from:"Dennis"

Hi , i am pleased to introduce defun https://github.com/killme2008/defun:
a beautiful macro to define clojure functions with pattern match.

Some examples:


(defun say-hi

  ([:dennis] Hi,good morning, dennis.)

  ([:catty] Hi, catty, what time is it?)

  ([:green] Hi,green, what a good day!)

  ([other] (str Say hi to  other)))


(say-hi :dennis)

;;  Hi,good morning, dennis.

(say-hi :catty)

;;  Hi, catty, what time is it?

(say-hi :green)

;;  Hi,green, what a good day!

(say-hi someone)

;;  Say hi to someone


Recursive function? It's all right:

(defun count-down

  ([0] (println Reach zero!))

  ([n] (println n)

 (recur (dec n

(defun fib

([0] 0)

([1] 1)

([n] (+ (fib (- n 1)) (fib (- n 2)



Guard functions? it's all right:

(defun valid-geopoint?

([(_ :guard #(and ( % -180) ( % 180)))

  (_ :guard #(and ( % -90) ( % 90)))] true)

([_ _] false))


(valid-geopoint? 30 30)

;; true

(valid-geopoint? -181 30)

;; false


It's really cool,all the magic are from core.match, much more details
please see
https://github.com/killme2008/defun


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Re: {ANN} defun: A beautiful macro to define clojure functions with pattern match.

Released 0.1.0-RC,  defun collect :arglists metadata, another recursive
function example:

 (defun accum
  ([0 ret] ret)
  ([n ret] (recur (dec n) (+ n ret)))
  ([n] (recur n 0)))

 (accum 100) ;; the result is 5050


2014-09-14 14:46 GMT+08:00 dennis zhuang killme2...@gmail.com:


 Hi , i am pleased to introduce defun https://github.com/killme2008/defun:
 a beautiful macro to define clojure functions with pattern match.

 Some examples:


 (defun say-hi

   ([:dennis] Hi,good morning, dennis.)

   ([:catty] Hi, catty, what time is it?)

   ([:green] Hi,green, what a good day!)

   ([other] (str Say hi to  other)))


 (say-hi :dennis)

 ;;  Hi,good morning, dennis.

 (say-hi :catty)

 ;;  Hi, catty, what time is it?

 (say-hi :green)

 ;;  Hi,green, what a good day!

 (say-hi someone)

 ;;  Say hi to someone


 Recursive function? It's all right:

 (defun count-down

   ([0] (println Reach zero!))

   ([n] (println n)

  (recur (dec n

 (defun fib

 ([0] 0)

 ([1] 1)

 ([n] (+ (fib (- n 1)) (fib (- n 2)



 Guard functions? it's all right:

 (defun valid-geopoint?

 ([(_ :guard #(and ( % -180) ( % 180)))

   (_ :guard #(and ( % -90) ( % 90)))] true)

 ([_ _] false))


 (valid-geopoint? 30 30)

 ;; true

 (valid-geopoint? -181 30)

 ;; false


 It's really cool,all the magic are from core.match, much more details
 please see
 https://github.com/killme2008/defun


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 Email:killme2...@gmail.com xzhu...@avos.com
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Re: {ANN} defun: A beautiful macro to define clojure functions with pattern match.

Hi Herwig

Actually,defun just define a variadic arguments function,so it doesn't have
different arities. And when using defun macro ,it walk through the body
forms, find 'recur'  forms and replace them with (recur (vector
...arguments)) instead.

A macroexpand-1 result of accum:


(macroexpand-1

  '(defun accum

  ([0 ret] ret)

  ([n ret] (recur (dec n) (+ n ret)))

  ([n] (recur n 0

=


(clojure.core/defn

 accum

 {:arglists '([0 ret] [n ret] [n])}

 [ args__4602__auto__]

 (clojure.core.match/match

  [(clojure.core/vec args__4602__auto__)]

  [[0 ret]]

  (do ret)

  [[n ret]]

  (do (recur (vector (dec n) (+ n ret

  [[n]]

  (do (recur (vector n 0)


The core procedure is at
https://github.com/killme2008/defun/blob/master/src/defun.clj#L97-107



2014-09-15 0:15 GMT+08:00 Herwig Hochleitner hhochleit...@gmail.com:

 Hi Dennis,

 marrying core.match to defn is a pretty neat idea. Thanks for releasing it!

 I see that you actually extended defn in that you made it possible to
 recur between different arities.
 Can you give a quick rundown on how you made that work? Are the arities
 still separate IFn arities? Does it still run in constant stack space?

 kind regards

 PS @adrian: If you feel like Friendly advice ing someone, why not do so
 in a private email?

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Re: {ANN} defun: A beautiful macro to define clojure functions with pattern match.

And of course ,it still run in constant stack space just like normal recur
form.

P.S. I think adrian's advice is good, please forgive my poor english,and i
changes the description to ' a macro to define clojure functions with
pattern match just like erlang or elixir.

2014-09-15 0:26 GMT+08:00 dennis zhuang killme2...@gmail.com:

 Hi Herwig

 Actually,defun just define a variadic arguments function,so it doesn't
 have different arities. And when using defun macro ,it walk through the
 body forms, find 'recur'  forms and replace them with (recur (vector
 ...arguments)) instead.

 A macroexpand-1 result of accum:


 (macroexpand-1

   '(defun accum

   ([0 ret] ret)

   ([n ret] (recur (dec n) (+ n ret)))

   ([n] (recur n 0

 =


 (clojure.core/defn

  accum

  {:arglists '([0 ret] [n ret] [n])}

  [ args__4602__auto__]

  (clojure.core.match/match

   [(clojure.core/vec args__4602__auto__)]

   [[0 ret]]

   (do ret)

   [[n ret]]

   (do (recur (vector (dec n) (+ n ret

   [[n]]

   (do (recur (vector n 0)


 The core procedure is at
 https://github.com/killme2008/defun/blob/master/src/defun.clj#L97-107



 2014-09-15 0:15 GMT+08:00 Herwig Hochleitner hhochleit...@gmail.com:

 Hi Dennis,

 marrying core.match to defn is a pretty neat idea. Thanks for releasing
 it!

 I see that you actually extended defn in that you made it possible to
 recur between different arities.
 Can you give a quick rundown on how you made that work? Are the arities
 still separate IFn arities? Does it still run in constant stack space?

 kind regards

 PS @adrian: If you feel like Friendly advice ing someone, why not do so
 in a private email?

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Re: [ANN] Clojure 1.7.0-alpha2

2014-09-11 Thread dennis zhuang

May be the LongAdder in Java8 can beat AtomicLong :D

http://blog.palominolabs.com/2014/02/10/java-8-performance-improvements-longadder-vs-atomiclong/

2014-09-11 17:30 GMT+08:00 Linus Ericsson oscarlinuserics...@gmail.com:

 The volatile construct seems very useful in some particular cases! I have
 been missing ugly-mutable variables for things such as certain types of
 heaps/queues or write-intensive, slightly probabilistic stuff where one
 missed write doesn't matter that much.

 For people who don't have a Java background, I just want to point the very
 useful package java.util.concurrent.atomic, in which one can find gems such
 as AtomicLong, which is almost unbeatable as a counter.

 An example in which an AtomicLong is about three times quicker than an
 atom:

 https://gist.github.com/claj/6711556#file-countertest-clj

 Javadoc for AtomicLong:


 http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/atomic/AtomicLong.html

 In the sake of completeness,
 Linus

 2014-09-11 11:06 GMT+02:00 Frantisek Sodomka fsodo...@gmail.com:

 Using my timings macro:
 https://gist.github.com/fsodomka/5890711

 I am getting that:
 - creation  derefing is 60% faster
 - swapping is 25% faster
 - resetting is about the same


 ;; volatile vs. atom ;;

 (report
   (timings 1e7
 (deref (volatile! 42))
 (deref (atom 42

 ; |  :expr | :time | :ratio | :perc |
 ; |+---++---|
 ; | (deref (volatile! 42)) | 30.688238 |1.0 | 39.81 |
 ; |  (deref (atom 42)) | 77.081141 |   2.51 | 100.0 |


 (report
   (let [v (volatile! 42)
 a (atom 42)]
 (timings 1e7
   (vswap! v inc)
   (swap! a inc

 ; |  :expr |  :time | :ratio | :perc |
 ; |+++---|
 ; | (vswap! v inc) | 136.052946 |1.0 | 75.08 |
 ; |  (swap! a inc) | 181.218748 |   1.33 | 100.0 |


 (report
   (let [v (volatile! 42)
 a (atom 42)]
 (timings 1e7
   (vreset! v 10)
   (reset! a 10

 ; |  :expr | :time | :ratio | :perc |
 ; |+---++---|
 ; |  (reset! a 10) | 98.755318 |1.0 | 96.69 |
 ; | (vreset! v 10) | 102.13944 |   1.03 | 100.0 |




 On Thursday, September 11, 2014 6:18:08 AM UTC+2, puzzler wrote:

 I'm curious: how much faster are volatiles than atoms?

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Re: Clojure production environment

2014-08-20 Thread dennis zhuang

jetty + lein jar + lein libdir，and used fabric to deploy applications.Uses
nginx as load balancer.



2014-08-20 16:55 GMT+08:00 Max Penet m...@qbits.cc:

 For web stuff we use jetty (9) apps as uberjar, behind nginx, deployed
 and CC via ansible, hosted on DigitalOcean as well.
 Ansible is super easy to get started with and can grow to complicated
 setups relatively painlessly, can't say enough good things about it.

 On Wednesday, August 20, 2014 10:40:15 AM UTC+2, Bruce Durling wrote:

 Embedded jetty or httpkit + uberjar running behind nginx running
 behind elastic load balancer on aws.

 On Wed, Aug 20, 2014 at 9:37 AM, Michael Klishin
 michael@gmail.com wrote:
  On 20 August 2014 at 11:52:51, Serzh Nechyporchuk (nechyp...@gmail.com)
 wrote:
   I want to ask what environments for production do you use (e.g.
  application server, cloud platform, deploy tool, etc)?
  I think this information will be interesting for many people.
  For now in our project we use Jetty server on Digital Ocean droplet.
  We deploy by copying war file generated by lein ring uberwar.
 
  Jetty + lein uberjar is by far the most popular option from what I see.
 
  You can deploy with Chef/Puppet/etc, run on Heroku or Cloud Foundry, or
 even
  use very basic SSH commands or Capistrano to deploy.
  --
  @michaelklishin, github.com/michaelklishin
 
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Re: Supplied-p parameter in clojure similar to lisp lambda lists

2014-08-18 Thread dennis zhuang

I created a ticket http://dev.clojure.org/jira/browse/CLJ-1508


2014-08-18 11:02 GMT+08:00 dennis zhuang killme2...@gmail.com:

 I think that adding a :p option to destructuring would be great:

 (let [ {:keys [a b c] :p {a a-p}} params]
 (if a-p
 (println a)
 (println a is not exists.)))






 2014-08-17 20:05 GMT+08:00 Dave Tenny dave.te...@gmail.com:

 Well, it took me a while to perhaps get what you were telling me here.

 In my case I I had something like

 (defn foo [  {:keys [bar ... more keys ...] :or {bar 1}} ] ...)

 and I wanted to know whether the user had explicilty invoked foo with
 :bar.

 What wasn't clear to me was that :as solved this problem.
 Reading http://clojure.org/special_forms#Special Forms--Binding Forms
 (Destructuring)-Map binding destructuring
 I guess I can see that it's telling me :as shows things that weren't in
 the init-form, but that's with hindsight.

 So, to emulated common lisp 'supplied-p' semantics, you can check the :as
 form, which will **not**
 contain :or values for keywords.

 E.g.

 user (defn bar [  {:keys [baz] :or {baz 'baz} :as all-keys} ] (println
 baz all-keys))
 #'user/bar
 user (bar :bof 1)
 baz {:bof 1}
 nil

 And not that the all-keys form does not show a binding for baz, and
 that's what I wanted.

 Just fyi in case anybody searches topics for 'supplied-p' again.


 On Saturday, June 21, 2014 7:22:13 PM UTC-4, Jason Felice wrote:

 If you destructure the parameters like this:
 (defn f [ {:as a-map}] ...)

 You can use map primitives on a-map.  But you can also supply defaults
 here.
  On Jun 20, 2014 2:14 PM, Dave Tenny dave@gmail.com wrote:

  What is the commonly accepted technique for declaring/using
 'supplied-p' type lambda list functionality in clojure?

 http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/
 HyperSpec/Body/sec_3-4-1.html


 I have some clojure functions with a large number of keywords and
 various defaults, I want to know if a keyword was specified by the caller
 (rather than defaulted) in some cases.

 Certainly I could implement my own destructuring macros that did this,
 but I'd like to avoid reinventing a wheel here if I can, and also to know
 the idiomatic clojure way to do it.

 Thanks for any tips.


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Re: Supplied-p parameter in clojure similar to lisp lambda lists

2014-08-18 Thread dennis zhuang

Yep, it's an optional syntax sugar.
Indeed, you should use (contains? all-keys :baz) to check if :baz is
present in options. If :baz is present but it's value is nil,then (:baz
all-keys) returns nil too.


2014-08-18 18:57 GMT+08:00 Dave Tenny dave.te...@gmail.com:

 I don't think that a :p feature is necessary, since all you need to do to
 emulate it is a
 (:baz all-keys) to know if the user explicitly specified it.  I.e. I think
 the capability is already present in adequate form but the documentation on
 map destructuring could be improved.




 On Sun, Aug 17, 2014 at 11:02 PM, dennis zhuang killme2...@gmail.com
 wrote:

 I think that adding a :p option to destructuring would be great:

 (let [ {:keys [a b c] :p {a a-p}} params]
 (if a-p
 (println a)
 (println a is not exists.)))






 2014-08-17 20:05 GMT+08:00 Dave Tenny dave.te...@gmail.com:

  Well, it took me a while to perhaps get what you were telling me here.

 In my case I I had something like

 (defn foo [  {:keys [bar ... more keys ...] :or {bar 1}} ] ...)

 and I wanted to know whether the user had explicilty invoked foo with
 :bar.

 What wasn't clear to me was that :as solved this problem.
 Reading http://clojure.org/special_forms#Special Forms--Binding Forms
 (Destructuring)-Map binding destructuring
 I guess I can see that it's telling me :as shows things that weren't in
 the init-form, but that's with hindsight.

 So, to emulated common lisp 'supplied-p' semantics, you can check the
 :as form, which will **not**
 contain :or values for keywords.

 E.g.

 user (defn bar [  {:keys [baz] :or {baz 'baz} :as all-keys} ] (println
 baz all-keys))
 #'user/bar
 user (bar :bof 1)
 baz {:bof 1}
 nil

 And not that the all-keys form does not show a binding for baz, and
 that's what I wanted.

 Just fyi in case anybody searches topics for 'supplied-p' again.


 On Saturday, June 21, 2014 7:22:13 PM UTC-4, Jason Felice wrote:

 If you destructure the parameters like this:
 (defn f [ {:as a-map}] ...)

 You can use map primitives on a-map.  But you can also supply defaults
 here.
  On Jun 20, 2014 2:14 PM, Dave Tenny dave@gmail.com wrote:

  What is the commonly accepted technique for declaring/using
 'supplied-p' type lambda list functionality in clojure?

 http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/
 HyperSpec/Body/sec_3-4-1.html


 I have some clojure functions with a large number of keywords and
 various defaults, I want to know if a keyword was specified by the caller
 (rather than defaulted) in some cases.

 Certainly I could implement my own destructuring macros that did this,
 but I'd like to avoid reinventing a wheel here if I can, and also to know
 the idiomatic clojure way to do it.

 Thanks for any tips.


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Re: Supplied-p parameter in clojure similar to lisp lambda lists

2014-08-17 Thread dennis zhuang

I think that adding a :p option to destructuring would be great:

(let [ {:keys [a b c] :p {a a-p}} params]
(if a-p
(println a)
(println a is not exists.)))






2014-08-17 20:05 GMT+08:00 Dave Tenny dave.te...@gmail.com:

 Well, it took me a while to perhaps get what you were telling me here.

 In my case I I had something like

 (defn foo [  {:keys [bar ... more keys ...] :or {bar 1}} ] ...)

 and I wanted to know whether the user had explicilty invoked foo with :bar.

 What wasn't clear to me was that :as solved this problem.
 Reading http://clojure.org/special_forms#Special Forms--Binding Forms
 (Destructuring)-Map binding destructuring
 I guess I can see that it's telling me :as shows things that weren't in
 the init-form, but that's with hindsight.

 So, to emulated common lisp 'supplied-p' semantics, you can check the :as
 form, which will **not**
 contain :or values for keywords.

 E.g.

 user (defn bar [  {:keys [baz] :or {baz 'baz} :as all-keys} ] (println
 baz all-keys))
 #'user/bar
 user (bar :bof 1)
 baz {:bof 1}
 nil

 And not that the all-keys form does not show a binding for baz, and that's
 what I wanted.

 Just fyi in case anybody searches topics for 'supplied-p' again.


 On Saturday, June 21, 2014 7:22:13 PM UTC-4, Jason Felice wrote:

 If you destructure the parameters like this:
 (defn f [ {:as a-map}] ...)

 You can use map primitives on a-map.  But you can also supply defaults
 here.
  On Jun 20, 2014 2:14 PM, Dave Tenny dave@gmail.com wrote:

  What is the commonly accepted technique for declaring/using
 'supplied-p' type lambda list functionality in clojure?

 http://www.ai.mit.edu/projects/iiip/doc/CommonLISP/
 HyperSpec/Body/sec_3-4-1.html


 I have some clojure functions with a large number of keywords and
 various defaults, I want to know if a keyword was specified by the caller
 (rather than defaulted) in some cases.

 Certainly I could implement my own destructuring macros that did this,
 but I'd like to avoid reinventing a wheel here if I can, and also to know
 the idiomatic clojure way to do it.

 Thanks for any tips.


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CtorReader bug?

2014-08-16 Thread dennis zhuang

user= #java.lang.String[hello world]
hello world

user= #java.lang.String[(byte-array) utf8]
IllegalArgumentException No matching ctor found for class java.lang.String
 clojure.lang.Reflector.invokeConstructor (Reflector.java:183)

It seems that the CtorReader
https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/LispReader.java#L1187-1245
doesn't eval the arguments before invoking constructor,so it can't find a
valid ctor.

I am not sure whether it's a bug or an expected behaviour.


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Re: CtorReader bug?

2014-08-16 Thread dennis zhuang

Sorry,the error example must be:

user= #java.lang.String[(byte-array 10) utf8]
IllegalArgumentException No matching ctor found for class java.lang.String
 clojure.lang.Reflector.invokeConstructor (Reflector.java:183)



2014-08-16 19:59 GMT+08:00 dennis zhuang killme2...@gmail.com:

 user= #java.lang.String[hello world]
 hello world

 user= #java.lang.String[(byte-array) utf8]
 IllegalArgumentException No matching ctor found for class java.lang.String
  clojure.lang.Reflector.invokeConstructor (Reflector.java:183)

 It seems that the CtorReader
 https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/LispReader.java#L1187-1245
 doesn't eval the arguments before invoking constructor,so it can't find a
 valid ctor.

 I am not sure whether it's a bug or an expected behaviour.


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Re: CtorReader bug?

2014-08-16 Thread dennis zhuang

Got it.

Thanks for your quick reply.


2014-08-16 20:14 GMT+08:00 Nicola Mometto brobro...@gmail.com:

 It's by design, see the section on ctor literals
 http://clojure.org/reader#toc1

 The elements in the vector part are passed unevaluated to the relevant
 constructor.

 Nicola

 dennis zhuang writes:

  user= #java.lang.String[hello world]
  hello world
 
  user= #java.lang.String[(byte-array) utf8]
  IllegalArgumentException No matching ctor found for class
 java.lang.String
   clojure.lang.Reflector.invokeConstructor (Reflector.java:183)
 
  It seems that the CtorReader
  
 https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/LispReader.java#L1187-1245
 
  doesn't eval the arguments before invoking constructor,so it can't find a
  valid ctor.
 
  I am not sure whether it's a bug or an expected behaviour.
 
 
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{ANN} clj.qrgen and securen-rand : generate QRCode and secure random in clojure

2014-06-22 Thread dennis zhuang

*clj.qrgen*:  https://github.com/killme2008/clj.qrgen

Generate QRCode  in clojure:

(as-file (from hello world))

*secure-rand*:  https://github.com/killme2008/secure-rand

Secure version for clojure.core/rand etc.

(ns test
  (:refer-clojure :exclude [rand rand-int rand-nth])
  (:use [secure-rand.core :only [rand rand-int rand-nth]]))
(rand)(rand 10)(rand-int 100)(rand-nth (range 10))


Hope they could be helpful for someone.
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Re: Effective Clojure book?

2014-06-04 Thread dennis zhuang

《The joy of clojure》 ?


2014-06-05 9:30 GMT+08:00 Mike Fikes mikefi...@me.com:

 Are there any books yet that prescribe best practices for Clojure, à la
 Meyers or Bloch?

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{{ANN} clj-xmemcached release 0.2.4

2014-04-27 Thread dennis zhuang

An opensource memcached client for clojure,it wraps xmemcached.

0.2.4 releases, main highlights:

   - Upgrade xmemcached to
2.0.0https://github.com/killme2008/xmemcached/releases/tag/xmemcached-2.0.0,
   10% performance improved for text protocol and fixed some issues.
   - Added nippy-transcoder to support
nippyhttps://github.com/ptaoussanis/nippyserialization.
   - Added expiration time parameters for incr/decr functions.
   - Added :session-locator option for memcached function to use special
   
MemcachedSessionLocatorhttp://fnil.net/docs/xmemcached/net/rubyeye/xmemcached/MemcachedSessionLocator.html
   .

Manual and home:  https://github.com/killme2008/clj-xmemcached

Thanks.

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Re: [ANN] core.rrb-vector 0.0.11 -- Clojure 1.6 compatibility and bug fixes

2014-03-30 Thread dennis zhuang

I can't find any performance benchmark in the home page.Any links?Thanks.



2014-03-31 2:01 GMT+08:00 Michał Marczyk michal.marc...@gmail.com:

 Hi,

 I am pleased to announce the 0.0.11 release of core.rrb-vector, a
 Clojure Contrib library extending the Clojure vector API with
 logarithmic-time concatenation and slicing:

   https://github.com/clojure/core.rrb-vector

   [org.clojure/core.rrb-vector 0.0.11]

   dependency
 groupIdorg.clojure/groupId
 artifactIdcore.rrb-vector/artifactId
 version${version}/version
   /dependency

   compile org.clojure:core.rrb-vector:${version}

 This release updates the hashing mechanism used by RRB vectors for
 compatibility with Clojure 1.6 (while maintaining compatibility with
 1.5.1) and fixes two bugs. Additionally, the README now states that
 view vectors produced by clojure.core/subvec are handled correctly in
 Clojure = 1.6.0.

 Many thanks to the two new contributors: Jozef Wagner, who reported
 and fixed a bug to do with transient vectors of primitives and who
 reported a bug in sequences over RRB vectors that would surface when
 using such sequences with the reducers library; and Andy Fingerhut,
 who kept on top of the hashing changes and contributed improvements to
 the test suite, which now explicitly checks both hash codes (hasheq
 and hashCode).

 Cheers,
 Michał

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Re: shenandoah

2014-03-13 Thread Dennis Haupt

i also did an asteroid game in clojure. i don't think you can ever achieve
the performance of hackedyhack-mutablility with pure functional algorithms
- my approach to get the best performance while staying as clean as
possible would be to keep two copies of the game world, using one as source
data and generating the next version into the other, and vice versa.
similar to double buffering.
as long as you can guarantee that objects in the working copy are just
data that is not referenced anywhere, you can pretend that an initAll
method on an object is nothing else than a fully working constructor - just
that the object you initialize is initially filled with random data instead
of not yet existing.
you can pretend it's new, and pretend your algorithms are functional^^


2014-03-13 0:19 GMT+01:00 Jacob Goodson submissionfight...@gmx.com:

 Let me state that, as long as it is a asteroids clone, it is fine.
 However, compared to Java, the performance was much worse(when just playing
 with it and drawing tons of asteroids in opengl).  Also, I do not know what
 you mean when you say that you have tested it... the

 pure way or the mutate objects in place way?  I can get great performance
 with clojure, no doubt about it, by violating the shat out of functional
 programming.  I can not get great performance with the beautiful, pure,
 composable, clojure that I desire!  I have seen many game

 examples in clojure where, basically, clojure is just a scripting
 language that wraps java.  It is no problem if this is the case, my
 question has jack crap to do about getting good performance writing
 asteroids.  My question is: Will clojure(the immutable composable side)

 benefit from shenandoah(blasted font) at all?  Can someone who knows a
 good bit about clojure tell me if a more powerful garbage collector would
 allow us clojurians to be more pure or is it something else inherently in
 immutable land that will never(it will take a long time) get fixed.


 On Wednesday, March 12, 2014 6:53:43 PM UTC-4, James Reeves wrote:

 I've done a fair bit of experimentation with writing games in Clojure,
 and I haven't noticed any major performance issues. If you're getting
 issues on a 2D asteroids clone, I suspect there might be something
 inefficient in your code. I find Criterium useful for benchmarking parts of
 my code in isolation to get an idea of how its running.

 - James


 On 12 March 2014 21:53, Jacob Goodson submissio...@gmx.com wrote:

 How many people have heard of this GC?  http://www.jclarity.com/2014/
 02/19/shenandoah-a-new-low-pause-garbage-collection-
 algorithm-for-the-java-hotspot-jvm/

 I want to know if this would benefit clojure.  I wrote a small asteroids
 game in clojure and the performance was not good.  I stuck to purity when
 writing the game, only mutating my data after it had passed through a
 bazillion pure functions.  I was wondering, would a GC like this one(or
 Azul's) make a significant impact so that I, or others, could make games in
 a more pure fashion?  I WANT MY EFFIN PURITY!

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Re: Do I have to have knowlegde about Lisp

2014-03-10 Thread Dennis Haupt

you can learn clojure without learning lisp first :)


2014-03-10 15:41 GMT+01:00 Roelof Wobben rwob...@hotmail.com:

 Hello,

 I like the idea of Clojure but I wonder if I have to know a lot of Lisp to
 work with Clojure.

 What is the best way to go from a absolute beginner to someone who can
 work with Clojure.

 Roelof

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Re: Clojure performance question

The String a=i+another word; is also compiled into using
 StringBuilder, see the byte code by javap -v:

   Code:
  stack=5, locals=5, args_size=1
 0: invokestatic  #2  // Method
java/lang/System.nanoTime:()J
 3: lstore_1
 4: iconst_0
 5: istore_3
 6: iload_3
 7: ldc   #3  // int 1000
 9: if_icmpge 39
12: new   #4  // class
java/lang/StringBuilder
15: dup
16: invokespecial #5  // Method
java/lang/StringBuilder.init:()V
19: iload_3
20: invokevirtual #6  // Method
java/lang/StringBuilder.append:(I)Ljava/lang/StringBuilder;
23: ldc   #7  // String another word
25: invokevirtual #8  // Method
java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
28: invokevirtual #9  // Method
java/lang/StringBuilder.toString:()Ljava/lang/String;
31: astore4
33: iinc  3, 1
36: goto  6
39: getstatic #10 // Field
java/lang/System.out:Ljava/io/PrintStream;
42: invokestatic  #2  // Method
java/lang/System.nanoTime:()J
45: lload_1
46: lsub
47: l2d
48: ldc2_w#11 // double 1.0E9d
51: ddiv
52: invokevirtual #13 // Method
java/io/PrintStream.println:(D)V


I think the performance hotspot in this simple example is the object
allocate/gc  and function calling overhead.The str function create
an anonymous function every time to concat argument strings:

(^String [x  ys]
 ((fn [^StringBuilder sb more]
  (if more
(recur (. sb  (append (str (first more (next more))
(str sb)))
  (new StringBuilder (str x)) ys)))

And we all know that a function in clojure is a java object allocated in
heap.And another overhead is calling the function,it's virtual method.

By watching the gc statistics using 'jstat -gcutil pid 2000', i found
that the clojure sample ran about 670 minor gc,but the java sample is only
120 minor gc.

A improved clojure version,it's performance is closed to java sample:

user= (time (dotimes [n 1000] (- (StringBuilder.) (.append n)
(.append another word) (.toString
Elapsed time: 1009.942 msecs




2014-03-01 18:02 GMT+08:00 bob wee@gmail.com:

 Case :

 clojure verison:

 (time (dotimes [n 1000] (str n another word))) ;; take about 5000msec

 java version

 long time = System.nanoTime();

 for(int i=0 ; i1000 ;i++){
 String a=i+another word;
 }
   System.out.println(System.nanoTime()-time);


 The java version take about 500 msecs, I thought it might be caused by the
 str implementation which is using string builder, and it might not be the
 best choice in the case of no much string to concat, and then I replace
 another word with 5 long strings as the parameter, however no surprise.

 I just wonder what make the difference, or how to find the difference.

 Thanks



 On Saturday, March 1, 2014 1:26:38 PM UTC+8, Shantanu Kumar wrote:

 I have seen (and I keep seeing) a ton of Java code that performs poorly.
 Empirically, it's equally easy to write a slow Java app. You always need a
 discerning programmer to get good performance from any language/tool.

 Numbers like 1/4 or 1/10 can be better discussed in presence of the
 use-cases and perf test cases. Most of the problems you listed can be
 mitigated by `-server` JIT, avoiding reflection, transients, loop-recur,
 arrays, perf libraries and some Java code.

 Shantanu

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Site:   http://fnil.net
Twitter:  @killme2008

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You

Re: Clojure performance question

I forgot to note hat i test the java sample and clojure sample code with
the same jvm options '-server'.



2014-03-01 20:03 GMT+08:00 dennis zhuang killme2...@gmail.com:

 The String a=i+another word; is also compiled into using
  StringBuilder, see the byte code by javap -v:

Code:
   stack=5, locals=5, args_size=1
  0: invokestatic  #2  // Method
 java/lang/System.nanoTime:()J
  3: lstore_1
  4: iconst_0
  5: istore_3
  6: iload_3
  7: ldc   #3  // int 1000
  9: if_icmpge 39
 12: new   #4  // class
 java/lang/StringBuilder
 15: dup
 16: invokespecial #5  // Method
 java/lang/StringBuilder.init:()V
 19: iload_3
 20: invokevirtual #6  // Method
 java/lang/StringBuilder.append:(I)Ljava/lang/StringBuilder;
 23: ldc   #7  // String another word
 25: invokevirtual #8  // Method
 java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
 28: invokevirtual #9  // Method
 java/lang/StringBuilder.toString:()Ljava/lang/String;
 31: astore4
 33: iinc  3, 1
 36: goto  6
 39: getstatic #10 // Field
 java/lang/System.out:Ljava/io/PrintStream;
 42: invokestatic  #2  // Method
 java/lang/System.nanoTime:()J
 45: lload_1
 46: lsub
 47: l2d
 48: ldc2_w#11 // double 1.0E9d
 51: ddiv
 52: invokevirtual #13 // Method
 java/io/PrintStream.println:(D)V


 I think the performance hotspot in this simple example is the object
 allocate/gc  and function calling overhead.The str function create
 an anonymous function every time to concat argument strings:

 (^String [x  ys]
  ((fn [^StringBuilder sb more]
   (if more
 (recur (. sb  (append (str (first more (next more))
 (str sb)))
   (new StringBuilder (str x)) ys)))

 And we all know that a function in clojure is a java object allocated in
 heap.And another overhead is calling the function,it's virtual method.

 By watching the gc statistics using 'jstat -gcutil pid 2000', i found
 that the clojure sample ran about 670 minor gc,but the java sample is only
 120 minor gc.

 A improved clojure version,it's performance is closed to java sample:

 user= (time (dotimes [n 1000] (- (StringBuilder.) (.append n)
 (.append another word) (.toString
 Elapsed time: 1009.942 msecs




 2014-03-01 18:02 GMT+08:00 bob wee@gmail.com:

 Case :

 clojure verison:

 (time (dotimes [n 1000] (str n another word))) ;; take about
 5000msec

 java version

 long time = System.nanoTime();

 for(int i=0 ; i1000 ;i++){
 String a=i+another word;
 }
   System.out.println(System.nanoTime()-time);


 The java version take about 500 msecs, I thought it might be caused by
 the str implementation which is using string builder, and it might not be
 the best choice in the case of no much string to concat, and then I replace
 another word with 5 long strings as the parameter, however no surprise.

 I just wonder what make the difference, or how to find the difference.

 Thanks



 On Saturday, March 1, 2014 1:26:38 PM UTC+8, Shantanu Kumar wrote:

 I have seen (and I keep seeing) a ton of Java code that performs poorly.
 Empirically, it's equally easy to write a slow Java app. You always need a
 discerning programmer to get good performance from any language/tool.

 Numbers like 1/4 or 1/10 can be better discussed in presence of the
 use-cases and perf test cases. Most of the problems you listed can be
 mitigated by `-server` JIT, avoiding reflection, transients, loop-recur,
 arrays, perf libraries and some Java code.

 Shantanu

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 --
 庄晓丹
 Email:killme2...@gmail.com xzhu...@avos.com
 Site:   http://fnil.net
 Twitter:  @killme2008





-- 
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Email:killme2...@gmail.com xzhu...@avos.com
Site:   http://fnil.net
Twitter:  @killme2008

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Re: Clojure performance question

I think the remaining overhead of clojure sample code is that operators in
java such as '++' and ' etc.They are just an instrument of JVM -- iinc
and if_icmpge. But they are both functions in clojure,and they will be
called by invokevirtual instrument.It cost much more performance.




2014-03-01 20:07 GMT+08:00 dennis zhuang killme2...@gmail.com:

 I forgot to note hat i test the java sample and clojure sample code with
 the same jvm options '-server'.



 2014-03-01 20:03 GMT+08:00 dennis zhuang killme2...@gmail.com:

 The String a=i+another word; is also compiled into using
  StringBuilder, see the byte code by javap -v:

Code:
   stack=5, locals=5, args_size=1
  0: invokestatic  #2  // Method
 java/lang/System.nanoTime:()J
  3: lstore_1
  4: iconst_0
  5: istore_3
  6: iload_3
  7: ldc   #3  // int 1000
  9: if_icmpge 39
 12: new   #4  // class
 java/lang/StringBuilder
 15: dup
 16: invokespecial #5  // Method
 java/lang/StringBuilder.init:()V
 19: iload_3
 20: invokevirtual #6  // Method
 java/lang/StringBuilder.append:(I)Ljava/lang/StringBuilder;
 23: ldc   #7  // String another word
 25: invokevirtual #8  // Method
 java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
 28: invokevirtual #9  // Method
 java/lang/StringBuilder.toString:()Ljava/lang/String;
 31: astore4
 33: iinc  3, 1
 36: goto  6
 39: getstatic #10 // Field
 java/lang/System.out:Ljava/io/PrintStream;
 42: invokestatic  #2  // Method
 java/lang/System.nanoTime:()J
 45: lload_1
 46: lsub
 47: l2d
 48: ldc2_w#11 // double 1.0E9d
 51: ddiv
 52: invokevirtual #13 // Method
 java/io/PrintStream.println:(D)V


 I think the performance hotspot in this simple example is the object
 allocate/gc  and function calling overhead.The str function create
 an anonymous function every time to concat argument strings:

 (^String [x  ys]
  ((fn [^StringBuilder sb more]
   (if more
 (recur (. sb  (append (str (first more (next more))
 (str sb)))
   (new StringBuilder (str x)) ys)))

 And we all know that a function in clojure is a java object allocated in
 heap.And another overhead is calling the function,it's virtual method.

 By watching the gc statistics using 'jstat -gcutil pid 2000', i found
 that the clojure sample ran about 670 minor gc,but the java sample is only
 120 minor gc.

 A improved clojure version,it's performance is closed to java sample:

 user= (time (dotimes [n 1000] (- (StringBuilder.) (.append n)
 (.append another word) (.toString
 Elapsed time: 1009.942 msecs




 2014-03-01 18:02 GMT+08:00 bob wee@gmail.com:

 Case :

 clojure verison:

 (time (dotimes [n 1000] (str n another word))) ;; take about
 5000msec

 java version

 long time = System.nanoTime();

 for(int i=0 ; i1000 ;i++){
 String a=i+another word;
 }
   System.out.println(System.nanoTime()-time);


 The java version take about 500 msecs, I thought it might be caused by
 the str implementation which is using string builder, and it might not be
 the best choice in the case of no much string to concat, and then I replace
 another word with 5 long strings as the parameter, however no surprise.

 I just wonder what make the difference, or how to find the difference.

 Thanks



 On Saturday, March 1, 2014 1:26:38 PM UTC+8, Shantanu Kumar wrote:

 I have seen (and I keep seeing) a ton of Java code that performs
 poorly. Empirically, it's equally easy to write a slow Java app. You always
 need a discerning programmer to get good performance from any 
 language/tool.

 Numbers like 1/4 or 1/10 can be better discussed in presence of the
 use-cases and perf test cases. Most of the problems you listed can be
 mitigated by `-server` JIT, avoiding reflection, transients, loop-recur,
 arrays, perf libraries and some Java code.

 Shantanu

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Re: Clojure performance question

Yep, you are right, inspecting the byte code generated by the clojure code:

 (loop [n 0]
(when ( n 1000)
  (- (StringBuilder.) (.append n) (.append another word)
(.toString))
  (recur (unchecked-inc n

It is:


L4
LINENUMBER 4 L4
LLOAD 1
LDC 1000
LCMP
IFGE L5
   L6
LINENUMBER 5 L6
   L7
LINENUMBER 5 L7
   L8
LINENUMBER 5 L8
NEW java/lang/StringBuilder
DUP
INVOKESPECIAL java/lang/StringBuilder.init ()V
CHECKCAST java/lang/StringBuilder
LLOAD 1
INVOKEVIRTUAL java/lang/StringBuilder.append
(J)Ljava/lang/StringBuilder;
CHECKCAST java/lang/StringBuilder
LDC another word
CHECKCAST java/lang/String
INVOKEVIRTUAL java/lang/StringBuilder.append
(Ljava/lang/String;)Ljava/lang/StringBuilder;
CHECKCAST java/lang/StringBuilder
INVOKEVIRTUAL java/lang/StringBuilder.toString ()Ljava/lang/String;
POP
   L9
LINENUMBER 6 L9
LLOAD 1
LCONST_1
LADD
LSTORE 1
GOTO L2
GOTO L10
   L11
POP
   L5
ACONST_NULL


It's almost the same with java compiled byte code,except using long type's
instruments (LCMP and LADD etc) and some CHECKCAST (cast type) instruments.





2014-03-01 21:00 GMT+08:00 Jozef Wagner jozef.wag...@gmail.com:

 Clojure math functions compile down to the same JVM 'instruction' as from
 java. See http://galdolber.tumblr.com/post/77153377251/clojure-intrinsics



 On Sat, Mar 1, 2014 at 1:23 PM, dennis zhuang killme2...@gmail.comwrote:

 I think the remaining overhead of clojure sample code is that operators
 in java such as '++' and ' etc.They are just an instrument of JVM -- iinc
 and if_icmpge. But they are both functions in clojure,and they will be
 called by invokevirtual instrument.It cost much more performance.




 2014-03-01 20:07 GMT+08:00 dennis zhuang killme2...@gmail.com:

 I forgot to note hat i test the java sample and clojure sample code with
 the same jvm options '-server'.



 2014-03-01 20:03 GMT+08:00 dennis zhuang killme2...@gmail.com:

 The String a=i+another word; is also compiled into using
  StringBuilder, see the byte code by javap -v:

Code:
   stack=5, locals=5, args_size=1
  0: invokestatic  #2  // Method
 java/lang/System.nanoTime:()J
  3: lstore_1
  4: iconst_0
  5: istore_3
  6: iload_3
  7: ldc   #3  // int 1000
  9: if_icmpge 39
 12: new   #4  // class
 java/lang/StringBuilder
 15: dup
 16: invokespecial #5  // Method
 java/lang/StringBuilder.init:()V
 19: iload_3
 20: invokevirtual #6  // Method
 java/lang/StringBuilder.append:(I)Ljava/lang/StringBuilder;
 23: ldc   #7  // String another word
 25: invokevirtual #8  // Method
 java/lang/StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
 28: invokevirtual #9  // Method
 java/lang/StringBuilder.toString:()Ljava/lang/String;
 31: astore4
 33: iinc  3, 1
 36: goto  6
 39: getstatic #10 // Field
 java/lang/System.out:Ljava/io/PrintStream;
 42: invokestatic  #2  // Method
 java/lang/System.nanoTime:()J
 45: lload_1
 46: lsub
 47: l2d
 48: ldc2_w#11 // double 1.0E9d
 51: ddiv
 52: invokevirtual #13 // Method
 java/io/PrintStream.println:(D)V


 I think the performance hotspot in this simple example is the object
 allocate/gc  and function calling overhead.The str function create
 an anonymous function every time to concat argument strings:

 (^String [x  ys]
  ((fn [^StringBuilder sb more]
   (if more
 (recur (. sb  (append (str (first more (next more))
 (str sb)))
   (new StringBuilder (str x)) ys)))

 And we all know that a function in clojure is a java object allocated
 in heap.And another overhead is calling the function,it's virtual method.

 By watching the gc statistics using 'jstat -gcutil pid 2000', i found
 that the clojure sample ran about 670 minor gc,but the java sample is only
 120 minor gc.

 A improved clojure version,it's performance is closed to java sample:

 user= (time (dotimes [n 1000] (- (StringBuilder.) (.append n)
 (.append another word) (.toString
 Elapsed time: 1009.942 msecs




 2014-03-01 18:02 GMT+08:00 bob wee@gmail.com:

 Case :

 clojure verison:

 (time (dotimes [n 1000] (str n another word))) ;; take about
 5000msec

 java version

 long time = System.nanoTime();

 for(int i=0 ; i1000 ;i++){
 String a=i+another word;
 }
   System.out.println(System.nanoTime()-time);


 The java version take about 500 msecs, I thought it might be caused by
 the str implementation

Re: JRE/JVM for development

2014-01-29 Thread Dennis Haupt

my vm starts up within a second or so, what's the problem for you?


2014-01-29 ton...@gmail.com

 Are there any Java VMs strictly for development use that could be started
 up quicker, use less memory or compile clojure during execution?
 Alternatively can OpenJDK or similar be configured to do so? I don't care
 about application performance during development.

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Re: equality

2014-01-27 Thread Dennis Haupt

one does not simply compare floating point numbers for equality


2014-01-27 Eric Le Goff eleg...@gmail.com

 Newbie question :

 user= (= 42 42)
 true
 user= (= 42 42.0)
 false

 I did not expect last result.

 I understand that underlying classes are not the same
 i.e
 user= (class 42)
 java.lang.Long
 user= (class 42.0)
 java.lang.Double


 but anyway I'am surprised

 Cheers


 --
 Eric

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Re: JAVA_OPTS not accessible in my Clojure project

2014-01-12 Thread dennis zhuang

Tried System/getenv ?


2014/1/12 aidy lewis aidy.le...@gmail.com

 Hi Phil,

 M-x cider-jack-in, but the JAVA_OPT properties are also nil if I do a lein
 run.

 Thanks

 Aidy


 On 12 January 2014 05:25, Matching Socks phill.w...@gmail.com wrote:

 How did you start the Emacs Cider REPL?

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Re: How to indent clojure code in Emacs

2014-01-03 Thread dennis zhuang

use the 'indent-region' function.You can define a function to indent the
whole buffer:

(defun indent-buffer ()
  Indent whole buffer
  (interactive)
  (indent-region (point-min) (point-max))
  (message format successfully))


Then bind the function to a key, i bound it to F7 for me:

(global-set-key [f7] 'indent-buffer)

Also, you can indent-buffer before saving file:

(defun indent-file-when-save ()
  indent file when save.
  (make-local-variable 'after-save-hook)
  (add-hook 'after-save-hook
(lambda ()
  (if (buffer-file-name)
  (indent-buffer))
  (save-buffer
(add-hook 'clojure-mode-hook 'indent-file-when-save)



2014/1/3 tao tao.zhou2...@gmail.com

  https://github.com/clojure-emacs/clojure-mode

 I have installed this plugin, but I don’t know how to indent clojure code,
 when I already selected a region. In Vim, I can do this using “=“, just a
 simple key stroke.

 This a problem when I copy some clojure code from other place, not typed
 in.

 I already read this tutorial (
 http://www.unexpected-vortices.com/clojure/10-minute-emacs-for-clojure.html),
 but I cannot found the method.

 sorry for disturb. :)

 --
 tao
 Sent with Sparrow http://www.sparrowmailapp.com/?sig

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Re: Read Microsoft Word .doc files in Clojure

2014-01-02 Thread Dennis Haupt

use apache poi and write a small wrapper or something
this is what i did


2014/1/2 Joshua Mendoza joshua.m...@gmail.com

 Hi!,

 I've been looking for libraries or resources to read MS .doc files in
 Clojure, but found none. Does anyone have tried, used, encountered or
 witnessed such a thing to read them?

 I found a lot of info publicly available by the government in .doc files
 but I want to process them automatically with Clojure.

 The closest thing I know is using Incanter but to read XLS files, which is
 not useful at all for this...

 Well, any help would be great.

 Thank you!

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some clojure experience

2013-12-31 Thread Dennis Haupt

i solved a few little thingy with clojure now, including some euler
problems, java interop and an asteroids clone.

my summary would be:
* very nice to write +1. i used clojure's collections for a lot of things,
and they made a good impression
* you need to plan far ahead compared to java. in java, it's easy to
hack-fix something if it doesn't work by adding a field somewhere and
read its value later, or add a parameter to a call hierarchy. i know this
isn't the way it should be done, but sometimes code quality is irrelevant
(for example if you are just making some experiments)
* the effort to modify code is either very low, or very high - in java, it
was kind of always the same. in clojure, it seems to depend a lot on the
existing code.
* debugging is impossible (or very hard) if you want to debug like you are
used to do it in java - meaning stop if condition x is true and evaluate
expressions at that point. i made some mistakes that i would have
immediately seen in a standard debug session, but i don't know how i could
have seen it in clojure. i needed to think a lot more or add debug output
to understand those bugs - like flipping x and y in a grid. so, fixing bugs
took longer than it takes in java.
* how do you deal with complex data structures? since i cannot tell what
the type of a parameter is, it could be anything, including a map with
unknown content. i can only see which properties of it are immediately
accessed. is that the trick? to not care about what you don't care about?
and having something like hallucinated interfaces?

what are your experiences?

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Re: Is Clojure right for me?

2013-12-26 Thread Dennis Haupt

exactly which part of OOP is missing in clojure that you would like to use?
if you took my java code and ported it to clojure, the main difference
would be (a b) instead of b.a , but the main design would be similar


2013/12/26 Massimiliano Tomassoli kiuhn...@gmail.com

 On Thursday, December 26, 2013 7:51:39 PM UTC+1, James Reeves wrote:

 On 26 December 2013 16:32, Massimiliano Tomassoli kiuh...@gmail.comwrote:

 Thank you, Malcolm. I'm completely new to LISP and its dialects and I'm
 a little bit worried about the absence of support for OOP in Clojure. How
 do you decompose large systems in Clojure?


 You write functions. To quote Alan J. Perlis:

 It is better to have 100 functions operate on one data structure than to
 have 10 functions operate on 10 data structures.


 Classes or objects are not simple data structures.


 IMO, OOP just makes it harder to build modular systems, because OOP
 involves a lot of implicit connections between components. Clojure, and
 other functional languages, tend to emphasise isolation more.


 Why implicit? Objects communicate through well-defined channels. OOP can
 certainly be misused but it served me well for over 20 years (C++/C#). And
 Scala proves that FP and OOP are orthogonal paradigms. I can't see how the
 lack of OOP is a good thing for Clojure, honestly. I'm willing to give up
 mutability because I never programmed that way and I believe it can be a
 good thing (after I get used to it), but giving up OOP means going back to
 something I already know and I don't like.

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Re: How to go about 'proving' why dynamically typed languages are better.

2013-12-20 Thread Dennis Haupt

in my mental world, there is a pure human, and a 4 armed human would
probably be a 95% human or something, just like a hobbit would be. the
other way round, a human would be a 95% hobbit. an elephant would be 4%
hobbit on that scale.
this model is flexible, covers everything, and is not really helpful when
you ask what is it? you have to ask is this at least 90% cat?


2013/12/20 Phillip Lord phillip.l...@newcastle.ac.uk

 zcaudate z...@caudate.me writes:
  @philip lord.
 
  Where would mutant elephants and the elephant god Ganesha fit in that
 classification?


 It might surprise you to know that there is actually quite a lot work on
 both of these.

 The problem with mutant elephants generalises into the problem with
 abnormalities; for example, if I build a model of a human which says,
 humans have two hands, and two legs then there are plenty of counter
 examples, having more or less than two hands (mostly less). If, on the
 other hand, you have a model which can cope with these exceptions, then
 it gets too complex to handle, and you can rarely conclude anything
 useful.

 Ganesha causes a different problem: that is does he exist at all, and if
 he does, is he an elephant. Now there are those who say no he isn't, so
 he shouldn't be in the model. And, there are those (like me) who say,
 well it depends on your application and what you are trying to achieve.

 Farcical as all of this sounds, it does actually have implications for
 the way that we build data models, particularly for biology and
 medicine. If you are interested, you can read my paper on the subject
 here:

 http://www.russet.org.uk/blog/1713

 And a companion article by my co-author. It's about unicorns, but most
 of it probably covers Ganesha also.

 http://robertdavidstevens.wordpress.com/2011/05/26/unicorns-in-my-ontology/

 Phil

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Re: get fn and not-found

2013-10-27 Thread 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 arekand...@gmail.com

 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: How to go about 'proving' why dynamically typed languages are better.

2013-10-09 Thread Dennis Haupt

let's see...
really used:
sql
java
javascript
basic
pascal/delphi
scala

experimented with:
logo (some old language intended to teach people to make their first steps)
haskell
kotlin
clojure

seen in action:
php
groovy

still prefer smart static typing :D




2013/10/9 Nando Breiter na...@aria-media.com


 The best explanation of these misunderstandings I've come across is What
 to Know Before Debating Type Systems:

 http://cdsmith.wordpress.com/2011/01/09/an-old-article-i-wrote/


 I have learned quite a lot from reading this article and following this
 discussion, particularly that type and type checking is much more
 nuanced and complex than I have understood until now, and that the terms
 static and dynamic expand into a much larger range of issues upon close
 examination, such as the difference between explicitly declaring types (as
 in Java) and implicitly inferring types from code context. Quoting from the
 article:

 *Many programmers approach the question of whether they prefer static or
 dynamic types by comparing some languages they know that use both
 techniques. This is a reasonable approach to most questions of preference.
 The problem, in this case, is that most programmers have limited
 experience, and haven’t tried a lot of languages. For context, here, six or
 seven doesn't count as “a lot.”*
 *
 *

 So I can say I prefer dynamic typing, but the reasons are more personal,
 and molded by my development experience.

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Re: How to go about 'proving' why dynamically typed languages are better.

2013-10-09 Thread Dennis Haupt

especially haskell  scala are missing in your list :)
as long as you haven't at least seen haskell, you haven't seen the creme de
la creme of statically typed languages


2013/10/9 Softaddicts lprefonta...@softaddicts.ca

 Let's see:

 strong data typing:

 Fortran
 Cobol
 Pl/1
 Pascal
 C/C++
 Java
 C#
 Ruby

 à la carte data typing or no data typing at all:

 Basic (more or less depending on the implementation)
 Lisp
 Clojure
 A dozen assemblers
 A dozen scripting languages

 And I probably forgot some while excluding the ones I worked with
 (Algol, Simula, GPSS, ...) in academic projects. I used the above ones
 on real projects at work and not small projects.

 Lets keep SQL out of the picture, it's an exaggeration to call this a
 programming
 language.

 Still prefer less data typing or no typing at all :)

 Luc P.


  let's see...
  really used:
  sql
  java
  javascript
  basic
  pascal/delphi
  scala
 
  experimented with:
  logo (some old language intended to teach people to make their first
 steps)
  haskell
  kotlin
  clojure
 
  seen in action:
  php
  groovy
 
  still prefer smart static typing :D
 
 
 
 
  2013/10/9 Nando Breiter na...@aria-media.com
 
  
   The best explanation of these misunderstandings I've come across is
 What
   to Know Before Debating Type Systems:
  
   http://cdsmith.wordpress.com/2011/01/09/an-old-article-i-wrote/
  
  
   I have learned quite a lot from reading this article and following this
   discussion, particularly that type and type checking is much more
   nuanced and complex than I have understood until now, and that the
 terms
   static and dynamic expand into a much larger range of issues upon
 close
   examination, such as the difference between explicitly declaring types
 (as
   in Java) and implicitly inferring types from code context. Quoting
 from the
   article:
  
   *Many programmers approach the question of whether they prefer static
 or
   dynamic types by comparing some languages they know that use both
   techniques. This is a reasonable approach to most questions of
 preference.
   The problem, in this case, is that most programmers have limited
   experience, and haven’t tried a lot of languages. For context, here,
 six or
   seven doesn't count as “a lot.”*
   *
   *
  
   So I can say I prefer dynamic typing, but the reasons are more
 personal,
   and molded by my development experience.
  
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For

Re: How to go about 'proving' why dynamically typed languages are better.

2013-10-08 Thread Dennis Haupt

while i can see the strengths of both sides, the ideal solution is imho
this:

everything is statically typed. always. but you *never* have to write
the type explicitly. you *can* do it, but it is always optional.

i made good experiences with both scala and haskell (although i just
wrote minor things in the latter). the compiler really helps spotting
oops-errors early on, and the ide (in case of scala) has a lot of
information about the code and can assist you in ways that are simply
impossible without static typing.

please, do not confuse java with static typing. static typing could
also track all supported methods of an object as its type. imagine java,
but let every class implement one interface for each method that can be
called on it - its inferred type is, instead of just a simple class, the
set of interfaces necessary for the code to compile.
to actually write that would be completely annoying, but if a compiler
actually does the work for you and breaks it down, you would have a lot
of error checking and static information without losing much flexibility

Am 09.10.2013 00:36, schrieb Kendall Shaw:
 Some things that I see most of the time when I read debates about
 dynamic vs static are:
 
 1. Statically defined types don't solve everything, so they are not useful.
 
 Some help is better than no help even if the help doesn't solve all of
 your problems.
 
 Yes, you should wash your hands before dinner, even though we are all
 going to die in the end anyway.
 
 2. I like static typing as long as it is optional
 
 In the case where the point of using statically defined types is to have
 a compiler catch problems instead of you needing to predict their
 occurrence then static typing would have to be non-optional.
 
 3. You don't need the compiler to warn you about types, because you can
 write tests.
 
 A difficult problem is one that occurs on a rare occasion in some place
 that you would not have thought to check. So, you can't expect to be
 able to catch them with tests. If the problem is one that would have
 been flagged as a compile-time error, then in that case it would have
 been useful to have been using static typing.
 
 I am still unsure. It seems likely that the usefulness of statically
 defined types would depend upon the application. When using statically
 defined types makes development slower to an extent that outways the
 benefit, then it is bad. If  faster initial development as a result of
 dynamic typing ultimately ends up taking more time because of problems
 that would have been caught by a compiler, then it is bad. If statically
 defined typing makes you not discover things you would have because of
 the overhead of dealing with the static typing, then that is bad.
 
 Kendall
 
 
 On 10/05/2013 08:35 PM, zcaudate wrote:
 I'm a little bit miffed over this current craze of `types` and
 `correctness` of programs. It smells to me of the whole `object` craze
 of the last two decades. I agree that types (like objects) have their
 uses, especially in very well defined problems, but they have got me
 in trouble over and over again when I am working in an area where the
 goal is unclear and requirements are constantly changing. 

 BTW... This is no means a criticism of all the type system work that
 is going on in the clojure community. I am a huge fan of Ambrose's
 Typed Clojure project because it gives me the *option *of using
 types... not shoving it down my throat. I like the freedom to choose.

 My experience of programming in clojure has freed me from thinking
 about types and hierarchies and this article rings so true:
 http://steve.yegge.googlepages.com/is-weak-typing-strong-enough.

 However, everywhere I look, there are smug type-weenies telling me
 that my dynamically typed program is bad because it cannot be `proven
 correct` and not `checked by the compiler`. This question on SO really
 makes me
 angry 
 http://stackoverflow.com/questions/42934/what-do-people-find-so-appealing-about-dynamic-languages
 because no one is defending dynamic languages on there. The reason is
 very simple. because we don`t have a theory to back us up!

 I do want to put up an counter argument against this barrage of abuse
 against dynamic languages. And I want to put some academic weight
 behind this. The only counter I could come up with was to use Godel's
 incompleteness theorem. For those that don't know... here is an
 introduction to the man and his theory.
 http://www.youtube.com/watch?v=i2KP1vWkQ6Y. Godel's theorem,
 invalidated Principia Mathematica as a complete system of description.
 Principia Mathematica btw  effectively led to Type Theory.


 According to http://en.wikipedia.org/wiki/Type_theory. The types
 of type theory were invented by Bertrand Russell in response to
 his discovery that Gottlob Frege's version of naive set theory was
 afflicted with Russell's paradox. This theory of types features
 prominently in Whitehead and Russell's Principia

Re: too circular?

2013-08-29 Thread Dennis Haupt

thx again


2013/8/30 Bruno Kim Medeiros Cesar brunokim...@gmail.com

 This exact use case is covered by letfn, which creates a named fn
 accessible to all function definitions and the body. That even allows
 mutual recursive definitions without declare. Your example would be

  (defn fib-n [n]
(letfn [(fib [a b]

 (cons a (lazy-seq (fib b (+ b a)]
  (take n (fib 1 1

 Note that its grammar is

 (letfn [fnspecs*] exprs*)
 fnspec == (fname [params*] exprs)

 That is, don't forget to surround a function definition with parentheses
 as above, and not as

 (letfn [fib [a b] ...])
 CompilerException java.lang.IllegalArgumentException: Don't know how to
 create ISeq from: clojure.lang.Symbol

 The reason is that letfn accepts multiple definitions, and as each
 function can have multiple expressions as in a do form, you can't just
 partition the vector as you do in let.

 On Thursday, August 29, 2013 4:32:00 PM UTC-3, Jim foo.bar wrote:

 On 29/08/13 20:23, JvJ wrote:
  I wonder if the somewhat counterintuitive concept of a named
  anonymous function eludes some people, or isn't properly conveyed in
  tutorials.

 I only consider #(...) as an anonymous function. The longer form (fn []
 (...)) has the potential of being perfectly named, it's just you who
 doesn't give it a name usually...

 Jim

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Re: too circular?

2013-08-27 Thread Dennis Haupt

thx


2013/8/26 Marshall Bockrath-Vandegrift llas...@gmail.com

 Dennis Haupt d.haup...@gmail.com writes:

  (defn fib-n [n]
  (let [fib (fn [a b] (cons a (lazy-seq (fib b (+ b a)]
  (take n (fib 1 1
 
  can't i do a recursion here? how can i achieve this without doing an
  outer defn?

 You just need to give the anonymous function a name it can use to refer
 to itself for (non-tail) recursion:

 (defn fib-n [n]
   (let [fib (fn fib [a b] (cons a (lazy-seq (fib b (+ b a)]
 (take n (fib 1 1

 -Marshall

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Re: profiler?

2013-08-27 Thread Dennis Haupt

yep, yourkit


2013/8/27 Jay Fields j...@jayfields.com

 What are you all using these days? I've been using YourKit and I'm
 fairly happy with it. Just making sure I'm not missing out on some new
 hotness.

 Cheers, Jay

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too circular?

2013-08-26 Thread Dennis Haupt

(defn fib-n [n]
  (let [fib (fn [a b] (cons a (lazy-seq (fib b (+ b a)]
(take n (fib 1 1

can't i do a recursion here? how can i achieve this without doing an outer
defn?

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Re: Entwined STM V1.0

2013-08-18 Thread dennis zhuang

That's really cool.
Do you have any performance benchmark between TransactionalMap and
java.util.concurrent.ConcurrentHashMap?  When should i use these
collections instead of java.util.concurrent.* collections?




2013/8/18 Ivan Koblik ivankob...@gmail.com

 Hi All,

 Almost 4 years ago I developed STM with semantic concurrency control for
 my project at CERN. Main feature of this STM is the TransactionalMap that
 lets you merge concurrent changes. Library is heavily tested and is very
 stable. It has been used in production for the past 2 years.

 Recently I released it on GitHub:
 http://entwined.koblik.ch (will redirect to
 https://github.com/CERN-BE/Entwined-STM)

 Since Entwined STM was designed to be used from Java I wrote a simple
 facade for it in Clojure that you can load with

 (require '[cern.entwined.core :as stm])

 Entwined STM operates on a memory with a fixed structure, meaning that you
 have to define what and how many collections you want to have in your STM
 and this can't be changed after construction. To construct memory with 1
 transactional map and 1 transactional queue run this:

 (def memory (stm/create-memory :map (stm/create-map) :queue
 (stm/create-queue)))

 It's impossible to access transactional entities outside of a transaction,
 to run a transaction you can use intrans macro

 (stm/intrans memory data (- data :map (.put :key1 value1)) true)

 (stm/intrans memory data (- data :map (.get :key1))) ;- value1

 First line puts [:key1 value1] pair into the map. True at the end of the
 body tells the memory to commit this transaction. intrans will initiate
 commit if body returns truthy value. Second line just shows that the change
 has been committed.

 A couple more words on the implementation: I used HashMap to implement the
 TransactionalMap, I copy the backing map for every transaction which may be
 expensive for some scenarios. Obvious solution would be to use Clojure's
 persistent map. Commits are eventually serialized and protected with a
 single lock. If you take a look at the Java source you'll see that
 Transaction interface has a second method committed that is called when
 commit is being done. I use this method to write to the hardware knowing
 that execution order of committed callbacks is the same as the commit order.

 I would greatly appreciate any feedback and suggestions. If you have any
 questions don't hesitate to ask here or email me directly. Documentation is
 still somewhat lacking and I'd be interested to know which parts of it
 should be improved first.

 Cheers,
 Ivan.

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Re: Can we please deprecate the :use directive ?

2013-07-24 Thread dennis zhuang

I am using ':use' for my own namespaces.I know it's discouraged, but if i
can control my own code,why not? Compiler can give me warnings and i
process all warnings carefully.

2013/7/25 Steven Degutis sbdegu...@gmail.com

If our votes count for anything, then I'd like to add +1 for getting rid
of :use, and strongly discouraging :refer :all.

On Wed, Jul 24, 2013 at 11:16 AM, Alex Baranosky
alexander.barano...@gmail.com wrote:

+1 for scary compiler deprecation warning for 1.6.0, then removing :use
in the 1.7.0 release.

On Wed, Jul 24, 2013 at 8:49 AM, Softaddicts lprefonta...@softaddicts.ca
wrote:

I disagree, when I use tracing fns and other useful REPL tools,
I like to have them included without having to prefix them with an alias.

It's not a hack it's a feature and you are free to use it or not.
If code writers do not care about code readers it's a choice, maybe bad
but
that decision is not yours to take. It's theirs in their own context.

Now this thread has slowly shifted to can we streamline how we express
this
feature to lets forbid this feature to be used. If ends up creating
such
policies enforced by the language, it's the wrong route.

My answer to such proposals is a definite no. This a red line to me
that should
not be crossed.

Luc P.

I hate it mainly in blogs, where they explain some new API. They :use
like 3 namespaces and you have to guess which fn is from which ns :)

Agree.
Code is read much more often than it is written, so omitting a few
character is not effective time-saving.
I also don't like :refer :all.
I think it should be considered hack rather than official feature.

On Wednesday, July 24, 2013 3:17:02 AM UTC+9, Jozef Wagner wrote:

+1, :use is IMO an antipattern.

I hate it mainly in blogs, where they explain some new API. They
:use like
3 namespaces and you have to guess which fn is from which ns :)

On Tuesday, July 23, 2013 5:50:50 PM UTC+2, Greg Slepak wrote:

I think I read somewhere that :use is no longer encouraged, but I
could
be mistaken.

From what I've read, it seems like most people agree that Clojure
has too
many ways of including/importing/referencing/requiring/using things:

http://blog.8thlight.com/colin-jones/2010/12/05/clojure-libs-and-namespaces-require-use-import-and-ns.html

The above gives a very nice explanation of all the various
difference,
but it also acknowledges their complexity.

Since :use uses :require, and since :require can do everything that
:use
can, can we simplify Clojure programming a bit for newcomers by
deprecating
the use of :use? The situation in ClojureScript is even worse
because it
adds :require-macros on top of all the other ways of including
files.

Ideally, it would be awesome if there was just a single directive
for
everything, but perhaps there's some complicated low-level reason
why
that's not possible. :-\

Thoughts?

Thanks,
Greg

P.S. If this has already been brought up you have my sincere
apologies.

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{{ANN} clj-xmemcached release 0.2.3

2013-07-19 Thread dennis zhuang

An opensource memcached client for clojure,it wraps xmemcached.

0.2.3 releases, main highlights:

1.Supports delete with CAS value in binary protocol


 ;;delete with CAS
(xm/delete num (:cas (gets num)))

2.Supports lighweight distribution lock with try-lock macro:


(def counter (atom 0))
(future (try-lock lock 5 (do (Thread/sleep 3000)
   (swap! counter inc))
(println else1)))
(future (try-lock lock 5 (do (Thread/sleep 3000)
   (swap! counter inc))
(println else2)))
(future (try-lock lock 5 (do (Thread/sleep 3000)
   (swap! counter inc))
(println else3)))

(Thread/sleep 4000)
(is (nil? (get lock)))
(is (= 1 @counter))

3.Through macro:


(through uid (get-user-from-databse uid))

Equals to:


(if-let [rt (get uid)]
rt
(let [rt (get-user-from-database uid)]
(when rt
(add uid rt 0))
rt))

4.Upgrade xmemcached to 1.4.2

More tutorial please visit https://github.com/killme2008/clj-xmemcached

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Re: core.async

2013-07-06 Thread dennis zhuang

It's so cool,great job!
But i don't find any way to do io blocking operations such as socket.read
in 'go'.
Is there a roadmap to make alts! working with java NIO selector that waits
on socket channels?
Then we can read/write data with socket/file channel in go without blocking.
Thanks,it's really awesome!




2013/7/1 David Pollak dpollak...@gmail.com

 Thanks!


 On Mon, Jul 1, 2013 at 8:13 AM, Sean Corfield seancorfi...@gmail.comwrote:

 On Sun, Jun 30, 2013 at 4:42 PM, David Pollak dpollak...@gmail.com
 wrote:
  Looking forward to it
  being published (even as SNAPSHOT) in a Maven repo.

 It's accessible like this:

 (defproject async 0.1.0-SNAPSHOT
   :description FIXME: write description
   :url http://example.com/FIXME;
   :license {:name Eclipse Public License
 :url http://www.eclipse.org/legal/epl-v10.html}
   :repositories {sonatype-oss-public
 https://oss.sonatype.org/content/groups/public/}
   :dependencies [[org.clojure/clojure 1.5.1]
  [org.clojure/core.async 0.1.0-SNAPSHOT]])
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Re: reset! and merge for (transient {})

2013-07-02 Thread dennis zhuang

Maybe he means clear?


2013/7/2 Jim jimpil1...@gmail.com

 No merge will not work with transients because it uses conj instead of
 conj!
 If you absolutely have to do this define your own 'merge!' that uses conj!.

 I'm not sure what you mean by reset! for transients...reset! is an
 operation on reference types (atom, ref, agent etc)

 Jim



 On 02/07/13 11:33, Amir Wasim wrote:

 Is there reset! and merge a possibility for (transient {})

 sometimes we have a doseq and it might be requirement sometime.
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Re: reset! and merge for (transient {})

2013-07-02 Thread dennis zhuang

Clear the collection.
user= (doc empty)
-
clojure.core/empty
([coll])
  Returns an empty collection of the same category as coll, or nil
nil


2013/7/2 Jim jimpil1...@gmail.com

  what is 'clear' ? cannot find it anywhere...

 Jim



 On 02/07/13 12:03, dennis zhuang wrote:

 Maybe he means clear?


 2013/7/2 Jim jimpil1...@gmail.com

 No merge will not work with transients because it uses conj instead of
 conj!
 If you absolutely have to do this define your own 'merge!' that uses
 conj!.

 I'm not sure what you mean by reset! for transients...reset! is an
 operation on reference types (atom, ref, agent etc)

 Jim



 On 02/07/13 11:33, Amir Wasim wrote:

 Is there reset! and merge a possibility for (transient {})

 sometimes we have a doseq and it might be requirement sometime.
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{ANN} clj-xmemacched release 0.2.2

2013-06-24 Thread dennis zhuang

An opensource memcached client for clojure wrapping
xmemcachedhttp://code.google.com/p/xmemcached/.It
released 0.2.2, added 'clj-json-transcoder' that encode/decode values using
clojure.data.json.

https://github.com/killme2008/clj-xmemcached


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multimethods for non constant values?

2013-06-23 Thread Dennis Haupt

i found example that i can do
(defmethod x 5 [y] (do stuff))

but can i do
(defmethod #( % 10) [y] (do stuff)) somehow? like in a pattern match of
haskell/scala?

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Re: multimethods for non constant values?

2013-06-23 Thread Dennis Haupt

i see
thx


2013/6/23 László Török ltoro...@gmail.com

 you need a dispatch functions that produces discrete dispatch values
 using your example:

 (defmulti x #(cond
( % 10) :less-than-10
   ;;... further conditions producing different dispatch
 values
 ))
 ;; dispatch on the dispatch values
 (defmethod x :less-then-10 [x] (do ))

 Hope it helps

 Las


 2013/6/23 Dennis Haupt d.haup...@gmail.com

 i found example that i can do
 (defmethod x 5 [y] (do stuff))

 but can i do
 (defmethod #( % 10) [y] (do stuff)) somehow? like in a pattern match of
 haskell/scala?

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Re: can't compile anything except def

2013-06-23 Thread Dennis Haupt

plugin version is 0.5.286

Am 23.06.2013 00:25, schrieb Colin Fleming:
 Which version of the IntelliJ plugin are you using? You can see this by
 opening the settings, selecting plugins then selecting the La Clojure
 plugin. In recent versions the compiler has changed and I've had
 occasional problems with it.
 
 
 On 23 June 2013 02:29, Dennis Haupt d.haup...@gmail.com
 mailto:d.haup...@gmail.com wrote:
 
 it happens with both clojure 1.5.1 and 1.4.0. when intellij tries to
 compile clojure files, something strange happens. if i remove the
 option to compile the files (and instead just use clojure.main and
 run them) there is no problem
 
 
 
 
 2013/6/22 Jim - FooBar(); jimpil1...@gmail.com
 mailto:jimpil1...@gmail.com
 
 On 22/06/13 15:21, Dennis Haupt wrote:
 
 clojure jvm, intellij's repl. i'll try to run the file via
 commandline and see what happens
 
 
 where did core.clr come from then?
 
 can you somehow see what version of clojure your intelliJ is
 using? I've got no experience with intelliJ really...it's just
 that your error you reported earlier is very weird...
 
 
 Jim
 
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multimethod noob question

hi,

i was taking a look at multimethods:
(defmulti fac int)
(defmethod fac 1 [_] 1)
(defmethod fac :default [n] (*' n (fac (dec n

this works

however, this also works:

(defmulti fac print)
(defmethod fac 1 [_] 1)
(defmethod fac :default [n] (*' n (fac (dec n

what exactly is int or print doing? it doesn't seem to have an effect?

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can't compile anything except def

hi,

i'm trying to compiler a clojure file using intellij. the error i get is:
Clojure Compiler: java.io.IOException: The system cannot find the path
specified, compiling:(D:\cloj\MultiMethod.clj:3)

where the line number is pointing at a line that contains something that is
declared in core.clr
if i use only def, everything works, i can compile the file

what's the problem?

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Re: can't compile anything except def

i don't know what properly set up the environment means exactly, but i
can run my script in the repl


2013/6/22 Jim - FooBar(); jimpil1...@gmail.com

 On 22/06/13 15:09, Dennis Haupt wrote:

 where the line number is pointing at a line that contains something that
 is declared in core.clr


 core.clr and intelliJ? I've never used intelliJ but I was under the
 impression it was JVM only...

 are you sure you've got the right version of Clojure and properly set up
 your environment?

 Jim

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Re: multimethod noob question

i am not trying anything, i just want to figure out what happens. this is
my output for the print version:
user= (defmulti fac print)
(defmethod fac 1 [_] 1)
(defmethod fac :default [n] (*' n (fac (dec n
#'user/fac
#MultiFn clojure.lang.MultiFn@1afb02d
#MultiFn clojure.lang.MultiFn@1afb02d
user= (fac 1)
10-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-21-22-23-24-25-26-27-28-until
stackoverflow


2013/6/22 Chris Bilson cbil...@pobox.com

 Dennis Haupt d.haup...@gmail.com writes:

  i was taking a look at multimethods:
  (defmulti fac int)
  (defmethod fac 1 [_] 1)
  (defmethod fac :default [n] (*' n (fac (dec n
 
  this works
 
  however, this also works:
 
  (defmulti fac print)
  (defmethod fac 1 [_] 1)
  (defmethod fac :default [n] (*' n (fac (dec n

 This definately does not work when I try it:

  user (defmulti fac print)
  #Var@6427854d: #MultiFn clojure.lang.MultiFn@4bddef9a
  nil
  user (defmethod fac 1 [_] 1)
  #MultiFn clojure.lang.MultiFn@4bddef9a
  nil
  user (fac 1)
  IllegalArgumentException No method in multimethod 'fac' for dispatch
 value: null  clojure.lang.MultiFn.getFn (MultiFn.java:160)
  1

 The second arg to defmulti's job is to decide which method to call. The
 print function always produces nil, so you would need a defmethod for
 dispatch value nil to use print as a dispatch function:

 user (defmethod fac nil [_] 2)
 #MultiFn clojure.lang.MultiFn@4bddef9a
 nil
 user (fac 1)
 12
 nil

 Notice the 12: the 1 is from print and the 2 is the value the
 method produced.

 Are you trying to print the dispatch values so you can see them for
 tracing or something? If so, you could try something like:

 user (defn inspect [ stuff]
 (println inspect:  stuff)
 (first stuff))
 #Var@5b1413a8:
   #user$eval336$inspect__337 user$eval336$inspect__337@68903261
 nil
 user (inspect 1)
 inspect:  (1)
 1
 nil
 user (defmulti fac2 inspect)
 nil
 nil
 user (defmethod fac2 1 [_] 1)
 #MultiFn clojure.lang.MultiFn@e2df60d
 nil
 user (fac2 1)
 inspect:  (1)
 1
 nil
 user


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Re: can't compile anything except def

clojure jvm, intellij's repl. i'll try to run the file via commandline and
see what happens


2013/6/22 Jim - FooBar(); jimpil1...@gmail.com

 On 22/06/13 15:16, Dennis Haupt wrote:

 i don't know what properly set up the environment means exactly, but i
 can run my script in the repl


 what repl? intelliJ's repl? or a bare repl from your terminal?

 do you want to use Clojure JVM or Clojure CLR?


 Jim

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Re: can't compile anything except def

running the file works (from inside intellij), just intellijs compilation
seems to be broken i can ignore the problem for now


2013/6/22 Dennis Haupt d.haup...@gmail.com

 clojure jvm, intellij's repl. i'll try to run the file via commandline and
 see what happens


 2013/6/22 Jim - FooBar(); jimpil1...@gmail.com

 On 22/06/13 15:16, Dennis Haupt wrote:

  i don't know what properly set up the environment means exactly, but i
 can run my script in the repl


 what repl? intelliJ's repl? or a bare repl from your terminal?

 do you want to use Clojure JVM or Clojure CLR?


 Jim

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Re: can't compile anything except def

it happens with both clojure 1.5.1 and 1.4.0. when intellij tries to
compile clojure files, something strange happens. if i remove the option to
compile the files (and instead just use clojure.main and run them) there is
no problem




2013/6/22 Jim - FooBar(); jimpil1...@gmail.com

 On 22/06/13 15:21, Dennis Haupt wrote:

 clojure jvm, intellij's repl. i'll try to run the file via commandline
 and see what happens


 where did core.clr come from then?

 can you somehow see what version of clojure your intelliJ is using? I've
 got no experience with intelliJ really...it's just that your error you
 reported earlier is very weird...


 Jim

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Re: multimethod noob question

yes. all glory to the repl that makes me figure out the internals via
experiments :D
is there a way to just pass the given value along?


2013/6/22 Chris Bilson cbil...@pobox.com

 Dennis Haupt d.haup...@gmail.com writes:

  i am not trying anything, i just want to figure out what happens. this
 is my output for the print version:
  user= (defmulti fac print)
  (defmethod fac 1 [_] 1)
  (defmethod fac :default [n] (*' n (fac (dec n
  #'user/fac
  #MultiFn clojure.lang.MultiFn@1afb02d
  #MultiFn clojure.lang.MultiFn@1afb02d
  user= (fac 1)
 
 10-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-21-22-23-24-25-26-27-28-until
  stackoverflow

 Since print produces nil for a dispatch value, and nil is not 1, it
 always calls your :default method.

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Re: multimethod noob question

(ns experiments.MultiMethod)
(defmulti fac identity)
(defmethod fac 1 [n] (print n: n - ) 1)
(defmethod fac :default [n] (*' n (fac (dec n
(print (fac 125))

if i am getting this right, defmethod fac stuff [stuff2] is the
equivalent to a scala or haskell pattern match, where stuff is the match
and stuff2 is the complete set of original arguments?

can you provide an example where stuff2 has more information than stuff?
for fac, both are equal

thx :D


2013/6/22 Dennis Haupt d.haup...@gmail.com

 yes. all glory to the repl that makes me figure out the internals via
 experiments :D
 is there a way to just pass the given value along?


 2013/6/22 Chris Bilson cbil...@pobox.com

 Dennis Haupt d.haup...@gmail.com writes:

  i am not trying anything, i just want to figure out what happens. this
 is my output for the print version:
  user= (defmulti fac print)
  (defmethod fac 1 [_] 1)
  (defmethod fac :default [n] (*' n (fac (dec n
  #'user/fac
  #MultiFn clojure.lang.MultiFn@1afb02d
  #MultiFn clojure.lang.MultiFn@1afb02d
  user= (fac 1)
 
 10-1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18-19-20-21-22-23-24-25-26-27-28-until
  stackoverflow

 Since print produces nil for a dispatch value, and nil is not 1, it
 always calls your :default method.

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Re: multimethod noob question