On May 22, 2010, at 10:00 AM, mikel wrote:
Trying to get from here:
#{#{[3 2] [5 4] [3 3] } #{[4 3] [5 4] [3 3] } #{[3 2] [2 2] [3 3] } }
to here:
#{[3 2] [5 4] [4 3] [2 2] [3 3] }
that is, combining the set of sets into one set.
(apply clojure.set/union #{#{[3 2] [5 4] [3 3]} #{[4 3] [5
On May 18, 2010, at 10:45 AM, Christophe Grand wrote:
(every? f coll1 coll2) is not supported.
Is there a reason for this? It seems like an obvious improvement to make
every?, some, etc. take multiple args just like map.
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On May 15, 2010, at 4:56 PM, islon wrote:
I'm working in a simple single-thread console-based rpg game in
clojure (a port from my own scala version)
and didn't want to use any concurrency structure because the game is
single threaded.
I was thinking about a macro like
(defmacro set!! [s
It appears the (:key map) style is more common than (map :key) among
Clojurians. Is this true?
So far I'm doing (map :key) because it's more familiar, and because it doesn't
make me change styles when using something besides keywords as keys (admittedly
rare so far). But I'd like to hear other
On May 11, 2010, at 12:39 PM, Alexandre Patry wrote:
I am trying to call a java method using apply, like :
(apply .println [System/out hello world])
But I get an error: Unable to resolve symbol: .println in this context
Am I missing something?
Unfortunately, Java methods are not
On Apr 30, 2010, at 6:33 AM, Rich Hickey wrote:
Would contains-val? be fast for sets? As a user of sets, I consider them
collections of values, and I absolutely would reach for contains-val? in any
library that had it, for use with sets. If so, and I used contains-val?, and
I moved code
On Apr 29, 2010, at 3:21 AM, ataggart wrote:
I know it won't matter, but for posterity if nothing else...
Functions named contains-key? and contains-val? would make a lot more
sense to me than the current contains? and new seq-contains?. Anyone
looking at contains-val? should expect it to
On Apr 19, 2010, at 4:52 PM, uap12 wrote:
(defn -main
(make-lotto))
([] (-main )))
You're missing the empty arglist in your definition of -main. It should be:
(defn -main []
(make-lotto))
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On Apr 9, 2010, at 10:39 AM, Josh Stratton wrote:
Here's an example of trying to use map to bring the two tables
together together in the same scope. I'm doing this because the nth
element in one sequence correlates to its nth counterpart in the
second sequence. mainTables is a sequence of
On Apr 6, 2010, at 9:01 AM, Laurent PETIT wrote:
* BUT : isn't the real problem that one will not content
[him/her]/self with playing with in-memory data ? One will want to
make the data persistent (outside-of-process, aka
storage-persistance). And with this kind of problem, one will have
On Apr 6, 2010, at 6:08 PM, Sophie wrote:
Don't you think
- fixed-order named parameters
could (should?) be a separate issue from
- optional, any-order, named parameters
?
I don't see the advantage of fixed-order named parameters over keyword
parameters. Note that you can require certain
On Apr 5, 2010, at 2:09 AM, Sophie wrote:
(deftype Account [owner balance])
(deftype Person [accounts])
joe has 1 account.
How to I create / initialize joe the account with mutual references?
I'd rather not use refs.
You can't do it directly without one of the two being mutable. But
On Apr 5, 2010, at 7:49 AM, Sophie wrote:
Is this a Clojure restriction, or is it intrinsic to functional
programming?
It's a consequence of immutable data structures, which are an aspect of
functional programming. An immutable object can never be changed, and you can't
create multiple
On Apr 5, 2010, at 4:34 PM, Sophie wrote:
But single-assignment is a quite valid (and more flexible?) form of
immutability. I'm not convinced cycles are intrinsically tied to it in
any way.
If you can assign to it, it's mutable. What you're talking about is creating a
mutable object, then
On Mar 19, 2010, at 6:07 AM, TimDaly wrote:
(defn cmdresult [cmdstr]
(let [args (into [] (seq (.split cmdstr )))]
(BufferedReader.
(InputStreamReader.
(. (. (. Runtime (getRuntime)) (exec args))
(getInputStream))
Why do (into [])? .exec expects a String[], exactly what
On Mar 19, 2010, at 12:54 PM, Greg Fodor wrote:
Very simple function:
(defn map-filter [f coll]
(map f (filter f (coll)))
You have an extra parenthesis before coll.
Is there an API function for this that I am missing? For example, it
is useful for pulling out all values in a list of
On Mar 18, 2010, at 10:55 AM, Per Vognsen wrote:
Is there any reason why a .method occurrence in non-operator position
doesn't just do the closure wrapping automagically?
I'd like to know this as well. Smooth Java interop is one of Clojure's selling
points, but having to wrap Java methods in
On Mar 18, 2010, at 4:17 PM, David Nolen wrote:
On Thu, Mar 18, 2010 at 4:25 PM, alux alu...@googlemail.com wrote:
Hello!
I much enjoyed reading the tutorial http://www.lisperati.com/casting.html
, mentioned by eyeris today. The most mind-extending thing (to me,
having Java background) is
I noticed that when I set JAVA_TOOL_OPTIONS, clojure outputs the following to
STDERR before it runs my code:
Picked up JAVA_TOOL_OPTIONS: ...
This interferes with e.g. running clojure scripts as cron jobs, since it's
common to rely on the presence of output on STDERR to signal errors.
On Mar 10, 2010, at 12:20 PM, Glen Rubin wrote:
However, the output of my trips function yields multiple collections
of vectors inside of a larger vector. I am completely befuddled as to
how to process this behemoth.
You can merge the structure into a single list of triples by applying
On Mar 8, 2010, at 1:06 PM, Nurullah Akkaya wrote:
Using this,
http://paste.lisp.org/display/67182
would allow you to do,
(let [config {:str fred :beg 2 :end 3}]
(apply (jfn 'substring) (map config [:str :beg :end])))
That's quite nice. Thanks!
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On Mar 8, 2010, at 11:20 PM, Michał Marczyk wrote:
It's simple to write this way... And if you provide type hints, I'd
expect the resulting function to be quite performant. If you don't
care about that, here's a flexible alternative using eval:
user (defmacro methodfn [name]
`(fn [
Given a Java instance 'store' with a .connect method that takes a host, port,
user and password, and given a hash-map 'config' with corresponding keyword
values, I wanted to do something like:
(apply .connect store (map config [:host :port :user :password]))
rather than:
(.connect store
On Mar 8, 2010, at 9:16 AM, Adrian Cuthbertson wrote:
Maybe just;
(let [{:keys host port user password} config]
(.connect store host port user password))
Having to repeat the variable names rather defeats the purpose, since this
version is longer than the original and still feels redundant
As part of a project to help me learn Clojure, I'm trying to send an
email using code like
http://nakkaya.com/2009/11/10/using-java-mail-api-from-clojure/.
For the JavaMail API I'm using GNU JavaMail, which in turn requires
GNU JAF (activation.jar). When I try to run my program, I get:
On Mar 3, 2010, at 8:42 AM, Michael Wood wrote:
On 2 March 2010 17:40, Michael Gardner gardne...@gmail.com wrote:
As part of a project to help me learn Clojure, I'm trying to send an
email using code like
http://nakkaya.com/2009/11/10/using-java-mail-api-from-clojure/.
For the JavaMail API
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