Dear Clojurians,
We've released a small queuing library which fills a gap that core.async
didn't really fill for us.
https://github.com/acrolinx/clj-queue-by
* A central, easy to use, thread-safe, in-memory working queue.
* Easy to inspect to allow monitoring.
* Stateful, not persistent, uses
Dear Clojure-Community,
The call for proposal for the next :clojureD is open:
http://clojured.de/call-for-proposals/
We'd love to drown in your submissions so that we can deliver a conference
programme just as excellent as 2017. :-)
Oh, and ticket sale has started, too:
Hi,
Doesn't that feel like premature optimization to you, too? Bitmasks are
much harder to read than sets with spelled out roles and I wonder if the
performance gain is really worth that. And it poses a limit of 64 roles. I
have seen several enterprise applications that had far more than 64
Hi,
On Friday, September 16, 2016 at 6:16:14 AM UTC+2, Mars0i wrote:
>
> Glad that this is happening.
> You might want to add the date to the CFP and Schedule pages. I only
> found it on the Press page.
>
Thanks for your feedback. I've added the date to the CfP page. Did you
look for it on
Dear Clojure-community,
Please let me bring the current call for proposals for the next iteration
of the German clojure conference in Berlin, the :clojureD, to your
attention:
http://www.clojured.de/call-for-proposals/
We call to send us talks for the upcoming :clojureD conference 2017.
Good point, Paul. Thanks.
Best,
stefan
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Hi Francis,
Thanks for taking the time to thoroughly explain your approach. I find it
interesting and was not yet aware of it. Need to wrap my head around it a
bit.
Best,
Stefan
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Hi,
Currently, I am in the process of writing a client to server API which is
not trivial to consume. In particular it needs a 3-step authentication
process: login with user name and password, get an authentication token,
open a session with the token and finally consume the API with the
Fellow Clojurians,
The team organizing the German Clojure conference :clojureD would like you
to know, that the registration is now open:
http://www.clojured.de/registration/
Kind regards,
stefan
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On Friday, July 31, 2015 at 8:21:18 AM UTC+2, Raymond Huang wrote:
I'd like to use `add-watch` on an atom which writes the data to a
core.async channel. So far, I've come up with this, but it seems bad
because I create a new go-routine everytime something happens.
Makes me think, one
Dear CIDER Devs,
On Tuesday, June 16, 2015 at 4:33:48 PM UTC+2, Bozhidar Batsov wrote:
CIDER 0.9 is finally out! You can read more about the release here
http://batsov.com/articles/2015/06/16/cider-0-dot-9/
thanks for the time and effort you've put into this! Works fine for me.
Update
Hi,
On Friday, February 13, 2015 at 8:04:20 PM UTC+1, James Reeves wrote:
A lot of utility libraries, such as my own Medley
https://github.com/weavejester/medley, have mapply functions for this
exact use-case.
Generally, however, I find that keyword arguments are more trouble than
Hi,
It's been quite a while since I last looked into the impl of STM but I seem
to remember that the committing transaction actively notifies other running
transactions (see method barge) to restart and thus the restart is not
triggered by the second deref at all.
You could also find out
Hi,
Thanks for your pointers. That is something to dive into.
Cheers,
stefan
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Hi,
Currently, I am trying to write a presentation using ring and reveal.js.
For the code samples, I'd like to write real clojure code, i.e. no
strings or the like.
Then, I want to turn that into a suitable hiccup vector which will create
the correct reveal.js/highlight.js syntax.
I
Hi,
With great pleasure, I'd like to announce the finalization of the program
and opening of registration for the :clojureD, Germany's Clojure conference
in Berlin.
The conference:
http://www.clojured.de/
24th Jan 2015 in Berlin
https://twitter.com/clojuredconf @clojuredconf
The program:
Hi,
Thumbs up from my side. The compilation issues with too long filenames in
my projects on my system are gone now (CLJ-1330). No perf degradation
either :-).
Thanks
Stefan
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Hi,
not directly an answer to your question, but you may be interested in
Seesaw and it binding facilities.
Unless you are looking for pure Java solutions in which case your posting
in the wrong group.
Kind regards,
stefan
On Monday, November 3, 2014 1:52:46 PM UTC+1, Azzoug Youcef wrote:
Hi,
have there been any changes how fns with a name and recursion are
compiled? One of my projects has a function which does not compile with
1.7.0-alpha3 anymore, but did fine with 1.6.0.
I tried to create a minimal example at
https://github.com/ska2342/nested-fn-breaks-clojure-17
(I know
Hi,
On Tuesday, September 30, 2014 12:01:33 PM UTC+2, Joachim De Beule wrote:
Dear list,
I've got two threads that update the same location. One of them takes a
lot of time. Given this, my question is if there is a reason to prefer an
atom or a ref?
is it really just two threads? Then
On Wednesday, September 10, 2014 10:53:27 PM UTC+2, Alex Miller wrote:
On Wednesday, September 10, 2014 11:05:36 AM UTC-5, puzzler wrote:
When I explain to new Clojurists what the ! means, I explain that it
calls attention to a mutation function that is unsafe to call inside a
Practical Common Lisp will definitely help understanding Clojure, too. For
example, the way, Macros are introduced and used, and understanding generic
functions.
http://www.gigamonkeys.com/book/
stefan
On Sunday, August 24, 2014 12:49:07 PM UTC+2, Cecil Westerhof wrote:
There are a lot of
(defn foo
I don't do a whole lot.
[a b]
((let [y (bar(a b))]
(println a b Hello, World!
Now, *there* are some very suspicious parens around...
1. You're trying to call a as a function
2. Yes, you're calling bar with too few parameters, but how many? One.
3. Finally, after
Hi,
On Friday, July 11, 2014 11:10:53 AM UTC+2, Cecil Westerhof wrote:
2014-07-10 18:34 GMT+02:00 Plínio Balduino pbal...@gmail.com
javascript::
IMO, ! is used when change any global state. A side effect like print on
screen is not enough to cause a ! in the name. I think that's why the
Hi,
On Friday, July 11, 2014 11:33:34 AM UTC+2, Cecil Westerhof wrote:
2014-07-10 19:10 GMT+02:00 Softaddicts lprefo...@softaddicts.ca
javascript::
but as I understood from others it is not about side-effects, but global
state.
as James and I already pointed out, that is not what it
On Thursday, July 10, 2014 5:28:26 PM UTC+2, Cecil Westerhof wrote:
When a function returns a true/false value you should end it with a '?'.
Clojure Programming says that with side effects you should end the
function name with a '!'.
Use the bang! only for things not safe in an STM
pass approach (while I
thought I'd have to create the second grammar with string operations).
* I'll stick to separating parsing and validation for now.
Question answered, case closed, thanks!
Cheers,
stefan
On Wednesday, June 25, 2014 11:31:21 PM UTC+2, Stefan Kamphausen wrote:
Hi,
first
Hi,
first of all, please excuse this cross-post. I tried to get an answer on
the instaparse list first, but it does not seem to reach so many instaparse
users.
Unfortunately I do not know the correct name for the problem I face, hence
the rather vague subject.
I am trying to parse a file
On Thursday, June 19, 2014 11:05:07 PM UTC+2, Thomas Heller wrote:
Excuse my ignorance of not knowing anything about CL and restarts but I
needed something like retry a while back.
Restarts in CL are a different beast. Take a look at e.g.
Hi,
On Wednesday, June 18, 2014 6:13:02 PM UTC+2, Sean Corfield wrote:
I am using Eastwood 0.1.2 without problems with Leiningen 2.4.2 but
perhaps Stefan and others are seeing conflicts because of other stuff in
~/.lein/profiles.clj with Eastwood?
That file is rather small on my machine:
Hi Andy,
On Thursday, June 19, 2014 3:39:41 PM UTC+2, Andy Fingerhut wrote:
Stefan, with the ~/.lein/profiles.clj you pasted:
{:user {:plugins [[jonase/eastwood 0.1.4]
[cider/cider-nrepl 0.7.0-SNAPSHOT]] }}
I do not see the problem. If I change 0.1.4 to 0.1.2 I do.
Hi,
FWIW...
On Wednesday, June 18, 2014 5:06:09 AM UTC+2, Sean Corfield wrote:
works for me...
Does *not* work for me. I see the same error inside and outside of
projects:
$ java -version
java version 1.7.0_11
Java(TM) SE Runtime Environment (build 1.7.0_11-b21)
Java HotSpot(TM) 64-Bit
Oh,
great, yes, that helped. Unexpected.
Thanks,
stefan
On Wednesday, June 18, 2014 11:09:52 AM UTC+2, Ambrose Bonnaire-Sergeant
wrote:
Rather upgrading *from* 0.1.2 fixes.
Thanks,
Ambrose
On Wed, Jun 18, 2014 at 5:08 PM, Ambrose Bonnaire-Sergeant
abonnair...@gmail.com javascript:
Hi,
On Tuesday, June 3, 2014 4:02:45 PM UTC+2, sorin cristea wrote:
Hi all,
I don't know if this question was already asked by someone here but can
you tell me(explain) or guide me to a properly documentation about how is
internal implemented PersistenVector and PersistentHashMap ,
Would German be an option for you?
Just curious
stefan
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RC4 works well for me.
Thanks for all the effort you put into this.
stefan
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On Sunday, March 23, 2014 6:02:26 PM UTC+1, Alex Miller wrote:
Stefan, how do these numbers compare to RC1? Is RC2 better than RC1?
If my tests can be trusted, there is an improvement between RC1 and RC2,
but it is still worse than 1.5.1.
*Version* *Java Version* *User time(s)* *Sys
Hi,
Additionally differences in -XX:+PrintCompilation ouput might be
interesting.
first, I tested with -XX:+PrintInlining and there actually is a difference
for seqFrom: in 1.5.1 there are more occurrences of this function in the
output (see data at the end of this post). Since the
Hi,
On Saturday, March 22, 2014 3:52:00 AM UTC+1, Alex Miller wrote:
That's pretty weird.
that's pretty true.
1.6.0-RC2 is out now - I would really appreciate it if you could give it a
shot.
Sure. Tried with Oracle JDK 7 and 8, each run two times and took the
average. Each run
Hi,
after two days of git bisecting and running my tests over and over again, I
give up. While I can repeatedly identify the commit which causes the
biggest slowdown for me between the 1.5.1 tag and 1.6.0 RC1 I simply refuse
to believe that the result of my analysis is correct.
On
On Saturday, March 22, 2014 12:41:55 AM UTC+1, Andy Fingerhut wrote:
That is odd. This is a shot in the dark, and probably unhelpful because I
do not know a good way to verify whether my guess is true, but perhaps the
seqFrom method went from being small enough to be inlined by your JIT
hi,
RC1 works well with our largest project. See a 5-8% slow-down but no other
problems.
Regards,
Stefan
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Hi Alex,
the runtime of the program changed from 19 to 20 seconds for one set of
data and from approx 6minutes to 6:30 for another set. To me that is
acceptable.
We are reading a few MB of files into memory, create lots of intermediate
vectors, maps and sets and output up to a few hundred
Hi,
On Wednesday, March 19, 2014 3:55:22 PM UTC+1, Michał Marczyk wrote:
Hashes are cached for Clojure collections, keywords and symbols, but
not for strings.
I wonder if people who report these perf regressions use long string
keys in their maps...
As far as I can see, we have /lots/
On Wednesday, March 19, 2014 4:34:45 PM UTC+1, Alex Miller wrote:
Thanks, this is all really useful. I would appreciate any more detailed
info.
* No atoms, agents, refs
* Almost purely functional plus logging and I/O
* Multi-threaded using latest core.async with thread, no go
* JVisualVM
Does wrapping your map expression in a dorun do what you want?
Stefan
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On Friday, January 17, 2014 8:29:21 PM UTC+1, Sam Ritchie wrote:
Okay, here's my post:
http://sritchie.github.io/2014/01/17/api-authentication-with-liberator-and-friend/
Gee, that's way more complicated than I expected. Thanks for sharing
anyway!
stefan
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On Monday, January 13, 2014 3:53:43 AM UTC+1, Sam Ritchie wrote:
cemerick's Friend library is the way to do this:
https://github.com/cemerick/friend
I'm writing up a post on how to combine Friend with Liberator, for easy
ACL management for RESTful APIs. Take a look and let us know what
Hi,
FWIW, I prefer M-C-q with the cursor on the opening paren of a form.
Cheers,
Stefan
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Hi,
I've probably been staring at this for too long to see, what I am doing
wrong.
I have a Ref which contains a vector similar to the following
(def data
[{:a {:b 1 :c 0}}
{:a {:d 1 :g 0}}
{:a {:e 1 :h 0}}
{:a {:f 1 :i 0}}])
There is a second ref, which is similar but without the
OK,
got it. The get-in is stupid and is always returning 0.
Please excuse the noise
stefan
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It looks like you're onto something here
get works with transient maps:
(get (transient {:a 1 :b 2}) :a)
;= 1
and with transient vectors, too:
(get (transient [1 2 3]) 0)
;= 1
but not with transient sets:
(get (transient #{1 2 3}) 2)
;= nil
And using contains? in a reduce with a transient
On Wednesday, November 27, 2013 11:11:27 AM UTC+1, Magnar Sveen wrote:
I think it would be best if the author chimed in,
me too
but it looks like there has been done some good work on optimizing the
development workflow when you're working with languages that need to be
transpiled.
Hi,
logging is a side-effect and I try to keep it out of the functional parts
of my code.
But even for the parts where I want to introduce logging I find that it
renders code less readable.
As an example, say you've got an 'if-let' somewhere
(if-let [a
Hi,
I'd be very interested in learning, how Twixt[1] compares to Optimus and
the other solutions cited.
[1] https://github.com/AvisoNovate/twixt/
Regards,
stefan
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On Tuesday, November 26, 2013 8:56:11 PM UTC+1, Gary Verhaegen wrote:
I haven't had time to really investigate it, but I was planning to delve
into dire for exactly that problem.
https://github.com/MichaelDrogalis/dire
That looks interesting. Thanks for pointing out.
Best,
stefan
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Hi Edward,
you are being hit by laziness here. Clojure's 'for' is not like the 'for'
you may know from other programming languages. It is made for list
comprehensions, that is it is building new list-y things. It does not do
this instantly, the items may be realized only when the caller
I agree with Alex. I would not want any magic to happen
to my string.
Best,
Stefan
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On Saturday, November 23, 2013 3:17:07 PM UTC+1, Justin Smith wrote:
Of course in a real app the key should be serialized to a persistent,
consistent, and shared data store.
Which of course depends on the app in question. The code above was taken
from a 'real app', if 'an app that is used
On Friday, November 22, 2013 12:29:25 AM UTC+1, Jim foo.bar wrote:
apart from the generate-keys fn which is intentionally simplistic and
predictable so I can test somehow, I will admit that these are very good
points indeed.
How about
(defn get-key-generator []
(let [i (atom 0)]
Hi,
I may be missing something here, since this thread leaves me a bit confused.
1. Why are you using a Ref for the bank in the first place? It is a single
identity and thus should be an atom, because you do not need to coordinate
changes of at least two identities.
If I am not mistaken, the
Hi,
On Thursday, November 21, 2013 11:58:31 AM UTC+1, Jim foo.bar wrote:
[...]
1. [...] Since there is a single
identity, perhaps STM is an overkill...
If I read your example correctly, it is not a typical use-case for STM.
2. can you ellaborate why you think this is debatable? All
Hi,
you would only want to use Refs when you need to update at least two of
them with transaction semantics.
When you need to read only one of them, you can just deref them any time
you want, if you need a consistent snapshot of two refs, you need to read
them inside a transaction, i.e.
On Thursday, November 7, 2013 6:32:29 PM UTC+1, Lee wrote:
In Common Lisp when you hit an error you're thrown into a break loop REPL
in which you can view locals, move up and down the stack, and do lots of
other fancier things (re-binding things, restarting...) that are probably
useful
On Friday, November 8, 2013 11:11:14 AM UTC+1, ru wrote:
Hi Jim,
I forget to say that call to count have been done in not a bare repl, but
inside a quite complex program after it did a lot of work on a quite big
data. But, after long and profound analysis of source code I did not found
Hi,
On Friday, October 18, 2013 12:12:31 AM UTC+2, Brian Craft wrote:
I briefly tried working with the reducers library, which generally made
things 2-3 times slower, presumably because I'm using it incorrectly. I
would really like to see more reducers examples, e.g. for this case:
Hi,
What is the idiomatic way of parallelizing a computation on a lazy seq?
keep in mind, that pmap lazily processes the seq with a moving window the
size of which depends on the available cores on your machine. If the
processing of one element takes a long time, the parallel work will wait
http://stackoverflow.com/questions/12412038/in-clojure-are-lazy-seqs-always-chunked
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On Friday, August 16, 2013 9:45:53 AM UTC+2, Antonio Terreno wrote:
I much prefer the #(), (fn[]) is longer so it's a no-go ;)
fn has the huge advantage of taking an (optional) name, which will show up
in stack traces.
Just my 2ct
Stefan
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(let [params (map (fn [_] (gensym fnp-)) (range n))]
(repeatedly n #(gensym fnp-))
Best,
Stefan
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Just for the record:
I've been coding in Lisp for close to 30 years
make that 20 years in my case and I agree with Lee.
Can't live without C-M-q, TAB, M-left/right, C-M-SPC but paredit is
interfering too much for /my/ taste.
stefan
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On Monday, August 5, 2013 2:13:02 PM UTC+2, Mikera wrote:
To me the things that make Clojure namespace handling a nightmare for
beginners are:
- Bad error messages (no.1 problem!)
- Confusion with keywords vs. symbols (why :use in ns declarations vs
use at the repl?)
- Confusion about
Would it still bother you if the IDE helped maintain the ns declaration?
IMHO, having to rely on my editor or an IDE to manage my code would be a
language design smell.
Not that I would mind a little help here and there, though -- e.g.
indentation, completion and a message if there seem
On Tuesday, July 23, 2013 9:42:39 PM UTC+2, Shantanu Kumar wrote:
One of the main issues I have faced with :use is, understanding a
non-trivial codebase becomes very difficult and almost always requires
Emacs Meta-dot.
which is particularly annoying when you read code on a blog (as
On Tuesday, July 23, 2013 11:13:11 PM UTC+2, Ben wrote:
On Tue, Jul 23, 2013 at 1:55 PM, Sean Corfield
seanco...@gmail.comjavascript:
wrote:
On Tue, Jul 23, 2013 at 1:53 PM, Ben Wolfson wol...@gmail.comjavascript:
wrote:
On Tue, Jul 23, 2013 at 1:50 PM, Stefan Kamphausen
ska
Just for the record: I stumbled across the same question just a week ago.
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The Clojure philosophy is that it is rather irritating to think your
recursive call is going to be cleverly optimized into a loop, and then if
you're wrong, you have no good way to know that. So the idea is that you
use the word recur to indicate that *you* think it can be optimized into
Just a little hint which may help you in the future.
First, note the trailing $fn in reformat-headers$fn which tells you, that
your problem is with an anonymous function.
Second, you know that there is a second form for anonymous functions which
uses fn instead of the reader macro.
Third, fn
Hi,
Recently I found myself searching for a white space which got lost
somewhere between reading an XML file and presenting some results from that
via a little webapp.
I think, I could track it down to the following example:
user (clojure.pprint/pprint
(clojure.zip/xml-zip
Thanks for all your suggestions. Seems like a useful addition to
clojure.zip to me.
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Hi,
On Wednesday, June 12, 2013 2:29:42 PM UTC+2, David Pollak wrote:
The license of the JavaScript generated by the ClojureScript compiler is
the license of the source code that was compiled. And that license may be
my company owns it and it's proprietary and we're not licensing it to
Hi,
while working on some XML data extraction I got an NPE which boiled down to
calling some zipper related functions on an empty vector or nil.
I didn't find a function in clojure.zip, clojure.data.zip or
clojure.data.zip.xml to test if an object passed to a function is actually
a zipper.
AFAIK your var myxml already refers to the root node of your XML document.
So your first example searches for a tag called level1 inside the root
tag (which is level1). Obviously, there is no such node and the text is
empty.
Your second example extracts a textual representation of the child
You may want to use the code from https://gist.github.com/Chouser/456326 to
study how the history in refs works. See the accompanying discussion at
http://clojure-log.n01se.net/date/2010-06-28.html. I've been using
variants of that stress test to explain the ref history behavior since then
Besides the obvious org-mode which exports with colors to HTML when you use
#+BEGIN_SRC clojure ... #+END_SRC I also had some fun presenting with
marginalia or impress.js, both using Alex Gorbatchev's Syntax Highlighter.
(FWIW)
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You might want to consider adding it to
https://github.com/bbatsov/clojure-style-guide :-)
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Take a look at the bottom of jason.clj:
https://github.com/clojure/data.json/blob/master/src/main/clojure/clojure/data/json.clj
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It may well be that I'll never get to the US in my whole life, who knows.
Nevertheless, I get to watch fine recordings from interesting talks
developed and given by people way smarter than me. And I get those for
free. What an opportunity..
Patience is something I'm trying to teach my kids
If you have a valid ns-form and still encounter that error, it may help to
compile the file once using C-c C-k. I still need to do that (sometimes?)
when I open a file in Emacs although I'd thought, that the complete project
should have been loaded at REPL start. After that compilation of
Hi,
On Wednesday, March 20, 2013 9:44:19 AM UTC+1, Marko Topolnik wrote:
This problem was cross-posted over here from
StackOverflowhttp://stackoverflow.com/questions/15508152/beginners-emacs-clojure-compiling-error,
where it has already been marked as solved.
oh, sorry, didn't know
On Wednesday, March 20, 2013 10:44:15 AM UTC+1, Marko Topolnik wrote:
Because you usually don't want to wait the eternity it takes to compile
and load absolutely everything. Even loading just the main namespace can be
painfully slow, even if your project is just a few lines, due to the
Hi,
On Monday, March 18, 2013 12:50:13 PM UTC+1, Marko Topolnik wrote:
Dynamic regex building is a standard technique. Unfortunately, once you
leave the regex literal world, you are back to escaping everything.
this works pretty well, at least better than I expected, e.g.:
user= (def r1
On Monday, March 18, 2013 12:25:07 PM UTC+1, Maik Schünemann wrote:
http://dev.clojure.org/display/design/Alternate+string+quote+syntaxes
It would have been nice to still have # available for this and #// for
regexes. That's probably my Perl heritage leaking through, though :)
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You
Thank you all for your valuable input. I'll look into these soon. take-nthis
definitely a function to keep in mind.
Stefan
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Hi,
given a vector of the form
[:key1 1 2 3 :key2 4 :key3 5 6 7]
I wand to create a map collecting the items behind each keyword as a vector
like this:
{:key1 [1 2 3]
:key2 [4]
:key3 [5 6 7]}
I have already written two functions which achieve this, but neither of them
feels good
A simple workaround I've considered, but haven't gotten around to doing
anything about in e.g. Emacs, is to simply tone down the parens visually in
the editor. Hierarchy of color, size, contrast, etc. matters a lot in
perception, and by making the parens slightly less obvious visually
Just a few things, you might find interesting
* anything/helm: http://www.emacswiki.org/Anything
* speedbar (used that in my early years; got rid of it eventually)
* mtorus: http://www.emacswiki.org/emacs/MTorus (shameless self-plug)
* M-. on functions
* M-x ffap
* iswitchb-buffer (just keep the
Hi,
On Saturday, December 22, 2012 5:09:07 PM UTC+1, Stuart Halloway wrote:
Please test it.
my current projects work fine with this RC. Some even seem to be a little
bit faster, but I didn't profile it thoroughly.
Kind regards,
Stefan
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Am Donnerstag, 8. November 2012 19:42:26 UTC+1 schrieb Luc:
I am pragmatic and quite lazy, I use require with an alias
inc
An explicit call to use every now and then on the REPL, but no :use in ns.
IMHO use and :use can be removed from the language.
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Hi,
AFAIK the currently supposed way of parsing XML with Clojure is to use a
combination of clojure.xml, clojure.zip, data.zip and data.zip.xml. Please
correct me if I'm wrong.
I am trying to extract the equivalent of a union of nodesets from an XML
file (speaking in XPath terms).
Example:
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