To relate this example to the OP's request for a concurrency example:
The Clojure versions shown below, if they are correct at all, are correct in
the face of concurrency.
The Java version is not generally correct, and cannot be made correct without
switching to Clojure's interfaces and persistent data structures (or something
like them but in name).
Stu
> Oh, I see you put the word "concurrency" in the subject but don't
> mention it in your post. I guess my example isn't interesting for you,
> then. You will get better responses if you put all relevant
> information in the actual body - the subject is a space to summarize
> the body, not to add to it.
>
> On Sep 20, 9:08 am, Alan <a...@malloys.org> wrote:
>> A few days ago I was thinking about how different it would be to write
>> flip-map* in Java vs Clojure. A very simple, small program, but easy
>> to see how Clojure can be more expressive.
>>
>> public static Map<V,K> flipMap(Map<K,V> map)
>> {
>> Map<V,K> result = new HashMap<V,K>(map.size());
>> for (K key : map.keys()) {
>> result.put(map.get(key), key);
>> }
>>
>> return result;
>>
>> }
>>
>> (def flip-map #(apply zipmap ((juxt vals keys) %)))
>>
>> * Given a hash map, reverse its keys and values such that every K=>V
>> pair in the input map becomes V=>K in the output. Naturally the values
>> must be unique for this to work, so call that a precondition.
>>
>> On Sep 17, 2:47 pm, anderson_leite <anderson...@gmail.com> wrote:
>>
>>> I'm new to clojure, so sorry if this is a dummie question.
>>
>>> Studyng clojure I can understand the syntax and so on....but I would
>>> like a real example comparing clojure and java.
>>
>>> Do you know some benchmark using first just java and than showing the
>>> best results with clojure ?
>>
>>
>
> --
> 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
--
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
