manage connections and this doesn’t play well with 
> dynamic workflows as the 
> oneby 
> Stuart Sierra.
>
> Personally I’ve used just 
> clojure.java.jdbc(
> here  is a micro-tutorial that I’ve 
> written for it) that is going under an API overhaul to make connections 
> management more explicit and functional. If you need an SQL generation 
> library you could look at Honey SQL . 
>
> Hope it helps,
>
> Manuel 
>
> PS: You could also take a look at the new book Web Development in 
> Clojureby the 
> author of 
> Luminus .
>

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Re: What non-deprecated Clojure Web libraries to use?

[Sean Corfield]

I'm using FW/1 (but then it's my framework, ported from CFML :) which
is based on Ring and uses Enlive and Selmer for templating. It uses
conventions rather than configuration (although you can specify routes
if you want to override configuration).

https://github.com/framework-one/fw1-clj

Sean


On Sun, Oct 27, 2013 at 10:43 AM, Scott M  wrote:
> Ring seems well maintained, but Noir and Compojure are marked deprecated.
>
> Can anyone lay out a Clojure Web library "stack" (up to templating) that is
> current and maintained?
>
> Any and all sagacious wisdom greatly appreciated - thanks!
>
> - Scott
>
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-- 
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An Architect's View -- http://corfield.org/
World Singles, LLC. -- http://worldsingles.com/

"Perfection is the enemy of the good."
-- Gustave Flaubert, French realist novelist (1821-1880)

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ANN: ClojureScript 0.0-1978

[David Nolen]

ClojureScript, the Clojure compiler that emits JavaScript source code.

README and source code: https://github.com/clojure/clojurescript

New release version: 0.0-1978

Leiningen dependency information:

[org.clojure/clojurescript "0.0-1978"]

Changes:
* tools.reader 0.7.10

Enhancements:
* Significantly better source map support - should work with or without
Closure optimizations and should work with incremental compilation across
JVM runs. If you haven't tried the source map feature before, now's a good
time :)

Bug fixes:
CLJS-638: Keyword invoke is inconsistent with clojure
CLJS-632: use tools.reader's *alias-map* for tracking aliases instead of
Clojure namespaces
CLJS-471: prevent empty regexps from causing compiler errors
CLJS-628: *cljs-file* not bound when compiling to stdout
CLJS-634: do not call getPath on a null value
CLJS-635: Clojure consistent implementations of -rseq
CLJS-608: Stop re-seq after reaching end of string
CLJS-591: source relative path for source map
CLJS-617: double evaluation of ^not-native type-hinted expressions

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Re: What non-deprecated Clojure Web libraries to use?

[Manuel Paccagnella]

Il giorno lunedì 28 ottobre 2013 00:30:06 UTC+1, Alexander Hudek ha scritto:

http://www.luminusweb.net/ gives a reasonable starting setup. The only 
> thing I would recommend doing differently is to use clojure/java.jdbc or 
> honeysql instead of korma for an sql dsl.
>
I agree. Korma is quite interesting as a DSL, but currently 
usesVars under 
the hood to manage connections and this doesn’t play well with 
dynamic workflows as the 
oneby 
Stuart Sierra.

Personally I’ve used just 
clojure.java.jdbc(
here  is a micro-tutorial that I’ve 
written for it) that is going under an API overhaul to make connections 
management more explicit and functional. If you need an SQL generation 
library you could look at Honey SQL . 

Hope it helps,

Manuel 

PS: You could also take a look at the new book Web Development in 
Clojureby the 
author of 
Luminus .

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Re: What non-deprecated Clojure Web libraries to use?

[Alexander Hudek]

http://www.luminusweb.net/ gives a reasonable starting setup. The only 
thing I would recommend doing differently is to use clojure/java.jdbc or 
honeysql instead of korma for an sql dsl.

On Sunday, October 27, 2013 1:43:21 PM UTC-4, Scott M wrote:
>
> Ring seems well maintained, but Noir and Compojure are marked deprecated.
>
> Can anyone lay out a Clojure Web library "stack" (up to templating) that 
> is current and maintained?
>
> Any and all sagacious wisdom greatly appreciated - thanks! 
>
> - Scott
>

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Re: What non-deprecated Clojure Web libraries to use?

[James Reeves]

Compojure isn't deprecated. What made you think it was?

- James


On 27 October 2013 17:43, Scott M  wrote:

> Ring seems well maintained, but Noir and Compojure are marked deprecated.
>
> Can anyone lay out a Clojure Web library "stack" (up to templating) that
> is current and maintained?
>
> Any and all sagacious wisdom greatly appreciated - thanks!
>
> - Scott
>
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Re: What non-deprecated Clojure Web libraries to use?

[Andy Fingerhut]

Noir is deprecated in favor of lib-noir.

Where have you seen some indication that Compojure is deprecated?

Andy


On Sun, Oct 27, 2013 at 10:43 AM, Scott M  wrote:

> Ring seems well maintained, but Noir and Compojure are marked deprecated.
>
> Can anyone lay out a Clojure Web library "stack" (up to templating) that
> is current and maintained?
>
> Any and all sagacious wisdom greatly appreciated - thanks!
>
> - Scott
>
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What non-deprecated Clojure Web libraries to use?

[Scott M]

Ring seems well maintained, but Noir and Compojure are marked deprecated.

Can anyone lay out a Clojure Web library "stack" (up to templating) that is 
current and maintained?

Any and all sagacious wisdom greatly appreciated - thanks! 

- Scott

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Re: get fn and not-found

[Cedric Greevey]

(get a-map :b my-foo) will result in the function object itself being
returned if :b is not found. If you want it to be called only in the event
of not found, you need either

(if (contains? a-map :b) (a-map :b) (my-foo)) -- which may perform the
lookup twice -- or

(if-let [r (a-map :b)] r (my-foo)) -- which does not, but treats a {:b nil}
entry as the same as absence of :b -- or

(let [sentinel (Object.)
  r (get a-map :b sentinel)]
  (if (identical? r sentinel)
(my-foo)
r)) -- which is longer and more complex, but calls my-foo (and returns
what it returns) if and only if :b is genuinely absent from the map (like
the first solution above) and performs the lookup only once (like the
second solution above). If this has to be done in a tight loop, the extra
efficiency over the second solution may be worth it, but you'll want to
avoid repeatedly creating and discarding the sentinel object as well,
resulting in something like

(def {^:private} sentinel (Object.))

...

(defn ...
...
  (loop ...
...
(let [r (get a-map :b sentinel)]
  (if (identical? r sentinel)
(my-foo)
r)) ... ) ... )



On Sun, Oct 27, 2013 at 1:00 PM, Ryan  wrote:

> Silly me, thank you for your replies guys!
>
> One more question though, what if my-foo had parameters?
>
> Ryan
>
>
> On Sunday, October 27, 2013 6:55:34 PM UTC+2, Luc wrote:
>
>> You are getting my-foo evaluated, remove the parens around it.
>>
>> Luc P.
>>
>>
>> > Hello,
>> >
>> > I am trying to understanding why is this happening:
>> >
>> > > (defn my-foo [] (println "Why do I get printed?"))
>> > > #'sandbox4724/my-foo
>> > > > (get {:b 1} :b (my-foo))
>> > > Why do I get printed?
>> > > 1
>> > > >
>> >
>> >
>> > Shouldn't (my-foo) only be called in case the key isn't found? Why am I
>> > seeing the above behavior instead?
>> >
>> > Thank you for your time,
>> >
>> > Ryan
>> >
>> > --
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Conj Schedule any time soon? EOM

[Tim Visher]

Conj Schedule any time soon? EOM

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Re: get fn and not-found

[Ryan]

Silly me, thank you for your replies guys!

One more question though, what if my-foo had parameters?

Ryan

On Sunday, October 27, 2013 6:55:34 PM UTC+2, Luc wrote:
>
> You are getting my-foo evaluated, remove the parens around it. 
>
> Luc P. 
>
>
> > Hello, 
> > 
> > I am trying to understanding why is this happening: 
> > 
> > > (defn my-foo [] (println "Why do I get printed?")) 
> > > #'sandbox4724/my-foo 
> > > > (get {:b 1} :b (my-foo)) 
> > > Why do I get printed? 
> > > 1 
> > > >   
> > 
> > 
> > Shouldn't (my-foo) only be called in case the key isn't found? Why am I 
> > seeing the above behavior instead? 
> > 
> > Thank you for your time, 
> > 
> > Ryan 
> > 
> > -- 
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Re: get fn and not-found

[Softaddicts]

You are getting my-foo evaluated, remove the parens around it.

Luc P.


> Hello,
> 
> I am trying to understanding why is this happening:
> 
> > (defn my-foo [] (println "Why do I get printed?"))
> > #'sandbox4724/my-foo
> > > (get {:b 1} :b (my-foo))
> > Why do I get printed?
> > 1
> > >  
> 
> 
> Shouldn't (my-foo) only be called in case the key isn't found? Why am I 
> seeing the above behavior instead?
> 
> Thank you for your time,
> 
> Ryan 
> 
> -- 
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Re: get fn and not-found

[dennis zhuang]

The function's arguments will be evaluated before calling it.
So the (my-foo) will be called before 'get'.



2013/10/28 Ryan 

> Hello,
>
> I am trying to understanding why is this happening:
>
> > (defn my-foo [] (println "Why do I get printed?"))
>> #'sandbox4724/my-foo
>> > (get {:b 1} :b (my-foo))
>> Why do I get printed?
>> 1
>> >
>
>
> Shouldn't (my-foo) only be called in case the key isn't found? Why am I
> seeing the above behavior instead?
>
> Thank you for your time,
>
> Ryan
>
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-- 
庄晓丹
Email:killme2...@gmail.com xzhu...@avos.com
Site:   http://fnil.net
Twitter:  @killme2008

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get fn and not-found

[Ryan]

Hello,

I am trying to understanding why is this happening:

> (defn my-foo [] (println "Why do I get printed?"))
> #'sandbox4724/my-foo
> > (get {:b 1} :b (my-foo))
> Why do I get printed?
> 1
> >  


Shouldn't (my-foo) only be called in case the key isn't found? Why am I 
seeing the above behavior instead?

Thank you for your time,

Ryan 

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Re: [ANN] Jig

[Chris Zheng]

Thanks Malcom,

Even something really simple like showing your current project setup would be 
really good for me to get going.

On 21/10/2013, at 15:57, Malcolm Sparks  wrote:

> Hi Chris, yes I will try to do something like that very soon.
> 
> On Friday, October 18, 2013 12:30:20 AM UTC+1, zcaudate wrote:
>> 
>> Would it be possible to put up a video of a typical workflow example with 
>> pedestal. It's quite difficult for me to piece everything together just by 
>> reading the documentation.
>> Chris
>> 
> 
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