On Sun, 22 Mar 2009 at 23:27, Jeff Valk wrote:
> Ah, golf... :-)
>
> (defn mapmap [f m]
> (into {} (for [[k v] m] [k (f v)])))
For the record, I think the original approach is the most clear. And it's
actually shorter.
(defn mapmap [f m]
(zipmap (keys m) (map f (vals m
--~--~---
Clojure is not a pure functional programming language. It allows side-
effects everywhere.
On Mar 22, 3:26 pm, Joshua Fox wrote:
> I dove into Lisp and Scheme several times in the past, but only with Clojure
> did Lisp really "catch"?
> 1. Clojure abandons the 1950's cruft, with all-caps and ab
I'd like to remind people using Clojure and Maven that they can get
nightly builds of Maven via the Tapestry360 maven snapshot repository:
http://tapestry.formos.com/maven-snapshot-repository
To access the nightly snapshot in Maven, you must update your
pom.xml's element (creating it as necessa
ooh for
On Sun, Mar 22, 2009 at 9:27 PM, Jeff Valk wrote:
>
> On 22 March 2009 23:14, Timothy Pratley wrote:
>
>> Golf time!
>>
>> (defn mapmap [f m]
>> (into {} (map (fn [[x y]] [x (f y)]) m)))
>
> Ah, golf... :-)
>
> (defn mapmap [f m]
> (into {} (for [[k v] m] [k (f v)])))
>
> >
>
--
Maven also downloads jars and dependencies automatically as a typical part
of its functionality. It typically saves them in
"${user.home}/.m2/repository-.jar"
The naming is pretty consistent because maven strongly encourages everyone
to use the same conventions. (javadoc would be in the same
On 22 March 2009 23:14, Timothy Pratley wrote:
> Golf time!
>
> (defn mapmap [f m]
> (into {} (map (fn [[x y]] [x (f y)]) m)))
Ah, golf... :-)
(defn mapmap [f m]
(into {} (for [[k v] m] [k (f v)])))
--~--~-~--~~~---~--~~
You received this message becaus
Golf time!
(defn mapmap [f m]
(into {} (map (fn [[x y]] [x (f y)]) m)))
On Mar 23, 2:51 pm, Kevin Downey wrote:
> (defn mapmap [fn m]
> (into {} (map #(vector (first %) (fn (second %))) m)))
--~--~-~--~~~---~--~~
You received this message because you ar
>
>
> my programming language enchilada (www.enchiladacode.nl)
interesting. I was thinking today about how STM reminds me of version
control.
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You received this message because you are subscribed to the Google Groups
"Clojure" group.
To pos
(defn mapmap [fn m]
(into {} (map #(vector (first %) (fn (second %))) m)))
On Sun, Mar 22, 2009 at 1:10 PM, Jon Nadal wrote:
>
> I often need to map a function over the values of a map while
> preserving keys--something like:
>
> [code]
> (defn mapmap [fn m]
> (let [k (keys m)
> v (m
i think it would be awesome if someone worked up a scenario . . . started
using regular old java . . . and we could walk into a few gotchas,
publicly/transparently, where a serious java guy could chime in ... and
really see what the stm buys. Then we'd have an even richer appreciation
for the STM
I dove into Lisp and Scheme several times in the past, but only with Clojure
did Lisp really "catch"?
1. Clojure abandons the 1950's cruft, with all-caps and abbreviations like
SETQ and CDR. However, Scheme does this too, without achieving the ease of
Clojure.
2. Clojure is typically illustrated
I often need to map a function over the values of a map while
preserving keys--something like:
[code]
(defn mapmap [fn m]
(let [k (keys m)
v (map fn (vals m))]
(zipmap k v)))
(mapmap inc {:a 0, :b 1})
[/code]
Is there a more concise way to do this in Clojure? If not, is this
some
Bradbev writes:
> I feel that the next big growth phase for Clojure will be in the user
> community and the code that we can generate. A good package manager
> will help fuel that growth.
I agree. The more I work with packages that have dependencies the more I
realize that manually managing th
On Sun, Mar 22, 2009 at 9:05 PM, Stephen C. Gilardi wrote:
>
> On Mar 22, 2009, at 4:43 PM, Meikel Brandmeyer wrote:
>
>> Is .?. necessary? -> does the same job as .. by
>> virtue of the .method notation, but is more general.
>> So, why not get rid of .. and .?. completely?
>
> That sounds right
Could you throw this on github, so we can easily follow along with
improvements?
On Mar 22, 8:25 pm, "zoglma...@gmail.com" wrote:
> While playing around and implementing straight up Humman compression,
> I wrote a handful of utilities to conveinently play with byte and bit
> streams because I di
I'm trying to understand the degree to which Clojure's STM provides
more concurrency than Java's blocking approach. I know it's difficult
to make generalizations and that specific applications need to be
measured, but I'll give it a go anyway.
Clearly using STM (dosync with Refs) makes code easie
Michael Wood writes:
>
> Are you sure it's not trying to use gcj instead of Sun java?
>
> What do "java -version" and "javac -version" give you? And does
> "update-alternatives --list java" or javac print anything?
java -version:
OpenJDK Runtime Environment (build 1.6.0_0-b11)
OpenJDK Server
On Mar 22, 2009, at 4:43 PM, Meikel Brandmeyer wrote:
Is .?. necessary? -> does the same job as .. by
virtue of the .method notation, but is more general.
So, why not get rid of .. and .?. completely?
That sounds right to me, Meikel. I'm in favor of keeping only -?> .
--Steve
smime.p7s
De
On Mar 22, 2:34 pm, Frantisek Sodomka wrote:
> (defn f [#^Double x] (+ x 2)) => #'user/f
> (f 3) => 5
> (f nil) => java.lang.NullPointerException (NO_SOURCE_FILE:0)
> ; why NPE?
nil is Java null. The Clojure "+" function eventually compiles to
Java "+", which throws an exception on null.
> (f
While playing around and implementing straight up Humman compression,
I wrote a handful of utilities to conveinently play with byte and bit
streams because I didn't see anything too helpful in the mmap and
duck_stream files.
What I wrote would need to be changed to better work with the existing
c
On Mar 22, 12:57 pm, Bradbev wrote:
> Is the clojure-contrib portion of Clojure meant to act as a package
> system like Cabel, CPAN, etc? I suspect not. Clojure-contrib is more
> like the standard library that comes with Clojure.
Speaking as a contributor, I don't think it's big enough to qual
Many of you may be familiar with the "Java Posse" podcast. Their
website is http://javaposse.com/. Near the end of the most recent
episode, #235, they mentioned my Clojure article and provided a link
on their website. So more press for Clojure!
BTW, I have made many updates to the article since I
Thanks again to all for the help, clj-cont now supports the new and dot
special forms. This also means that dosync, doto, .. all work perfectly
fine from within a with-call-cc form.
You can now write things like this:
(let [cc (atom nil)]
[(with-call-cc
(. (let-cc k
(reset! cc k)
(k
Well it seems to be more complicated than that, defining a visit
method overrides the call to the visit(CompilationUnit n, A arg)
method which contains the basic visitation logic, what that
I actually need is a way of overriding specific methods (like the visit
(MethodDeclaration n, A arg) and no
Thanks for the comments, folks. I may be able to raw some ideas from
them. In my specific case, restrictive rules about the types of the
objects may be quite workable. For example, I don't think I'd suffer
if the state-preserving objects were all required to be hash-maps.
I'll think some more abo
I was hoping that we could piggy-back on one of Java's packaging
systems, so our programs can depend on Java libraries just as easy as
Clojure libraries. And in this regard, the Maven repository system is
pretty popular and even supported by build tools other than Maven
(such as Ivy, Buildr and Gr
That was it! At one point I knew these things. Thanks much.
On Sun, Mar 22, 2009 at 2:18 PM, Eric Tschetter wrote:
>
> > (let [myref (ref {})]
> > (dot
> >clojure.lang.LockingTransaction
> >(list 'runInTransaction (fn [] (commute myref assoc :mykey :myval)
> > I'm getting a instanc
Hi,
Am 22.03.2009 um 20:45 schrieb Stephen C. Gilardi:
clojure.contrib.core/.?. is a symbol. Thanks for pointing out that
it is one that's reserved to Clojure.
Rich, should we rename clojure.contrib.core/.?. to avoid using a
name reserved to Clojure?
I'd like to throw in another thought:
How would I do that? Make a macro that expands into a map literal
with the appropriate calls to .get, .getShort and .getInt?
On Mar 22, 4:20 pm, Christophe Grand wrote:
> Vincent Foley a écrit :> The code is available at this
> URL:http://code.google.com/p/bwhf/
> > (look at the hu.becliza.and
Vincent Foley a écrit :
> The code is available at this URL: http://code.google.com/p/bwhf/
> (look at the hu.becliza.andras.bwhf.control.[BinRepParser,
> BinReplayUnpacker] files)
>
> It is definitely not as dynamic, which helps quite a lot, but I wanted
> to have something high level and declara
Thanks for the responses:
I read into proxy-super, and it fulfills my needs.
But I'm worried about my current approach for multi-methods now:
As Mark put it:
"Not only is it clumsy, but if mymethod returns a fresh object that
is
based off of this object in some way (e.g., a non-destructive
"sett
On Mar 22, 2009, at 2:28 PM, Michael Wood wrote:
As was pointed out to me recently, http://clojure.org/reader says:
"Symbols beginning or ending with '.' are reserved by Clojure."
So, is .?. not a symbol (because it's called at compile time and at
runtime there is no such thing as .?.)? i.e.
Clojure's great, thanks very much for making it available & supporting it!
Anand
On Fri, Mar 20, 2009 at 6:26 PM, Rayne wrote:
>
> I Anthony Simpson, with the support of fellow Clojurists hereby
> declare March 20th, the first day of spring, Rich Hickey appreciation
> day!
>
> Rich Hickey has ce
I had started on something like a package manager called Sauron ("one
library to rule them all"). My idea was to be able to define dependencies
with something like:
(depends-on :name "clojure-json" :version "1.2.3")
This would look into a ~/.sauron directory and either add a jar or a
directory to
Hello Rich & everybody!
clojure.set/union currently accepts 'nil' as a valid argument:
(union nil) => nil
(union nil nil) => nil
(union nil #{1 2}) => #{1 2}
(union #{1 2} nil) => #{1 2}
(union #{} nil) => #{}
(union nil #{}) => nil ; not consistent
Possible solution would be to ban 'nil
On Sun, Mar 22, 2009 at 11:42 AM, Laurent PETIT wrote:
> OK, Stephen checked this in, thank you very much !
>
> Two new symbols:
As was pointed out to me recently, http://clojure.org/reader says:
"Symbols beginning or ending with '.' are reserved by Clojure."
So, is .?. not a symbol (because i
> (let [myref (ref {})]
> (dot
> clojure.lang.LockingTransaction
> (list 'runInTransaction (fn [] (commute myref assoc :mykey :myval)
> I'm getting a instance method not found exception which seems odd. I looked
> at LockingTransaction.java and I see that runInTransaction does in fact
Thanks all for the pointers, this looks like a workable approach. In my
case I'm not bothered by the performance hit from reflection (CPS
transformation creates an obscene number of anonymous functions anyway).
However I am running into an issue. Here's my dot function:
(def not-seq? (comp not se
Is the clojure-contrib portion of Clojure meant to act as a package
system like Cabel, CPAN, etc? I suspect not. Clojure-contrib is more
like the standard library that comes with Clojure. I think that going
forward, Clojure is going to want to have a large and easily
accessible library of packa
On Mar 22, 5:10 pm, Stuart Sierra wrote:
> On Mar 21, 4:38 pm, CuppoJava wrote:
>
> > For proxies, I haven't figured out a way yet.
>
> Proxies cannot call superclass methods. Classes generated with gen-
> class can. However, if you regularly need to call superclass methods
> instead of subcla
On Mar 21, 6:01 pm, rapido wrote:
> my programming language enchilada (www.enchiladacode.nl) has
> hash=pointer equality build in.
> i believe it shouldn't be to difficult to introduce some of
> enchilada's internals to clojure.
Hi Robbert,
I imagine that hash-pointer equality would be difficul
On Mar 21, 6:13 pm, ronen wrote:
> Hello there,
> Iv been trying to implement a proxy on a class
> (http://code.google.com/p/javaparser/source/browse/trunk/JavaParser/sr...)
> that has multiple overloaded methods (same arity different types),
> trying
>
> (defn create-visitor []
> (proxy [Void
On Mar 22, 10:34 am, Mark Volkmann wrote:
> (defn get-output [fn]
> (let [sw (StringWriter.)]
> (binding [*out* sw] (fn))
> (.toString sw)))
This is what clojure.core/with-out-str does.
-Stuart Sierra
--~--~-~--~~~---~--~~
You received this message beca
On Mar 21, 4:38 pm, CuppoJava wrote:
> For proxies, I haven't figured out a way yet.
Proxies cannot call superclass methods. Classes generated with gen-
class can. However, if you regularly need to call superclass methods
instead of subclass methods, then you may want to rethink your design,
p
On Mar 21, 10:23 pm, Timothy Pratley wrote:
> You may be able to achieve what you want by directly accessing
> Clojure's reflector class instead of using the special form:
You could also call Java's reflection API directly.
-Stuart Sierra
--~--~-~--~~~---~--~~
Yo
Seriously, Rich, you are awesome. Great language.
BTW. Does Rich have an Amazon wish list?
On Mar 20, 11:26 am, Rayne wrote:
> I Anthony Simpson, with the support of fellow Clojurists hereby
> declare March 20th, the first day of spring, Rich Hickey appreciation
> day!
>
> Rich Hickey has certa
Never mind. I think I needed to make this a macro instead of a
function like this:
(defmacro get-output [fn]
`(let [sw# (StringWriter.)]
(binding [*out* sw#] ~fn)
(.toString sw#)))
On Mar 22, 9:34 am, Mark Volkmann wrote:
> I can't figure out why this function seems to work, but also
I can't figure out why this function seems to work, but also produces
a NullPointerException.
(defn get-output [fn]
(let [sw (StringWriter.)]
(binding [*out* sw] (fn))
(.toString sw)))
(get-output (println "foo"))
--
R. Mark Volkmann
Object Computing, Inc.
--~--~-~--~~--
On Mar 19, 12:58 pm, Jason Sankey wrote:
> Also, is there somewhere I can contribute test cases for this to
> prevent a future regression?
Tests for clojure.zip can from now on go to test-clojure.clojure-zip:
http://code.google.com/p/clojure-contrib/source/browse/trunk/src/clojure/contrib/test_c
Thanks for looking this over! It's interesting how often I find myself
trying to use an Atom because I'm not coordinating changes multiple
things, just one, but the solution still requires using a Ref. I guess
it's wrong to think of what I'm doing as coordinating one value. I'm
really coordinating
Hi,
Am 21.03.2009 um 23:26 schrieb Mark Volkmann:
I'm looking for a suggestion on how I can get new-struct.
The other aspects aside, here an answer for this question.
(defn get-new-struct
[the-new-map]
(the-new-map (last (keys the-new-map
Or, to be sure,
(defn get-new-struct
[the
I join the crowd too,
I was looking for a language to develop some projects. Then Clojure
appeared, the light was there.
Thank you Rich Hickey
Stephane
On Mar 20, 2:26 pm, Rayne wrote:
> I Anthony Simpson, with the support of fellow Clojurists hereby
> declare March 20th, the first day of spr
OK, Stephen checked this in, thank you very much !
Two new symbols:
clojure.contrib.core/.?.
clojure.contrib.core/-?>
Regards,
--
Laurent
2009/3/14 Laurent PETIT
> Issue 34 ( http://code.google.com/p/clojure-contrib/issues/detail?id=34 )
> created with patch (both -?> and .?. defined in c
On Mar 21, 2009, at 11:30 PM, Mark Triggs wrote:
>>
>
> Yep, that's fine. In my case I was actually relying on the fact that
> `str' was effectively doing a `prn-str' because I would later read it
> back using `read-string' elsewhere. Calling `prn-str' explicitly
> isn't a problem--I just though
Hi David,
On Mar 22, 5:01 pm, David Sletten wrote:
> On Mar 21, 2009, at 1:44 PM, Mark Triggs wrote:
>
> > user=> (str (filter even? (range 1 10)))
> > "clojure.lang.lazy...@f1005"
>
> > Previously this would readably print the contents of the seq and some
> > of my code was relying on this.
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