[ANN] Funcgo: writing Clojure using a Go-like syntax
Announcing Funcgo (Functional Go), a new language with a Go-like syntax
that compiles to Clojure.
See https://github.com/eobrain/funcgo
As a teaser, here is an example of some code:
func sumSquares(vec) {
loop(accum=0, v=vec) {
if isEmpty(v) {
accum
} else {
x int := first(v)
recur(accum + x * x, rest(v))
}
}
}
sumSquares([3, 4, 5, 10])
=> 150
__
Eamonn
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Re: Clojure embedded in a Java Application
Hi Meikel,Ken
Thank you so much for taking the time to reply to my question. Meikel
Thanks for the code. I will implement as described above.
On Sep 18, 6:28 pm, Meikel Brandmeyer wrote:
> Hi Eamonn,
>
> if you find this too tedious to write and use it quite often, then there is
> always the possibility to hide things a little bit behind a facade.
>
> class Clj {
> static final Var seqVar = RT.var("clojure.core", "seq");
> static final Var keywordVar = RT.var("clojure.core", "keyword");
> static final Var hashMapVar = RT.var("clojure.core", "hash-map");
>
> static Object seq(Object x) { return seqVar.invoke(x); }
> static Object kw(String n) { return keywordVar.invoke(n); }
> static Object kw(String n1, String n2) { return keywordVar.invoke(n1,
> n2); }
> static Object hashMap(Object... args) { return
> hashMapVar.applyTo((clojure.lang.ISeq)seq(args)); }
>
> }
>
> This would make names a little bit more meaningful (less “invoke”s) for the
> functions you use most. And you might use your own function names. Of course
> this won't reach the sugar you get from Clojure itself.
>
> theMap = Clj.hashMap(Clj.kw("a"), 1, Clj.kw("b"), 2);
> foo.invoke(Clj.kw("a"), theMap);
>
> This translates directly into:
>
> (let [the-map (hash-map :a 1 :b 2)]
> (foo :a the-map))
>
> It should be easy to understand what's going on despite the noise. I believe
> Java devs are used to noise.
>
> And FWIW: Not quoting "13rabc" by accident in the other scenario will not
> result in the Reader complaining but puzzled looks where this magical value
> came from. I personally don't particular like these moments.
>
> My 0,02€. YMMV.
>
> Sincerely
> Meikel
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Re: Clojure embedded in a Java Application
Hi Meikel
Thank you for your reply. Is there a way to populate the HashMap
before passing it to the invoke method
I tried the following
Var keyword = RT.var("clojure.core", "keyword");
Var hashMap = RT.var("clojure.core", "hash-map");
hashMap.invoke(keyword.invoke("a"), 1);
then I created the following function
(defn foo[key paramMap](key paramMap))
Object result=foo.invoke(keyword.invoke("a"), hashMap);
But I got null returned but when I do as you suggest
Object result=foo.invoke(keyword.invoke("a"),
hashMap.invoke(keyword.invoke("a"), 1));
I get 1 returned
Any suggestions welcomed
On Sep 16, 9:56 am, "Meikel Brandmeyer (kotarak)"
wrote:
> Hi,
>
> Am Donnerstag, 15. September 2011 23:39:10 UTC+2 schrieb Eamonn:
>
> > The code works BUT if I try to pass in a map for example like so
> > Object result = foo.invoke( "hello","world","#{:a 1 :b 2}");
>
> This does not pass a map to the function, but the string "#{:a 1 :b 2}". And
> from your example I don't see where the class cast exception should come
> from. To create a clojure map use the normal hash-map function.
>
> Var keyword = RT.var("clojure.core", "keyword");
> Var hashMap = RT.var("clojure.core", "hash-map");
>
> foo.invoke("hello", "world", hashMap.invoke(keyword.invoke("a"), 1,
> keyword.invoke("b"), 2));
>
> Hope this helps.
>
> Sincerely
> Meikel
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Clojure embedded in a Java Application
Hi
I'm new to Clojure so forgive me if this is a dumb question. I want
to incorporate some Clojure into a Java application.
String rule="(str key val label)";
String str = "(ns test) " + "(defn foo [key val label] " +
rule +
")";
System.out.println(str);
Compiler.load(new StringReader(str));
// Get a reference to the foo function.
Var foo = RT.var("test", "foo");
// Call it!
Object result = foo.invoke( "hello","world","this is a test");
The code works BUT if I try to pass in a map for example like so
Object result = foo.invoke( "hello","world","#{:a 1 :b 2}");
I always get a ClassCastException. Am I doing something ridiculous
here? Is it possible to pass in a Map from the Java world into the
Clojure code?
Also any comments on using Clojure within a Java app appreciated. Is
it a good idea. I was thinking of allowing rules to be dynamically
added to fields within a web application.
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Re: clojure.contrib.test-contrib.test-jmx build error
I think you're running into http://bugs.sun.com/view_bug.do?bug_id=6924497 which is unrelated to JMX itself but is a problem of incompatibility between the JDK class library and the JVM, if for example you are running with HotSpot Express. A fix should appear in a JDK 6 update but in the meantime it's probably best to change the test so it doesn't tickle this bug. One way to do that would be to look only at MBeans with an ObjectName matching "java.lang:*". Regards, Éamonn McManus, JMX Spec Lead -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
