Either this, or use the "when" form.
http://clojuredocs.org/clojure_core/clojure.core/when
2011/7/11 Tassilo Horn :
> Antonio Recio writes:
>
> Hi Antonio,
>
>> I get the error "Too many arguments to if" with this. Do you have any
>> suggestion?
>
> `if' expects exacly one test, one then-form, an
Shantanu Kumar wrote:
> On Feb 17, 3:05 pm, Roman Roelofsen
> wrote:
>
>> Hi,
>>
>> does someone knows a good Clojure REST framework? It should help with
>> URL destructuring and maybe creating JSON return data etc.
>>
>
> You can t
Hi,
does someone knows a good Clojure REST framework? It should help with
URL destructuring and maybe creating JSON return data etc.
Cheers,
Roman
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> It doesn't work because the scope of lname# is limited to the `().
> However lname is used in a ~@() which leaves the `() and enters the
> enclosing environment (in this case the macros). There the lname# is
> not valid.
Ah, that makes sense, thanks! Is using (gensym) the common solution
here? S
> I don't see a compelling reason for such a macro. At least not in this
> simple case.
I agree. As I said, the purpose of this macro was purely for learning
and understanding macros ;-)
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Hi,
just for practicing Clojure's macros I wrote the following
create-java-list macro.
(defmacro create-java-list
[& forms]
(let [prefixfn (fn [obj form] (cons (symbol ".") (cons obj form)))
lname (gensym)]
`(let [~lname (java.util.ArrayList.)]
~@(map (partial prefixfn lnam
Hi,
when querying data in clojureql, the result is a list of maps. I often
directly return this list (or a map) from my "db-logic" functions
because my domain logic operates on these maps. However, I am not able
to go the other way around, e.g. take the map and tell clojureql to
insert/update a ta
2010/1/25 Mark Engelberg :
> Debugging techniques, including:
> * How to make sense of Clojure's stack traces.
> * How to use Java debugging and profiling tools with Clojure.
+1
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> Talking of semantics, do you think the one I enumerated would work?
> I'll certainly try to implement this concept, but I have many other
> projects on the table right now, so it might take a while before I
> start working on it.
Yes, it looks good. The key thing is that all users/developers agr
Dealing with version numbers at build time is quite easy with tool
like Maven. The important thing is that everyone agrees on the same
version semantics (great summary [1]). Putting some more tooling
around this should be a good idea, yes.
However, the problem in Java is dealing with versions at r
It seems that Clojure heavily uses the ContextClassLoader to load
classes and compile clj files. Is there a way to disable this
behaviour and tell the Clojure runtime to always use the ClassLoader
where the .clj or .class file originally came from?
I found some flags in the RT class but I am not s
Are there any plans to add -$> to core or contrib?
2009/11/13 Laurent PETIT :
> Oh yes, thanks for refreshing my memory.
> And indeed it makes sense to place the question mark in the "questioned" side
> :)
>
> 2009/11/13 Wilson MacGyver :
>> Yes, it's groovy, and it's "?." It's called safe naviga
I am a Linux user as well and this indeed sounds a bit alarming (but I
haven't tested it on my machine yet, though...) Does somebody has a
bit more information about the reason, current state, etc.?
Thanks!
2009/11/28 David Brown :
> This commit:
>
> commit 5577a47a390782d7ab911c2e3c4c8be1b03
d of "clojure-
> lang", i.e. http://build.clojure.org/org/clojure/clojure/maven-metadata.xml
>
> That URL doesn't work.
> -SS
>
>
> On Nov 4, 10:50 am, Roman Roelofsen
> wrote:
>> It seems that only directory listings are disabled since
>>
>>
It seems that only directory listings are disabled since
http://build.clojure.org/org/clojure/clojure-lang/maven-metadata.xml
is accessible.
Roman
2009/11/4 Stuart Sierra :
>
> I don't think that URL works as a Maven/Ivy repository, because
> http://build.clojure.org/org/clojure doesn't exist.
Do you mind sharing the links? I am interested in it as well.
Thanks!
Roman
2009/10/28 Tony Butterfield :
>
> Tom Hicks has just pointed me to an old thread which answers
> questions about namespaces and isolation. Let me read and
> absorb all that work first - I suspect it answers a lot of my
2009/10/12 Christophe Grand :
> On Mon, Oct 12, 2009 at 12:00 PM, Roman Roelofsen
> wrote:
>>
>> > Plus, if you use a shared loader for most interfaces, clojure instances
>> > will
>> > be able to share persistent data and closures.
>>
>> Nop
> Plus, if you use a shared loader for most interfaces, clojure instances will
> be able to share persistent data and closures.
Nope, I tried this and it didn't work. The classloader explicitly
complained that e.g. Var and RT have not been loaded by the same
classloader :-/
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@Mark: I doubt that this will work. Unloading a namespace would mean
to remove a class from a classloader and this does not work in Java.
OSGi handles this by removing the bundle's classloader completely.
@All: The huge added value that OSGi still has is multi-version
support. Lets say I want to
Hi,
I am currently working on a Clojure / OSGi integration: www.ogeesource.org
The goal is to extend Clojure with a module-like runtime, not to fully
convert Clojure and Clojure-based applications to OSGi (which would be
quite hard anyway).
So far you can add new modules at runtime and therefor
Thanks for the explanation!
So the solution is much simpler:
user=> (-> person :childs first (select-keys [:name]))
{:name "Son"}
Cool :-)
On Sep 22, 3:26 pm, Jarkko Oranen wrote:
> On Sep 22, 3:58 pm, Roman Roelofsen
> wrote:
>
>
>
> > Hi the
Hi there!
Lets assume I have this map:
user=> (def person {:name "Father" :childs [{:name "Son" :age 10}]})
Testing:
user=> (-> person :childs first)
{:name "Son", :age 10}
Now lets filter the child map:
user=> (def only-name (fn [m] (select-keys m [:name])))
user=> (-> person :childs first
Thanks a lot to everbody for the great responses! They certainly helped
a lot!
Cheers,
Roman
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Hi all!
I've been playing around with Clojure in the last couple of days. Very
interesting! However, I have never used a non-OO, lispy, pure
functional language before and several questions popped up while
digging deeper into the Clojure world. I hope you don't mind if I post
them together in one
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