Re: Quirk with printing regexps
On Sun, Mar 31, 2013 at 10:46 PM, Andy Fingerhut wrote: > If you print it as a string, then want to read it back in and convert back > to a regex, you must read it as a string, then call re-pattern on it. That > should preserve the original meaning. > > Printing it as a string, and trying to read it as a regex by prepending it > directly with # before the " of the string, would definitely change the > meaning of the regex in the case you mention, and many many others. > > Andy > > Yeah, my goal is simply to get (re-pattern #"a\nb") to print (or more precisely, pr) as #"a\nb" without affecting the semantics of printing other regular expressions, but that seems to be impossible to achieve. Sigh... -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Quirk with printing regexps
If you print it as a string, then want to read it back in and convert back to a regex, you must read it as a string, then call re-pattern on it. That should preserve the original meaning. Printing it as a string, and trying to read it as a regex by prepending it directly with # before the " of the string, would definitely change the meaning of the regex in the case you mention, and many many others. Andy On Sun, Mar 31, 2013 at 10:33 PM, Mark Engelberg wrote: > On Sat, Mar 30, 2013 at 11:33 AM, Mark Engelberg > wrote: > >> On Thu, Mar 28, 2013 at 6:36 PM, Andy Fingerhut > > wrote: >> >>> (defn print-regex-my-way [re] >>> (print "#regex ") >>> (pr (str re))) >>> >>> That might be closer to what you want. >>> >> >> Yes. That does the trick. That extra level of converting the regular >> expression to a string does the trick because pr "does the right thing" >> with strings, but not with regexes. I'd classify pr's different behavior >> on regexes as a bug, but this is an effective workaround. >> > > I found a deficiency with the trick of converting the regex to a string > for printing. > > Consider: > (print-regex-my-way #"\s") > which will print as > #regex "\\s" > > The extra \ changes the meaning of the regular expression. > > > > > > -- > -- > 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 unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > > -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: Quirk with printing regexps
On Sat, Mar 30, 2013 at 11:33 AM, Mark Engelberg wrote: > On Thu, Mar 28, 2013 at 6:36 PM, Andy Fingerhut > wrote: > >> (defn print-regex-my-way [re] >> (print "#regex ") >> (pr (str re))) >> >> That might be closer to what you want. >> > > Yes. That does the trick. That extra level of converting the regular > expression to a string does the trick because pr "does the right thing" > with strings, but not with regexes. I'd classify pr's different behavior > on regexes as a bug, but this is an effective workaround. > I found a deficiency with the trick of converting the regex to a string for printing. Consider: (print-regex-my-way #"\s") which will print as #regex "\\s" The extra \ changes the meaning of the regular expression. -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: hash-map initialization issue
Thanks for your input guys
Ryan
On Sunday, March 31, 2013 11:11:08 AM UTC+3, Alex Baranosky wrote:
>
> There's also 'for'
>
> (defn my-function [foo-id a-keyword a-list]
> (for [m a-list]
> {:foo_id foo-id (keyword a-keyword) (:BAR_KEY m)}))
>
>
> On Sun, Mar 31, 2013 at 12:57 AM, JvJ >wrote:
>
>> ...even cheezier, use do
>> #(do {:foo %})
>>
>>
>> On Saturday, 30 March 2013 23:58:31 UTC-4, JvJ wrote:
>>>
>>> Here's a cheezy hack, use identity.
>>>
>>> #(identity {:foo %})
>>>
>>> On Thursday, 28 March 2013 17:51:10 UTC-4, Ryan wrote:
Thanks for your explanation Jonathan. I am still a bit confused however
what is the proper solution here. Should i use an anonymous function
instead to do what I want or can it be done with the #() syntax?
Hyphens is my preferred way as well, but, those keys represent sql
columns which they use underscore so I gotta go with underscores in order
code to match them :)
Ryan
On Thursday, March 28, 2013 11:24:38 PM UTC+2, Jonathan Fischer Friberg
wrote:
>
> It's because the #() syntax always calls the content as a function.
>
> So #(...) is the same as (fn [] (...)). In your case,
> #({:foo_id foo-id (keyword a-keyword) (:BAR_KEY %)})
> is the same as:
> (fn [%] ({:foo_id foo-id (keyword a-keyword) (:BAR_KEY %)}))
> Note the extra () around {}. In other words, your map is called
> as a function.
>
> Maps can normally be called as functions, like this:
> ({:hello :world} :hello)
> => :world
> That's why you get the "Wrong number of args" error
> (and not a "a map is not a function" error).
> Hope that makes sense.
>
> Btw, hyphen is normally used instead of underscore
> in both variables and keywords. Just a slight style
> "issue", but maybe you had your reasons. :)
>
> Jonathan
>
>
> On Thu, Mar 28, 2013 at 10:16 PM, Ryan wrote:
>
>> Hello!
>>
>> I am having a small issue with a hash-map initialization and I am
>> failing to understand why. I have the following situation:
>>
>> (def a-list '({:BAR_KEY bar-value}, {:BAR_KEY another-value}))
>>
>>
>> (defn my-function [foo-id a-keyword a-list]
>>
>> (map #({:foo_id foo-id (keyword a-keyword) (:BAR_KEY %)}) a-list))
>>>
>>
>> So, by running the above function like this:
>>
>> (my-function 5 "my_keyword" a-list)
>>
>>
>> I get the following error:
>>
>> *clojure.lang.ArityException: Wrong number of args (0) passed to:
>>> PersistentArrayMap*
>>
>>
>> I am trying to get the following result:
>>
>> ({:foo_id 5 :my_keyword bar-value}, {:foo_id 5 :my_keyword
>> another-value})
>>
>> Any ideas? I have played around in repl for the last 2 hrs but I
>> haven't found the proper way to do this.
>>
>> Thank you for your time :)
>>
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[ANN] clj-time 0.5.0 and repo/org change
clj-time 0.5.0 was recently released which includes the following changes: * update Joda Time to 2.2 * update default version of Clojure to 1.5.1 (still supporting 1.2.1 onward) * add: last-day-of-the-month, first-day-of-the-month, number-of-days-in-the-month, today-at and periodic-seq from Michael Klishin's Quartzite library * add: do-at from Alex Baranosky's utilize library * add support for LocalDate In addition, clj-time has moved to its own organization: https://github.com/clj-time/clj-time My fork still exists to maintain any existing links but all new issues and pull requests should be made against the new org/repo now. Huge thanks to Michael Klishin for his assistance lately with clj-time. We're hoping to have much expanded documentation for clj-time soon and perhaps a dedicated website for this library! Please also note that there is a dedicated mailing list for users of clj-time on Google Groups: http://groups.google.com/group/clj-time -- Sean A Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ World Singles, LLC. -- http://worldsingles.com/ "Perfection is the enemy of the good." -- Gustave Flaubert, French realist novelist (1821-1880) -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: ANN: no.disassemble, a runtime bytecode disassembler
Ritz's debugger approach looks much more thorough and doesn't require invasive extra dependencies as far as I can tell. If I had known it existed, I probably wouldn't have bothered :-). One major weakness of my approach is it doesn't take into account class-unloading through garbage collection of clojure's ethereal classloaders. One way around that would be apply transformations to clojure's dynamic classloaders, and add finalizers to do cleanup, but it seems more trouble than it's worth. The jpda approach looks like what I really want. Still, it's not clear how to use it. I see a test in https://github.com/pallet/ritz/blob/develop/debugger/test/ritz/jpda/disassemble_test.clj#L90 but it appears to be more fine-grained than just grabbing the class of an object and dumping the bytecode. Before I go down the rabbit-hole, is there anything like that in ritz's code? On Saturday, March 30, 2013 2:31:36 PM UTC-4, Hugo Duncan wrote: > > Gary Trakhman > writes: > > > I made a little proof of concept last night. You could always look at > > bytecode that clojure emits in few ways, you can either hack the > compiler > > yourself, or force AOT in your project and use javap. The first > approach > > is a bit intrusive, and the second has a somewhat annoying turnaround > time, > > and won't work for any code that calls eval at runtime. > > > > This takes another approach. It uses java's Instrumentation stuff, to > > provide a hook into all classloading past the point at which it's > loaded, > > where I store off all the bytes of defined classes into a big > > ConcurrentHashMap. Then I use eclipse.jdt.core's disassembler > > functionality to print out the bytecode. > > The Ritz' disassembler uses jpda to access the bytecode. Not yet ported > to > ritz-nrepl though. > > Hugo > -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: ANN: Windows installer for Leiningen
> That's correct, now it works! :)
>
Great. The patch has been accepted by leiningen, so it should be in the
next release.
> IMHO the patch should be just the line 83 of your file, the other
> quoted variables are URLs (which cannot have spaces). Note that
> :DownloadFile, when calls powershell, inverts the order of its
> arguments.
>
The extra quotes seem to be an artifact of passing the arguments on the
command-line. The actual arguments to the DownloadFile method in .NET
aren't expected to contain quotes.
>From inside powershell itself, this works:
(new-object System.Net.WebClient).DownloadFile("
https://raw.github.com/technomancy/leiningen/stable/bin/lein.bat";, "with
space\file name.txt")
So the extra quotes probably won't harm on either parameter.
--
Dave
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Re: ANN: Windows installer for Leiningen
On Sun, Mar 31, 2013 at 5:23 PM, David Powell wrote: > I think that this patch fixes the issue: > https://github.com/djpowell/leiningen/commit/bd9e2e25508cfc01889057349b133941ff4fc379 > > It seems that quotes around powershell parameters on the command-line need > to be triple-double-quoted :) That's correct, now it works! :) IMHO the patch should be just the line 83 of your file, the other quoted variables are URLs (which cannot have spaces). Note that :DownloadFile, when calls powershell, inverts the order of its arguments. Thanks again, Roberto > -- > Dave > > -- > -- > 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 unsubscribe from this group and stop receiving emails from it, send an > email to clojure+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/groups/opt_out. > > -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: ANN: Windows installer for Leiningen
Hi, But there is a second problem. It (apparently) tries two save the jar file > in > C:\Users\\.lein\self-installs\leiningen-x.y.z-standalone.jar > > But it looks like it doesn't deal correctly with spaces in the path. If > your Username > were to be "John Doe", only the part in front of the space is used as the > install path. > > So the leiningen jar-file would actually be a file named "John" in the > directory C:\Users, > instead of C:\Users\John > Doe\.lein\self-installs\leiningen-x.y.z-standalone.jar. > I think all of these problems, and Robertos issue are caused by the same lein.bat. The permissions problem is probably because the spaces in the profile are causing lein to attempt to write outside of the user profile. I think that this patch fixes the issue: https://github.com/djpowell/leiningen/commit/bd9e2e25508cfc01889057349b133941ff4fc379 It seems that quotes around powershell parameters on the command-line need to be triple-double-quoted :) -- Dave -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: ANN: Windows installer for Leiningen
Using lein.bat with powershell I found two issues:
First, there is the aforementioned
{param($a,$f) (new-object System.Net.WebClient).DownloadFile ($a,
$f)}
DotNetMethodException.
This could be solved by starting the Command Prompt as an Administrator
(shift + right-click on the cmd.exe, then "Run as administrator").
Then it's able to download the leiningen jar-file.
But there is a second problem. It (apparently) tries two save the jar file
in
C:\Users\\.lein\self-installs\leiningen-x.y.z-standalone.jar
But it looks like it doesn't deal correctly with spaces in the path. If
your Username
were to be "John Doe", only the part in front of the space is used as the
install path.
So the leiningen jar-file would actually be a file named "John" in the
directory C:\Users,
instead of C:\Users\John
Doe\.lein\self-installs\leiningen-x.y.z-standalone.jar.
I hope this helps :-)
Am Sonntag, 31. März 2013 16:08:46 UTC+2 schrieb David Powell:
>
>
> powershell -Command "& {param($a,$f)
>> (new-object System.Net.WebClient).DownloadFile($a, $f)}" %~2 %~1
>>
>
> Ah, yeah. %~1 and %~2 strip the quotes off the parameters, which isn't a
> good idea.
> Something like this should work:
>
>
>> powershell -Command "& {param($a,$f)
>> (new-object System.Net.WebClient).DownloadFile($a, $f)}" "%~2" "%~1"
>>
>
>
>> [I can't believe both that in 2013 MS Windows does not handle such
>> cases, and that Windows Administrators still create User profiles with
>> spaces inside]
>>
>
> To be fair, whilst batch file syntax is horrible, it is more a lein.bat
> problem in this case. If we pass two parameters without quotes, and one
> has spaces in, it isn't surprising that it gets interpreted wrongly.
>
> I'll submit a patch to fix the handling of profiles with spaces in them in
> lein.bat
>
>
> --
> Dave
>
>
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Re: ANN: Windows installer for Leiningen
> powershell -Command "& {param($a,$f)
> (new-object System.Net.WebClient).DownloadFile($a, $f)}" %~2 %~1
>
Ah, yeah. %~1 and %~2 strip the quotes off the parameters, which isn't a
good idea.
Something like this should work:
> powershell -Command "& {param($a,$f)
> (new-object System.Net.WebClient).DownloadFile($a, $f)}" "%~2" "%~1"
>
> [I can't believe both that in 2013 MS Windows does not handle such
> cases, and that Windows Administrators still create User profiles with
> spaces inside]
>
To be fair, whilst batch file syntax is horrible, it is more a lein.bat
problem in this case. If we pass two parameters without quotes, and one
has spaces in, it isn't surprising that it gets interpreted wrongly.
I'll submit a patch to fix the handling of profiles with spaces in them in
lein.bat
--
Dave
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Re: ANN: Windows installer for Leiningen
C:\Users\Roberto Mannai\.lein\bin>powershell -Command echo $host.version
Major Minor Build Revision
- - -
2 0 -1 -1
I'm doing some test, the problem seems to be this line:
powershell -Command "& {param($a,$f) (new-object
System.Net.WebClient).DownloadFile($a, $f)}" %~2 %~1
Where %~1 points to a path with a space inside:
C:\Users\Roberto
Mannai\.lein\self-installs\leiningen-2.1.2-standalone.jar.pending
[I can't believe both that in 2013 MS Windows does not handle such
cases, and that Windows Administrators still create User profiles with
spaces inside]
It should be enough to do a smarter string concation; I'll try later.
Thanks again,
Roberto
On Sun, Mar 31, 2013 at 3:45 PM, David Powell wrote:
> Also, can you check what version of powershell you have?
>
> powershell -Command echo $host.version
>
> --
> Dave
>
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Re: ANN: Windows installer for Leiningen
Also, can you check what version of powershell you have? powershell -Command echo $host.version -- Dave -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
Re: ANN: Windows installer for Leiningen
Interesting. Yes this is a problem with lein.bat rather than the installer. Leiningen recently added support for powershell because it was assumed that powershell would always be installed, but in fact that isn't the case. The installer bundles curl as a fallback for when powershell isn't installed. The error suggests that you have powershell installed, but that it isn't working for some reason. Could you tell me what version of windows you are using? Do you have any unusual network setup - eg, are you behind a proxy? Did the installer successfully download lein.bat to ~/.lein/bin/lein.bat? Can you see if this command completes without errors: curl " https://leiningen.s3.amazonaws.com/downloads/leiningen-2.1.2-standalone.jar"; -o test.jar If powershell is going to be a problem, then it might be easier for leiningen to lower powershell below curl in the priority list. -- Dave -- -- 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 unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
What's the difference between a "sequence" and a "seq"?
On http://clojure.org/lazier,
Changed: (rest aseq) - returns a logical collection (Sequence) of
the remaining items, not (necessarily) a seq
rest simply calls RT.more and here's the code of RT.more:
static public ISeq more(Object x){
if(x instanceof ISeq)
return ((ISeq) x).more();
ISeq seq = seq(x);
if(seq == null)
return PersistentList.EMPTY;
return seq.more();
}
So, it seems to return just a seq and not some logical collection?
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Re: ANN: Windows installer for Leiningen
Hello,
Should one have Powershell pre-installed? The wizard does not complete
successfully the "self-install" step, although it seems as it is not
aware of it.
When running "lein self-install" manually, I get a
DotNetMethodException (*). Now I'd guess this is an issue of lein.bat,
not of your installer, anyway it would be nice if your package could
embed all the hidden dependencies, as it already does for "curl.exe".
Kind regards,
Roberto
(*)
C:\Users\Roberto Mannai\.lein\bin>lein self-install
Downloading Leiningen now...
Eccezione durante la chiamata di "DownloadFile" con "2" argomento/i:
"Eccezione durante una richiesta WebClient."
In riga:1 car:63
+ & {param($a,$f) (new-object System.Net.WebClient).DownloadFile ($a, $f)}
https://leiningen.s3.amazonaws.com/downloads/leiningen-2.1.2-standalone.jar C:
\Users\Roberto Mannai\.lein\self-installs\leiningen-2.1.2-standalone.jar.pendin
g
+ CategoryInfo : NotSpecified: (:) [], MethodInvocationException
+ FullyQualifiedErrorId : DotNetMethodException
On Sat, Mar 30, 2013 at 6:39 PM, David Powell wrote:
> Hi,
>
> I've put together an installer for Leiningen on Windows:
> http://leiningen-win-installer.djpowell.net/
>
> Hopefully it should make it a bit easier for Windows people to get Leiningen
> and a Clojure repl up and running.
>
> It requires a JDK to be installed first, but other than that there aren't
> any dependencies.
> It should work on Windows XP and above, 32-bit or 64-bit. With or without
> powershell available.
>
> The installer should take the hassle out of setting up paths and environment
> variables, and changing them when new JDKs are installed.
>
> The current version is beta1. If you've got any feedback then give me an
> email.
>
> --
> Dave
>
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Re: Persistent Data Structures for Objective-C/LLVM
I implemented persistent, array-mapped Patricia trees in C a while ago:
https://matthias.benkard.de/journal/118
It should be relatively straight-forward to build some Objective-C classes
on top of that. (There's a reason the memory management routines are named
bpt_{retain, release, dealloc}. :))
You'll just need to do the hashing yourself if you want to build a hash map.
Matthias
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Re: Invoke a specific multimethod
Just copy/paste from my Counterclockwise REPL. :-)
- Chas
On Mar 30, 2013, at 11:54 PM, JvJ wrote:
> Also, nice syntax highlighting! How'd you do that?
>
> On Saturday, 30 March 2013 23:54:03 UTC-4, JvJ wrote:
> get-method. Thanks, that was exactly what I was looking for!
>
> On Saturday, 30 March 2013 07:20:54 UTC-4, Chas Emerick wrote:
> On Mar 30, 2013, at 12:00 AM, George Oliver wrote:
>
>>
>>
>> On Friday, March 29, 2013 6:19:19 PM UTC-7, JvJ wrote:
>> Is it possible to invoke a particular multimethod and bypass the dispatch
>> function?
>>
>> For instance, suppose that I have a multimethod with a dispatch value of
>> ::foo, and it's a really complex method.
>>
>> Now, I want all cases where the dispatch function returns nil to use the
>> same multimethod. Is there a way I can intercept the nil and
>> pass it directly on to the ::foo multimethod?
>>
>> You could use the default multimethod to catch nil, and then call the multi
>> with ::foo.
>
> That will only work if the dispatch fn is identity or similar.
>
> If you control the dispatch fn, then you don't need to "intercept nil" --
> just returning ::foo from the dispatch fn when it might otherwise return nil
> will get you to the method you want.
>
> If you *don't* control the dispatch fn, but you're providing the methods for
> :foo and nil, then you can use `get-method` to obtain the method associated
> with a particular dispatch value:
>
> => (defmulti foo :bar)
> #'user/foo
> => (defmethod foo :baz
> [x]
> (str x))
> #
> => (defmethod foo :default
> [x]
> ((get-method foo :baz) x))
> #
> => (foo {:bar :baz})
> "{:bar :baz}"
> => (foo {:some :other :value :here})
> "{:some :other, :value :here}"
>
> Of course, if the functionality you need is available as a separate top-level
> fn, and you can avoid the extra effective dispatch through the multimethod,
> all the better.
>
> Cheers,
>
> - Chas
>
>
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Re: hash-map initialization issue
There's also 'for'
(defn my-function [foo-id a-keyword a-list]
(for [m a-list]
{:foo_id foo-id (keyword a-keyword) (:BAR_KEY m)}))
On Sun, Mar 31, 2013 at 12:57 AM, JvJ wrote:
> ...even cheezier, use do
> #(do {:foo %})
>
>
> On Saturday, 30 March 2013 23:58:31 UTC-4, JvJ wrote:
>>
>> Here's a cheezy hack, use identity.
>>
>> #(identity {:foo %})
>>
>> On Thursday, 28 March 2013 17:51:10 UTC-4, Ryan wrote:
>>>
>>> Thanks for your explanation Jonathan. I am still a bit confused however
>>> what is the proper solution here. Should i use an anonymous function
>>> instead to do what I want or can it be done with the #() syntax?
>>>
>>> Hyphens is my preferred way as well, but, those keys represent sql
>>> columns which they use underscore so I gotta go with underscores in order
>>> code to match them :)
>>>
>>> Ryan
>>>
>>> On Thursday, March 28, 2013 11:24:38 PM UTC+2, Jonathan Fischer Friberg
>>> wrote:
It's because the #() syntax always calls the content as a function.
So #(...) is the same as (fn [] (...)). In your case,
#({:foo_id foo-id (keyword a-keyword) (:BAR_KEY %)})
is the same as:
(fn [%] ({:foo_id foo-id (keyword a-keyword) (:BAR_KEY %)}))
Note the extra () around {}. In other words, your map is called
as a function.
Maps can normally be called as functions, like this:
({:hello :world} :hello)
=> :world
That's why you get the "Wrong number of args" error
(and not a "a map is not a function" error).
Hope that makes sense.
Btw, hyphen is normally used instead of underscore
in both variables and keywords. Just a slight style
"issue", but maybe you had your reasons. :)
Jonathan
On Thu, Mar 28, 2013 at 10:16 PM, Ryan wrote:
> Hello!
>
> I am having a small issue with a hash-map initialization and I am
> failing to understand why. I have the following situation:
>
> (def a-list '({:BAR_KEY bar-value}, {:BAR_KEY another-value}))
>
>
> (defn my-function [foo-id a-keyword a-list]
>
> (map #({:foo_id foo-id (keyword a-keyword) (:BAR_KEY %)}) a-list))
>>
>
> So, by running the above function like this:
>
> (my-function 5 "my_keyword" a-list)
>
>
> I get the following error:
>
> *clojure.lang.ArityException: Wrong number of args (0) passed to:
>> PersistentArrayMap*
>
>
> I am trying to get the following result:
>
> ({:foo_id 5 :my_keyword bar-value}, {:foo_id 5 :my_keyword
> another-value})
>
> Any ideas? I have played around in repl for the last 2 hrs but I
> haven't found the proper way to do this.
>
> Thank you for your time :)
>
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Re: hash-map initialization issue
...even cheezier, use do
#(do {:foo %})
On Saturday, 30 March 2013 23:58:31 UTC-4, JvJ wrote:
>
> Here's a cheezy hack, use identity.
>
> #(identity {:foo %})
>
> On Thursday, 28 March 2013 17:51:10 UTC-4, Ryan wrote:
>>
>> Thanks for your explanation Jonathan. I am still a bit confused however
>> what is the proper solution here. Should i use an anonymous function
>> instead to do what I want or can it be done with the #() syntax?
>>
>> Hyphens is my preferred way as well, but, those keys represent sql
>> columns which they use underscore so I gotta go with underscores in order
>> code to match them :)
>>
>> Ryan
>>
>> On Thursday, March 28, 2013 11:24:38 PM UTC+2, Jonathan Fischer Friberg
>> wrote:
>>>
>>> It's because the #() syntax always calls the content as a function.
>>>
>>> So #(...) is the same as (fn [] (...)). In your case,
>>> #({:foo_id foo-id (keyword a-keyword) (:BAR_KEY %)})
>>> is the same as:
>>> (fn [%] ({:foo_id foo-id (keyword a-keyword) (:BAR_KEY %)}))
>>> Note the extra () around {}. In other words, your map is called
>>> as a function.
>>>
>>> Maps can normally be called as functions, like this:
>>> ({:hello :world} :hello)
>>> => :world
>>> That's why you get the "Wrong number of args" error
>>> (and not a "a map is not a function" error).
>>> Hope that makes sense.
>>>
>>> Btw, hyphen is normally used instead of underscore
>>> in both variables and keywords. Just a slight style
>>> "issue", but maybe you had your reasons. :)
>>>
>>> Jonathan
>>>
>>>
>>> On Thu, Mar 28, 2013 at 10:16 PM, Ryan wrote:
>>>
Hello!
I am having a small issue with a hash-map initialization and I am
failing to understand why. I have the following situation:
(def a-list '({:BAR_KEY bar-value}, {:BAR_KEY another-value}))
(defn my-function [foo-id a-keyword a-list]
(map #({:foo_id foo-id (keyword a-keyword) (:BAR_KEY %)}) a-list))
>
So, by running the above function like this:
(my-function 5 "my_keyword" a-list)
I get the following error:
*clojure.lang.ArityException: Wrong number of args (0) passed to:
> PersistentArrayMap*
I am trying to get the following result:
({:foo_id 5 :my_keyword bar-value}, {:foo_id 5 :my_keyword
another-value})
Any ideas? I have played around in repl for the last 2 hrs but I
haven't found the proper way to do this.
Thank you for your time :)
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>>>
>>>
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