If y're Sco'ish... -> 59
(dotimes[i 4](println"Appy Birthdy"({2"D'r XXX"}i"To Ye")))
Appy Birthdy To Ye
Appy Birthdy To Ye
Appy Birthdy D'r XXX
Appy Birthdy To Ye
On Fri, Sep 18, 2009 at 6:35 AM, David Nolen wrote:
> hiredman in the lead!
> (dotimes[i 4](println"Happy Birthday"({2"Dear XXX"}i
> Clojure REPL will display nil for anything that causes side-effect?
> I had no idea!
More accurately, any side effects that print will be printed, then the
return value of the function will be printed by the REPL (the "P" part).
If the function returns nil, you'll see a final nil appear.
ma
On Fri, Sep 18, 2009 at 2:41 AM, Wilson MacGyver wrote:
>
> Clojure REPL will display nil for anything that causes side-effect?
> I had no idea!
>
No. The return value of println _is_ nil. map takes a collection of values
and returns a new collection of values by applying the supplied fn on each
Clojure REPL will display nil for anything that causes side-effect?
I had no idea!
On Fri, Sep 18, 2009 at 2:24 AM, Krukow wrote:
> Yes, the result of the computation is (nil nil nil nil), a side-effect
> is printing:
> Happy Birthday To You
> Happy Birthday To You
> Happy Birthday Dear XXX
> Ha
On Sep 18, 6:24 am, Wilson MacGyver wrote:
> Hmmm, your solution produces nils in REPL.
>
> user=> (map #(printf "Happy Birthday %s\n" (if (= 2 %) "Dear XXX" "To
> You")) (range 4))
> (Happy Birthday To You
> Happy Birthday To You
> nil Happy Birthday Dear XXX
> nil Happy Birthday To You
> nil
There's also re-split in str-utils in clojure.contrib;
(use 'clojure.contrib.str-utils)
(re-split #"\s" "The quick brown fox")
=> ("The" "quick" "brown" "fox")
You can then use all the good clojure collection functions;
(def words (re-split #"\s" "The quick brown fox"))
(some #{"brown"} words)
http://www.pragprog.com/magazines/download/1.pdf
Page 16
RH talks about Erlang and Scala vs Clojure in an interview
I found it to be a very useful comparison.
On Sep 18, 8:54 am, dongbo wrote:
> Hi everyone,
>
> Can any one give a comparison between Clojure and Erlang on concurrent
> programmi
Yes, that would work. I keep forgetting the try finally acts like
unwind-protect. Even if the thread is killed the finally process will
execute. Ehh...
On Sep 17, 5:50 pm, John Harrop wrote:
> On Thu, Sep 17, 2009 at 6:15 PM, Gorsal wrote:
> > Or maybe i could simply push to the global var and
hiredman in the lead!
(dotimes[i 4](println"Happy Birthday"({2"Dear XXX"}i"To You"))) -> 63
On Fri, Sep 18, 2009 at 12:32 AM, Kevin Downey wrote:
>
> :(
>
> map is lazy, so you'll need to wrap it in doall
>
> (dotimes [i 4] (println "Happy Birthday" ({2 "Dear XXX"} i "To You")))
>
> On Thu, Sep
:(
map is lazy, so you'll need to wrap it in doall
(dotimes [i 4] (println "Happy Birthday" ({2 "Dear XXX"} i "To You")))
On Thu, Sep 17, 2009 at 9:17 PM, David Nolen wrote:
> Actually to be fair, here's a Clojure version that uses as little whitespace
> as the Scala and Java ones do.
> (map #
(dotimes[x 4](println"Happy Birthday"(if(= x 2)"Dear XXX""To You"))) -> 68
chars!
Sorry I'm getting carried away now :)
On Fri, Sep 18, 2009 at 12:26 AM, David Nolen wrote:
> (dorun(map #(println"Happy Birthday %s"(if(= 2 %)"Dear XXX""To You"))(range
> 4))) ; -> 80 chars
> should produce the corr
In general I think the STM solution to most concurrency issues looks
promising, however in the case of dining philosophers I found that Java
locking was easier than a ref, atom or agent solution.
;;
(import java.util.concurrent.locks.ReentrantReadWriteLock)
(defn nth-chopstick [chopsticks i side]
Hi everyone,
Can any one give a comparison between Clojure and Erlang on concurrent
programming?
Both of them are kinda pure functional programming language, which
avoiding the state changes in general. Erlang provides message passing
mechanism to handle the inter-thread communication, while Clo
(dorun(map #(println"Happy Birthday %s"(if(= 2 %)"Dear XXX""To You"))(range
4))) ; -> 80 chars
should produce the correct output at the repl. This is probably the most
correct one.
can we get shorter? :)
On Fri, Sep 18, 2009 at 12:24 AM, Wilson MacGyver wrote:
>
> Hmmm, your solution produces ni
On Thu, Sep 17, 2009 at 6:15 PM, Gorsal wrote:
> Or maybe i could simply push to the global var and in addition to the
> value use a unique gensymed id. Then once the local binding was done
> it would pop until it sees its gensymed id. That would work in the
> situation that a local binding faile
Hmmm, your solution produces nils in REPL.
user=> (map #(printf "Happy Birthday %s\n" (if (= 2 %) "Dear XXX" "To
You")) (range 4))
(Happy Birthday To You
Happy Birthday To You
nil Happy Birthday Dear XXX
nil Happy Birthday To You
nil nil)
On Fri, Sep 18, 2009 at 12:19 AM, Krukow wrote:
>
>
>
>
On Thu, Sep 17, 2009 at 3:06 PM, Mark Volkmann wrote:
>
> On Thu, Sep 17, 2009 at 1:43 PM, z5h wrote:
> >
> > Specifically some problems encountered in Clojure's STM and bytecode
> > generation.
> >
> >
> http://www.azulsystems.com/events/javaone_2009/session/2009_J1_JVMLang.pdf
> > (Slide's 8 an
On Sep 18, 5:53 am, Wilson MacGyver wrote:
> This blog post got me
> thinking.http://www.artima.com/weblogs/viewpost.jsp?thread=268561
>
> Basically it contains both a Java one liner and Scala one liner.
>
> Java:
> for(int i=0; i<4; i++) { System.out.println("Happy Birthday " + (i==2
> ? "Dea
actually 82, you missed a ) at the end.
should be
(map #(str "Happy Birthday " %) (assoc (vec (replicate 4 "To You")) 2
"Dear XXX"))
my other concern is what the article is discussing, namely making this
readable to other people who don't know clojure.
I don't know how readable it is to java p
Spoke too soon:
(map #(str"Happy Birthday "%)(assoc(vec(replicate 4"To You"))2"Dear XXX"))
-> 74
On Fri, Sep 18, 2009 at 12:17 AM, David Nolen wrote:
> Actually to be fair, here's a Clojure version that uses as little
> whitespace as the Scala and Java ones do.
>
> (map #(str"Happy Birthday "%)(
Actually to be fair, here's a Clojure version that uses as little whitespace
as the Scala and Java ones do.
(map #(str"Happy Birthday "%)(assoc (vec (replicate 4"To You"))2"Dear XXX"))
; -> 76 chars
On Fri, Sep 18, 2009 at 12:14 AM, David Nolen wrote:
> Your basic approach seems sound:
> (map #(
Your basic approach seems sound:
(map #(str "Happy Birthday " %) (assoc (vec (replicate 4 "To You")) 2 "Dear
XXX") -> 81 chars including white space
for(int i=0;i<4;i++){System.out.println("Happy Birthday "+(i==2?"Dear
XXX":"To You"));}) -> 88 chars
(1 to 4).map{i=>"Happy Birthday %s".format(if(i
We're going to have a meetup on clojure and cascading and Rapleaf Sept
24th: http://blog.rapleaf.com/dev/?p=196
Come on by.
Debate about function composition as a programming model for distributed
computation.
Impress your friends.
-b
--~--~-~--~~~---~--~~
You
This blog post got me thinking.
http://www.artima.com/weblogs/viewpost.jsp?thread=268561
Basically it contains both a Java one liner and Scala one liner.
Java:
for(int i=0; i<4; i++) { System.out.println("Happy Birthday " + (i==2
? "Dear XXX" : "To You")); }
Scala:
(1 to 4).map { i => "Happy Bi
O_o mind bendingly awesome.
Really great article! I found it very helpful thanks.
On Sep 18, 8:35 am, Tom Faulhaber wrote:
> In case this is interesting to anyone:
>
> I just posted a description of how I created the webhook system for
> the contrib autodoc robot using Ring. Nothing too profou
On Sep 17, 9:33 am, Brian wrote:
> As a Java programmer coming to Clojure I would be very interested in the
> intended application. How you approach that from a Clojure perspective is
> what I'm interested in. I've programmed in Lisp in the distant past
> (Symbolics Lisp machines) and still ha
Thanks, that worked great!
Since my func came from a different namespace, the following seems to
work ok.
(defn dispatcher [name-space func-name alist]
(apply (ns-resolve *ns* (symbol func-name)) alist))
I am able to invoke this from my java code:
RT.loadResourceScript(pathScript);
Also keep in mind that for string operations the Java String provides
a lot of built in functionality:
(let [s "the quick brown fox"]
(.substring s (.indexOf s "brown")))
"brown fox"
And you could simply ask the regular expression to find what you want:
(re-find #"brown.*" "the quick brown fox")
2009/9/17 Hugh Aguilar :
>
> Thanks for the encouragement. I've already got the book.
>
> I suppose eventually I will have to learn Java. I have been putting it
> off because I hear a lot of Java-bashing from programmers, and have
> also noted that this is generally the impetus for the development
In case this is interesting to anyone:
I just posted a description of how I created the webhook system for
the contrib autodoc robot using Ring. Nothing too profound, but
probably useful to others.
You can find it here:
http://infolace.blogspot.com/2009/08/simple-webhooks-with-clojure-and-ring.
Yes Rich Hickey advises against it here...
http://groups.google.com/group/clojure/browse_frm/thread/9eaf7be6a65e70df#
On Sep 17, 9:26 pm, David Nolen wrote:
> I believe maps containing functions are generally looked down upon.
> Multimethods are probably the way to go. Can't you tag your request
Or maybe i could simply push to the global var and in addition to the
value use a unique gensymed id. Then once the local binding was done
it would pop until it sees its gensymed id. That would work in the
situation that a local binding failed to pop its own binding. That
might work...
On Sep 17,
Thanks for the replies!
Before I start doing something silly, I would like to ask another
question. The eventual goal of all of this is to establish bindings
which also affect the same global variable in other namespaces (these
other namespaces will 100% have the same global variable). In other
wo
On Sep 17, 7:33 pm, Gorsal wrote:
> Basically i need to redefine the meaning of a special form. While i am
> willing to change the name for things like ns to defpackage, i am not
> willing to change the name of forms like apply and defn to achieve my
> goals. Instead, i would like to redefine t
My experience so far is that most of the annoying things that get in
the way of doing cool Clojure things are due to Java. Things like how
classpaths work for example, and permissions. My experience with Java
comes from college courses I took about 10 years ago, so the Java
level of Clojure can
I believe maps containing functions are generally looked down upon.
Multimethods are probably the way to go. Can't you tag your request map with
a type?
On Thu, Sep 17, 2009 at 7:50 AM, Philipp Meier wrote:
>
> Hi,
>
> I'm building a REST server library on top of compojure loosely modeled
> after
On 17 Sep., 17:49, Stuart Sierra wrote:
> On Sep 17, 7:50 am, Philipp Meier wrote:
>
> > I'm building a REST server library on top of compojure loosely modeled
> > after the ideas of erlangs webmachine. The idea is to describe a
> > resource using a couple of function which server as decision
On Sep 17, 2009, at 3:44 PM, Daniel wrote:
>> As for first books on Java, Look for Bruce Eckel's "Thinking in
>> Java" [...]
>
> [...] If you want an intro to Java that
> is not dry and treats you as a reasonably intelligent being, try
> 'Thinking in Java'.
I would also recommend this book.
On Thu, Sep 17, 2009 at 9:59 PM, Terrance Davis
wrote:
>
> I'll add my two cents.
>
> You sound like you already program, so basic Java knowledge is useful
> with Clojure, but not necessary. You can pick up what you need to know
> as you learn Clojure. You will find hooks into Java are a lot more
On Thu, Sep 17, 2009 at 1:43 PM, z5h wrote:
>
> Specifically some problems encountered in Clojure's STM and bytecode
> generation.
>
> http://www.azulsystems.com/events/javaone_2009/session/2009_J1_JVMLang.pdf
> (Slide's 8 and 20-21)
Slide 20 - Should say "Nothing mutable by default" and "One ki
On Thu, Sep 17, 2009 at 2:49 PM, Stuart Sierra
wrote:
>
> On Sep 17, 12:40 pm, Gorsal wrote:
> > Oh. And just as a quick other question, do global bindings affect
> > threads which are started in the same ns?
>
> I think threads inherit the bindings in effect when they are created.
http://cloju
Specifically some problems encountered in Clojure's STM and bytecode
generation.
http://www.azulsystems.com/events/javaone_2009/session/2009_J1_JVMLang.pdf
(Slide's 8 and 20-21)
--~--~-~--~~~---~--~~
You received this message because you are subscribed to the Goog
On Thu, Sep 17, 2009 at 2:49 PM, Stuart Sierra
wrote:
>
> On Sep 17, 12:40 pm, Gorsal wrote:
>> Oh. And just as a quick other question, do global bindings affect
>> threads which are started in the same ns?
>
> I think threads inherit the bindings in effect when they are created.
They do not, o
2009/9/17 Laurent PETIT
>
> 2009/9/17 Stuart Sierra
>
>>
>> On Sep 17, 12:40 pm, Gorsal wrote:
>> > Oh. And just as a quick other question, do global bindings affect
>> > threads which are started in the same ns?
>>
>> I think threads inherit the bindings in effect when they are created.
>>
>
>
2009/9/17 Stuart Sierra
>
> On Sep 17, 12:40 pm, Gorsal wrote:
> > Oh. And just as a quick other question, do global bindings affect
> > threads which are started in the same ns?
>
> I think threads inherit the bindings in effect when they are created.
>
I would not place 1€ on this assumption
On Sep 17, 12:40 pm, Gorsal wrote:
> Oh. And just as a quick other question, do global bindings affect
> threads which are started in the same ns?
I think threads inherit the bindings in effect when they are created.
-SS
--~--~-~--~~~---~--~~
You received this me
On Sep 17, 12:33 pm, Gorsal wrote:
> Basically i need to redefine the meaning of a special form.
This depends on what you want to redefine. True "special forms" in
Clojure -- def if do let quote var fn loop recur throw try . new set!
-- cannot be redefined, period.
Anything else -- the content
On Thu, Sep 17, 2009 at 1:09 PM, John Harrop wrote:
> Don't commutes commute with one another, but not with other writes?
That's certainly correct from the standpoint of thinking about how
commutes get reexecuted during the commit and other writes (from
ref-set and alter) do not.
Here is how I
Don't commutes commute with one another, but not with other writes?
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Groups "Clojure" group.
To post to this group, send email to clojure@googlegroups.com
Note that posts from ne
I think you're looking for something more like this:
(use '[clojure.contrib.str-utils :only (str-join)])
(def mystr "the quick brown fox")
(defn split-at-word
[text keyword]
(str-join " " (drop-while (partial not= keyword)
(re-seq #"\w+" text
user=> (split
Aridaman Pandit wrote:
> Thanks for the reply. I understand the code that you have given.
> Actually I also wanted it to be stored into some variable (if not the
> same) everytime I run it.
> Suppose I am matching for keyword "brown" and I want to store
> everything after "brown". So for that purpo
On Thu, Sep 17, 2009 at 1:25 PM, Mark Volkmann
wrote:
>
> On Thu, Sep 17, 2009 at 11:12 AM, John Harrop wrote:
>>
>> Not with ref-set! or alter!, but maybe with commute identity?
>
> I should have been more clear above. What I meant was that multiple
> concurrent transactions cannot write the sa
Hi folks!
I just subscribed to this list and hope we gain some hacking
experience together.
I walked a long way since I decided to go beyond OO: rediscovered CL,
then went to ML family for a couple of years, then Haskell, and back
to dynamic setting via Erlang to Lisps of today. I consider mysel
On Thu, Sep 17, 2009 at 11:12 AM, John Harrop wrote:
> On Thu, Sep 17, 2009 at 11:04 AM, Mark Volkmann
> wrote:
>>
>> On Thu, Sep 17, 2009 at 9:57 AM, Chouser wrote:
>> >
>> > On Thu, Sep 17, 2009 at 12:28 AM, Krukow wrote:
>> >>
>> >> Final question. The docs say that 'ensure' permits more co
On Thu, Sep 17, 2009 at 11:04 AM, Mark Volkmann
wrote:
> On Thu, Sep 17, 2009 at 9:57 AM, Chouser wrote:
> >
> > On Thu, Sep 17, 2009 at 12:28 AM, Krukow wrote:
> >>
> >> Final question. The docs say that 'ensure' permits more concurrency
> >> than promoting the ref to a write. Is there a quick/
As a Java programmer coming to Clojure I would be very interested in the
intended application. How you approach that from a Clojure perspective is
what I'm interested in. I've programmed in Lisp in the distant past
(Symbolics Lisp machines) and still have very found memories of that
environment.
Oh. And just as a quick other question, do global bindings affect
threads which are started in the same ns?
Like
(binding [*global* 2]
(with-thread
(print *global*) ;;prints 2???
))
On Sep 17, 11:33 am, Gorsal wrote:
> Basically i need to redefine the meaning of a special form. While i
Basically i need to redefine the meaning of a special form. While i am
willing to change the name for things like ns to defpackage, i am not
willing to change the name of forms like apply and defn to achieve my
goals. Instead, i would like to redefine them for my own needs. Of
course, i will be us
Java does get a bad rap these days and it can be difficult to spend
time learning something that you are not excited about. Here is a
little more encouragement.
I was recently working on a Project Euler problem involving prime
number generation. My initial pure Clojure implementation took about
1
On Sep 11, 7:55 pm, Fogus wrote:
> Even more information here:
> https://www.assembla.com/spaces/clojure-contrib/tickets/19-Re-add-auto-agent-clj
I should point out that auto-agents, which I wrote, is NOT Cells.
It's just a quick hack that I whipped up as an example of using
watchers. The origi
On Sep 16, 10:46 pm, Hugh Aguilar wrote:
> My concern right now is that I don't know Java. Is this a prerequisite
> for learning Clojure? Can I program in Clojure without delving into
> Java, or are there certain things that will require Java?
Yes, you can learn Clojure the language without know
On Sep 17, 7:50 am, Philipp Meier wrote:
> I'm building a REST server library on top of compojure loosely modeled
> after the ideas of erlangs webmachine. The idea is to describe a
> resource using a couple of function which server as decision makers
> for the different stages of HTTP request pro
On Thu, Sep 17, 2009 at 12:28 AM, Krukow wrote:
>
> Final question. The docs say that 'ensure' permits more concurrency
> than promoting the ref to a write. Is there a quick/simple way of
> explaining how? (Or do I need to go to the source :-)
If you have multiple transactions ensuring the same
On Thu, Sep 17, 2009 at 9:57 AM, Chouser wrote:
>
> On Thu, Sep 17, 2009 at 12:28 AM, Krukow wrote:
>>
>> Final question. The docs say that 'ensure' permits more concurrency
>> than promoting the ref to a write. Is there a quick/simple way of
>> explaining how? (Or do I need to go to the source
On Wed, Sep 16, 2009 at 11:28 PM, Krukow wrote:
>
> Final question. The docs say that 'ensure' permits more concurrency
> than promoting the ref to a write. Is there a quick/simple way of
> explaining how? (Or do I need to go to the source :-)
When you call ensure on a Ref, the current LockingTr
I'll add my two cents.
You sound like you already program, so basic Java knowledge is useful
with Clojure, but not necessary. You can pick up what you need to know
as you learn Clojure. You will find hooks into Java are a lot more
pleasant than interfacing with C and C++. I'm saying that one f
Hi
Thanks for the reply. I understand the code that you have given.
Actually I also wanted it to be stored into some variable (if not the
same) everytime I run it.
Suppose I am matching for keyword "brown" and I want to store
everything after "brown". So for that purpose I wanted to chop off
ever
Aridaman,
> I am very new to clojure and have worked previously on C/C++
>
> I wanted to do some string operations, where I can match occurrence of
> a particular string. However, I get this error everytime.
>
> java.lang.ClassCastException: clojure.lang.Var cannot be cast to
> java.lang.CharSeq
Thanks for the encouragement. I've already got the book.
I suppose eventually I will have to learn Java. I have been putting it
off because I hear a lot of Java-bashing from programmers, and have
also noted that this is generally the impetus for the development of
languages such as Clojure and Sc
Hi everyone
I am very new to clojure and have worked previously on C/C++
I wanted to do some string operations, where I can match occurrence of
a particular string. However, I get this error everytime.
java.lang.ClassCastException: clojure.lang.Var cannot be cast to
java.lang.CharSequence (myse
On Thu, Sep 17, 2009 at 4:46 AM, Hugh Aguilar wrote:
> My concern right now is that I don't know Java. Is this a prerequisite
> for learning Clojure? Can I program in Clojure without delving into
> Java, or are there certain things that will require Java?
I for example am not really big on Java
Hi,
I'm building a REST server library on top of compojure loosely modeled
after the ideas of erlangs webmachine. The idea is to describe a
resource using a couple of function which server as decision makers
for the different stages of HTTP request processing. There will be a
function to determin
2009/9/17 Phil Hagelberg :
>
> Rick Moynihan writes:
>
>> I'm using the latest clojure-mode with slime, (setup through
>> clojure-install) and have started playing with clojure-test-mode.
>>
>> Unfortunately it doesn't appear to display the test results
>> anywhere... Though it does appear to ru
On Thu, Sep 17, 2009 at 6:28 AM, Krukow wrote:
>
>
>
> On Sep 16, 10:06 pm, Rich Hickey wrote:
>> On Sep 16, 11:39 am, Stuart Halloway
>> wrote:
>>
>> > The docs could be more clear, but if validate-fn must be side effect
>> > free then it certainly can't look at any other refs.
>>
>> Yes. The
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