Clojure will use reflection to find *a* method, but if you want it to pick
the correct one from multiple overloads, you need to give clojure type
hints so it knows the correct static types of the parameters. At least I
think that's how it works.
When I've hit this before, I've just played with
Hi,
Am Montag, 13. Mai 2013 02:25:03 UTC+2 schrieb Korny:
If I call (add-identity agent {:private-key-path foo :passphrase bar})
the clj-ssh library (eventually) calls a java method:
(.addIdentity agent foo bar)
This method has several implementations, including:
public void
For reference:
https://github.com/hugoduncan/clj-ssh/blob/develop/src/clj_ssh/ssh.clj#L145
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Hi,
Am Samstag, 11. Mai 2013 21:25:11 UTC+2 schrieb Alex Baranosky:
Most of the code I see and write at work at Runa uses (not (empty? foo)).
I'll continue to defend the position that it is more obvious code, and
therefore better (imo :) )
seq belongs to seq-land. empty? belongs to data
Yes, by all means please just copy-n-paste out of
https://github.com/runa-dev/kits if it simplifies your dependency tree.
On Sun, May 12, 2013 at 8:53 PM, Dave Kincaid kincaid.d...@gmail.comwrote:
Thanks for this, Stuart. I hope it's not too late. As one who has spent
the last couple weeks
On Mon, May 13, 2013 at 12:55 PM, Mikera mike.r.anderson...@gmail.comwrote:
Maybe we could try to develop towards some kind of lightweight dependency
loading system that avoids this problem?
I believe lightweight dependency loading system is an oxymoron. Either
you A) design a new module
Hi,
Am Montag, 13. Mai 2013 10:35:14 UTC+2 schrieb Stuart Sierra:
I believe lightweight dependency loading system is an oxymoron. Either
you A) design a new module format and try to get everyone to follow it
(OSGI) or B) build an ad-hoc solution that tries to guess at the right
behavior
Are dependencies the potential problem, or are utility belt dependencies
the issue here?
If its the latter, then should we be trying to break down the utility belt
into groups of related functionality, which can be stable and focused.
Promoting zero-dependency libraries just means re-inventing
A good implementation of ISeq won't return a new object, and new
short-lived objects are cheap on the JVM anyway. OTOH count can be slow for
some data structures. if you don't like instantiating lots of new objects
only to throw them away, you're missing out on one of HotSpot's most
2013/5/13 Mike Thvedt cynicalk...@gmail.com
A good implementation of ISeq won't return a new object, and new
short-lived objects are cheap on the JVM anyway. OTOH count can be slow for
some data structures. if you don't like instantiating lots of new objects
only to throw them away, you're
2013/5/13 Meikel Brandmeyer (kotarak) m...@kotka.de
seq belongs to seq-land. empty? belongs to data structure land. It should
actually be implemented as #(zero? (count %)). But unfortunately it is not.
I'd argue it shouldn't
(empty? (cycle [1 2 3])) = false
(zero? (count (cycle [1 2 3])))
I'm extremely happy to announce to the clojure community what I have been
working on for the past couple of months. I'm calling it `adi`, sanskrit
for `beginning`, acronym - (A) (D)atomic (I)nterface.
Get it here: https://github.com/zcaudate/adi
For the more technical minded, these are
Development for money isn't a problem for me, however dev for open source
can be problematic. The scarce resource for open source is mostly time,
though occasionally motivation becomes low. Contributions and projects
start off well, and energy might wane depending on time and life factors.
Even
AtKaaZ atk...@gmail.com writes:
Hi. I've been meaning to ask (all of)you, how do you get moral support? How
do you put yourself into that mood so that you're happy/willing to program?
What motivates you to do it? Is it the people you surround yourself with or
the financial support? Are they
Hey everyone,
You've heard of people live coding Clojure examples as part of their talks.
Heck, you've probably even seen Stuart Halloway jam on Chris Ford's Bach
composition in the new O'Reilly lecture series Clojure Inside Out.
However, that's just warm-up material...
Come and jump aboard
Hi,
Am Montag, 13. Mai 2013 13:57:57 UTC+2 schrieb Herwig Hochleitner:
2013/5/13 Meikel Brandmeyer (kotarak) m...@kotka.de javascript:
seq belongs to seq-land. empty? belongs to data structure land. It should
actually be implemented as #(zero? (count %)). But unfortunately it is not.
That's a fair point, but do you always know that what you've gotten back is
a sequence or a data structure, if you aren't looking directly at the code
that you're calling?
On Monday, May 13, 2013 10:08:00 AM UTC-4, Meikel Brandmeyer (kotarak)
wrote:
Hi,
Am Montag, 13. Mai 2013 13:57:57
On Mon, May 13, 2013 at 7:08 AM, Meikel Brandmeyer (kotarak)
m...@kotka.de wrote:
You misunderstood my argument. cycle returns a sequence = use seq. count is
the wrong thing to call here. And calling seq without using its return value
(with a name) is a smell. count should not be called in
Hi,
Am Montag, 13. Mai 2013 16:16:36 UTC+2 schrieb Mark:
That's a fair point, but do you always know that what you've gotten back
is a sequence or a data structure, if you aren't looking directly at the
code that you're calling?
Most of my code are either sequence-y things (mostly
Everything's in a mercurial repository here:
http://hg.bortreb.com/cortex/
sincerely,
--Robert McIntyre
AtKaaZ atk...@gmail.com writes:
Robert, do you have all that in a project somewhere on github? I really
enjoy all the explanations
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Even so, what do you do when you're using someone else's code as a library?
On Mon, May 13, 2013 at 10:42 AM, Meikel Brandmeyer (kotarak)
m...@kotka.dewrote:
Hi,
Am Montag, 13. Mai 2013 16:16:36 UTC+2 schrieb Mark:
That's a fair point, but do you always know that what you've gotten back
Hi,
Am Montag, 13. Mai 2013 16:16:57 UTC+2 schrieb Sean Corfield:
So you think (count (map inc [1 2 3])) should be illegal?
(I'm just trying to understand your logic here)
In the hardcore version, yes. In the practical version, probably not. I
never had to call count on a seq. (Various
So the following is not encouraged because we disregard the result of
calling seq?
(def dummy
{:a [1 2 3]
:b [4 5 6]
:c []
})
=(every? seq (vals dummy)) ;make sure all values are non-empty
false
Jim
On 13/05/13 15:08, Meikel Brandmeyer (kotarak) wrote:
Hi,
Am Montag, 13. Mai 2013
Hi,
Am Montag, 13. Mai 2013 16:48:13 UTC+2 schrieb Jim foo.bar:
So the following is not encouraged because we disregard the result of
calling seq?
I would prefer (not-any? empty? ...) with empty? being #(zero? (count %))
if all the values are data structures. If there might be sequences
Let's not forget that allocations on the JVM are super, super cheap. In the
order of something like 10 cycles. So don't worry so much about throw-away
objects.
Timothy
On Mon, May 13, 2013 at 8:48 AM, Jim jimpil1...@gmail.com wrote:
So the following is not encouraged because we disregard the
Hi,
Am Montag, 13. Mai 2013 16:56:11 UTC+2 schrieb tbc++:
Let's not forget that allocations on the JVM are super, super cheap. In
the order of something like 10 cycles. So don't worry so much about
throw-away objects.
seq involves realization of the first step of the sequence which can
If there is no one-size fits all solution for your use case, it might
become idiomatic to use a protocol or some other polymorphism. One could
imagine a version of clojure that has protocols for every core function :).
Can you ever have too many cakes to eat them, too?
On Monday, May 13, 2013,
Hi
On Sat, Nov 8, 2008 at 5:10 PM, Robert Pfeiffer
pfeiffer.rob...@googlemail.com wrote:
Is there a benefit in implementing this as a macro instead of a
function? The function version would be very simple:
(defn returning [returnval body]
returnval)
The macro does not allocate a
On Sunday, May 12, 2013 3:34:22 PM UTC-4, atkaaz wrote:
Hi. I've been meaning to ask (all of)you, how do you get moral support?
How do you put yourself into that mood so that you're happy/willing to
program? What motivates you to do it? Is it the people you surround
yourself with or the
I second: using seq to test for emptiness is only one half of the idiom,
the second half is to bind and to destructure (usually with if-let) the
returned value.
Christophe
On Sat, May 11, 2013 at 12:08 PM, Chris Ford christophertf...@gmail.comwrote:
IMHO it's a bit subjective, but empty? is
2013/5/13 Meikel Brandmeyer (kotarak) m...@kotka.de
You misunderstood my argument. cycle returns a sequence = use seq. count
is the wrong thing to call here. And calling seq without using its return
value (with a name) is a smell. count should not be called in sequences.
(In fact I believe
In fact, the way that count works on ISeqs is rather roundabout -- it
only works because all implementations of ISeq in clojure.jar also
happen to implement java.util.List, so count calls Collection.size().
In theory, some user-provided ISeq which didn't implement List would
not respond to count.
In fact, the way that count works on ISeqs is rather roundabout -- it
only works because all implementations of ISeq in clojure.jar also
happen to implement java.util.List, so count calls Collection.size().
In theory, some user-provided ISeq which didn't implement List would
not respond to count.
On Mon, May 13, 2013 at 1:42 AM, Meikel Brandmeyer (kotarak)
m...@kotka.de wrote:
Hi,
Am Montag, 13. Mai 2013 10:35:14 UTC+2 schrieb Stuart Sierra:
I believe lightweight dependency loading system is an oxymoron. Either
you A) design a new module format and try to get everyone to follow it
Nelson Morris writes:
What helps is direct involvement by someone else.
I'll definitely echo this. People are more important than programs.
If I'm writing code that I'm going to be the only one using, maybe it'll
hold my interest for a few hours. But even in the best cases it's
usually only
Jonathon McKitrick writes:
Has anyone had any success accepting FTP uploads in Clojure on Heroku?
Unfortunately Heroku apps are only capable of responding to HTTP
requests at this point.
-Phil
pgp4tO21faepT.pgp
Description: PGP signature
Angel Java Lopez writes:
I guess it could be difficult to implement such feature in Java/Clojure
It's really not difficult to do if you limit yourself to Clojure since
Clojure namespaces are first-class and easy to manipulate at
run-time. We implemneted a prototype of this in under two hours
Code that matters is code that's used by other people. For me personally
the ability to share my code with others is the thing that makes
programming worth doing in the first place.
This is a rather important point. One of the most asked questions
(random made up fact) by newcomers to a
I doubt I'm unique in this area, but for me, programming is a drug. I have
to code, or the ideas and thoughts build up in my mind. For me, actually
writing down and implementing these is a stress relief. Just ask my parents
when I was growing up, or my wife today. Keep me in a room without a
Latest alpha build of the upcoming 0.3.0 release of Clojure's JDBC
wrapper contrib library.
TL;DR: Extensive code changes around connection handling that I'd like
to see get tested in the real world...
http://corfield.org/blog/post.cfm/clojure-java-jdbc-0-3-0-alpha-4
--
Sean A Corfield -- (904)
Let me share this tale with you guys, hope you like it as much as I do:
It is said that Socrates met a worker who asked: what are you doing good man
? Don't you see I'm cutting a stone to earn my salary and so I can eat the
worker replied. He moved on and later found another worker questioning
What tools exist in Clojure for understanding whether a given variable is
boxed or primitive?
To get a better handle on boxing, I started playing around with things like:
(def x 1)
(def ^int x 1)
(def x (int 1))
I want to know how Clojure is storing that 1 in the various cases.
The only tool I
I'm guilty of this... But I really don't know what to do I still find
myself thinking... Hmmm this library provides about 50% of what I want... This
library has 2 functions that I like And I don't like the way something is
implemented here... If only i can combine this, this, and
On Mon May 13 13:36:53 2013, Mark Engelberg wrote:
What tools exist in Clojure for understanding whether a given variable
is boxed or primitive?
To get a better handle on boxing, I started playing around with things
like:
(def x 1)
(def ^int x 1)
(def x (int 1))
I want to know how Clojure is
On Tue, May 14, 2013 at 3:25 AM, Phil Hagelberg p...@hagelb.org wrote:
It's really not difficult to do if you limit yourself to Clojure since
Clojure namespaces are first-class and easy to manipulate at
run-time. We implemneted a prototype of this in under two hours at a
Seajure meeting a
On Tuesday, May 14, 2013 5:36:53 AM UTC+10, puzzler wrote:
What tools exist in Clojure for understanding whether a
given variable is boxed or primitive?
The REPL will always box things, making it difficult to use
for understanding primitives.
If you want to be 100% sure, AOT-compile your code
Stuart Sierra writes:
That's cool, and it will work for the simple case of libraries A and B
depending on different versions of C.
But it still breaks down in more complex cases: e.g. if I want to share
data between A and B using a protocol or type defined in C, and there are 2
incompatible
One of the reasons I program is because I'm furious.
By most accepted metrics, I went to one of the best technical public high
schools in the country. I was average there and I was taking graph theory
and multivariable calculus as a senior my last semester. The smart kids
though? They were
On 13 May 2013 17:30, Timothy Baldridge tbaldri...@gmail.com wrote:
In fact, the way that count works on ISeqs is rather roundabout -- it
only works because all implementations of ISeq in clojure.jar also
happen to implement java.util.List, so count calls Collection.size().
In theory, some
Or a reason to integrate via data, not api or type.
On Monday, May 13, 2013 10:54:26 PM UTC+2, Phil Hagelberg wrote:
Stuart Sierra writes:
That's cool, and it will work for the simple case of libraries A and B
depending on different versions of C.
But it still breaks down in more
Is it normal to take this long to start the repl?
I don't know if it is normal. But I can confirm it takes much longer to
start ritz-nrepl compared to nrepl only, which itself is already kind of
slow. The slow speed really is killing a lot of fun here.
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Tested this one in the real world using an Oracle database: Address
JDBC-51 by declaring get-connection returns java.sql.Connection
indeed it does return a java.sql.Connection
What are your plans for documentation beyond the doc strings? I've been
trying to keep track of how I'm using the
On Mon, May 13, 2013 at 3:01 PM, Gary Deer gdee...@gmail.com wrote:
What are your plans for documentation beyond the doc strings?
There are some additional documentation pages, based on the doc folder
in the Github repo here:
https://github.com/clojure/java.jdbc/tree/master/doc/clojure/java/jdbc
I heard using a sdd can reduce the time a lot. Maybe 5x?
Can someone confirm on that?
On Monday, May 13, 2013 6:17:38 PM UTC-4, Warren Lynn wrote:
Is it normal to take this long to start the repl?
I don't know if it is normal. But I can confirm it takes much longer to
start
+1 :)
I doubt I'm unique in this area, but for me, programming is a drug. I have
to code, or the ideas and thoughts build up in my mind. For me, actually
writing down and implementing these is a stress relief. Just ask my parents
when I was growing up, or my wife today. Keep me in a room
2013/5/14 Sean Corfield seancorfi...@gmail.com
I think in-depth documentation for using java.jdbc probably belongs
somewhere like http://clojure-doc.org - (but I'm not quite sure where
it belongs on that site)
Next to core.typed documentation (which needs some editing to follow the
rest of
2013/5/14 Sean Corfield seancorfi...@gmail.com
http://clojure-doc.org is easy to contribute to so with a bit of
guidance from that team, perhaps we can start a section there for
java.jdbc documentation? And maybe move the four pieces of
documentation above from the contrib repo to the
Hello everyone.
In the aftermath of the recent Linode intrusion[1][2], we determined
that Clojars' policy of allowing artifacts to be overwritten[3] makes it
much more difficult to detect an attack than it would be if artifacts
were immutable like they are in most other repositories.
While
Phil Hagelberg writes:
In the aftermath of the recent Linode intrusion[1][2], we determined
that Clojars' policy of allowing artifacts to be overwritten[3] makes it
much more difficult to detect an attack than it would be if artifacts
were immutable like they are in most other repositories.
Is the policy for SNAPSHOT artifacts still that you can overwrite as much
and as often as you want?
-Zack
On Tuesday, May 14, 2013 3:30:19 AM UTC+4, Phil Hagelberg wrote:
Phil Hagelberg writes:
In the aftermath of the recent Linode intrusion[1][2], we determined
that Clojars' policy of
2013/5/12 AtKaaZ atk...@gmail.com
How do you put yourself into that mood so that you're happy/willing to
program? What motivates you to do it?
When it comes to work projects, I am personally motivated by building
something useful and
making a good living out of it. The process of programming
Why shouldn't that be the case? A seq is a collection of data. And it's
immutable, why would it bein its own category of collections?
Timothy
On May 13, 2013 3:45 PM, Philip Potter philip.g.pot...@gmail.com wrote:
On 13 May 2013 17:30, Timothy Baldridge tbaldri...@gmail.com wrote:
In fact,
Neither of these snarky answers solve the problem. I just spent an entire
week updating modules from version of a library that expected a seq of maps
to one that expected map of seqs of maps. The very nature of data implies
a format. If that format changes you have a compatibility issue no fancy
Zack Maril writes:
Is the policy for SNAPSHOT artifacts still that you can overwrite as much
and as often as you want?
Technically no, but effectively yes. Any version ending in -SNAPSHOT
is automatically translated into a timestamped version upon deploy or
resolution. So 0.5.0-SNAPSHOT
Zack, you've probably come across this profile on Jeff Hammerbacher, but
just in case.
The best minds of my generation are thinking about how to make people
click ads, he says. That sucks.
http://www.businessweek.com/printer/articles/55578-this-tech-bubble-is-different
On Monday, May 13, 2013
In regards to the allocation objection--how often are you calling seq
millions of times on something that's not already a seq? In re using count
instead of seq, a lazy seq's count might be arbitrarily expensive to
calculate and might not be able to tell if it's empty without realizing its
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