Is there any practical difference between:
(let [x 2]
(defn f [] x))
and
(def f (let [x 2] (fn [] x)))?
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"In this interview taped at QCon London 2009 Rich Hickey talks about
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42 minute video:
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Hopefully this doesn't get me booed off the message board but is there
a Clojure equivalent to Ruby's ERB? I'm try to use Clojure to perform
code generation and, while it makes for an excellent language to write
a parser in, I can't quite figure out the best way to actually
template out the code.
Hi everyone,
I have just started learning Clojure, and I found Clojure Box (http://
clojure.bighugh.com/) to be an easy installation for that.
Unfortunately, I am not sure about the right way to exit from the
prompt.
After starting Clojure Box and using the prompt (possibly including
loading and
> I have just started learning Clojure, and I found Clojure Box (http://
> clojure.bighugh.com/) to be an easy installation for that.
> Unfortunately, I am not sure about the right way to exit from the
> prompt.
> After starting Clojure Box and using the prompt (possibly including
> loading and sa
On May 27, 4:12 am, Mark Engelberg wrote:
> Is there any practical difference between:
>
> (let [x 2]
> (defn f [] x))
>
> and
>
> (def f (let [x 2] (fn [] x)))?
No, are you experiencing one?
Rich
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On May 27, 4:47 am, markgunnels wrote:
> Hopefully this doesn't get me booed off the message board but is there
> a Clojure equivalent to Ruby's ERB?
I don't think there is a Clojure equivalent (i.e. for general purpose
text generation), but given Clojure's great Java integration you could
easil
No, I was just worried that using def/defn not at the top level, but
inside a let, might have unforeseen consequences.
On Wed, May 27, 2009 at 3:48 AM, Rich Hickey wrote:
> No, are you experiencing one?
>
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You received this message because yo
Thanks for the help and your feedback, Steve!
Clojure needs some unit tests and I like writing them, so it is a win-
win situation :-)
Yes, this is our first test in clojure-contrib.test-clojure.vars. I
checked it in together with other changes as revision 846.
Frantisek
On May 26, 9:27 pm, "
> Here's the correct syntax:
>
> (ns namespace
>(:use [other-namespace :rename {existing newname}]))
aha, brackets. Is there a plan to flesh out the API page to have more
examples of things like that? As it stands, I think the API page is
probably great for somebody who needs a reminder, bu
Hi there
Find attached some code that uses apache velocity for command line based
processing, i.e. it's not setup for servlets; i use this as an offline
pre processor for web sites.
It does hierarchical templating of files in a source directory and
copies to a target directory. The templating ma
On May 27, 7:59 am, Frantisek Sodomka wrote:
> Thanks for the help and your feedback, Steve!
>
> Clojure needs some unit tests and I like writing them, so it is a win-
> win situation :-)
>
Let me add my thanks as well - this is a great (and otherwise
thankless :) contribution.
I also wanted
It seems to me that the first would be immune to redefining what
closure/core.let means at the point where f is invoked, while the
second one would not be.
I was unable to actually redefine closure/core.let - probably because
it is a macro. But some function was used in place of let, than it
coul
On May 27, 2009, at 17:11, Boris Mizhen - 迷阵 wrote:
> It seems to me that the first would be immune to redefining what
> closure/core.let means at the point where f is invoked, while the
> second one would not be.
No. Both definitions create a closure inside which x has the fixed
value 2. When
On May 27, 2009, at 1:03, aperotte wrote:
> I think I understand your point now. You would like the indexing to
> match the implicit dimension order of the nested structure.
Right.
> I was also concerned about storage order because I wanted to at some
> point integrate this datastructure with
Makes sense, thanks!
On Wed, May 27, 2009 at 11:30 AM, Konrad Hinsen
wrote:
>
> On May 27, 2009, at 17:11, Boris Mizhen - 迷阵 wrote:
>
>> It seems to me that the first would be immune to redefining what
>> closure/core.let means at the point where f is invoked, while the
>> second one would not b
+1 for better info on :use/:require. I find I tend to go digging into
the clojure-contrib source for decent examples just because I'm not
sure where else to look.
On May 27, 11:03 am, tsuraan wrote:
> > Here's the correct syntax:
>
> > (ns namespace
> > (:use [other-namespace :rename {existin
Thanks. This looks awesome.
On May 27, 10:28 am, ritchie turner wrote:
> Hi there
>
> Find attached some code that uses apache velocity for command line based
> processing, i.e. it's not setup for servlets; i use this as an offline
> pre processor for web sites.
>
> It does hierarchical templati
I wrote a patch for issue #13 a few weeks back, but it was right around
the 1.0 push, so I didn't want to destabilize things. Now seems like a
good time to discuss it:
http://code.google.com/p/clojure/issues/detail?id=13
This uses the reader to ensure that symbols and keywords have names that
billh04 wrote:
> I think you are responsible for ending the currently running
> agents. The usual method is to set up some field which the agents
> monitor looking for some value indicating the application is
> ending.
By "ending currently running agents" do you mean the action run on
the agent
Dear Clojurians,
this is the next iteration of my Ivy experiments
to provide a modular build of contrib. With the
support of Kresimir Sojat I restructured the build.
Previously the different contrib modules were
provided as configurations. This is now changed
in that every contrib module is also
I think you could do a hack using macros and eval at runtime in order
to expand them into your code, but I think one of the fellas in the
chat room said to be wary if that's the only approach I can see to a
problem, because it's easy to screw up, and not entirely good
practice.
Btw, does clojure
On May 26, 10:47 pm, markgunnels wrote:
> Hopefully this doesn't get me booed off the message board but is there
> a Clojure equivalent to Ruby's ERB? I'm try to use Clojure to perform
> code generation
I've had success with StringTemplate. Very functional design, easy to
call from Clojure. An
wow. the fact that people use java+somehatefullibs+xml and apparently
think that is something "good", completely drives me insane. i mean,
it isn't just additional bloat, it is more like
ackermann-function-scale bloat. gargh! has anybody done something
like:
1) convert the bloody XML to Clojure l
Hi,
I'm trying to write some macro-defining macros, and the recursive
backquotes are making my brain spin circles. Is there a macro writing
helper so that I can expand my macros level by level and see the
intermediate result?
I'm using macroexpand-1 right now, but it's not terribly useful as
back
Hi Drew,
I've been trying to recreate your issue
(defn forever[x] (while true (Thread/sleep 100) (print \-) (flush)))
(let [a (agent 0)] (send (agent 0) forever))
(println (Thread/activeCount) "threads active")
(shutdown-agents)
(println "I'm here")
;(System/exit 0)
Notably shutdown-agents i
Hello,
Here's what I've done in times past:
(ns process-xml-in-a-file
(:require [clojure.zip :as zip])
(:require [clojure.contrib.zip-filter.xml :as zfx])
(:require [clojure.xml :as xml]))
; creating list of all checkable instances
(def dev2-cfg-xml
(-> "c:/dl/tibsup/Prod_Stg_auto_shutd
Hi all,
I have some ruby code that I'm thinking of porting to clojure, but I'm
not sure how to translate this idiom to a functional world:
I have objects that are externally immutable, but have internal
mutable state they use for optimisation, specifically in this case to
defer un-needed calculat
Hello.
I am new to clojure, but try it.
code:
(defn get-size [filename]
(println 'size filename)
(count filename))
(defn get-quickhash [filename]
(println 'quickhash filename)
(hash (take 3 filename)))
(defn get-hash [filename]
(println 'hash filenam
Trouble here is, I only want to call the hash functions as needed.
This is doing file differencing, and if I only have a single file of
(say) 200 megabytes, I never need to calculate it's hash, as I'll
never actually compare it to another file of exactly the same size.
- Korny
On Thu, May 28, 20
Sounds like a job for lazy-map to me!
http://kotka.de/projects/clojure/lazy-map.html
On May 28, 11:52 am, Korny Sietsma wrote:
> Hi all,
>
> I have some ruby code that I'm thinking of porting to clojure, but I'm
> not sure how to translate this idiom to a functional world:
> I have objects that
On 27/05/2009, Baishampayan Ghose wrote:
..
> In the SLIME REPL, press , (comma) and then type 'quit' and press Enter.
>
> That'd close your REPL gracefully after which you can exit Emacs by
> pressing C-x C-c.
>
> Regards,
> BG
>
> --
Exactly what I wanted. Many thanks!
Regards,
Muhammad
> Ba
Hash calculation runs only when necessary, because
Clojure's map function is lazy now.
more sample code:
(nth (get-info "a.txt") 0)
(nth (get-info "b.txt") 0)
(nth (get-info "b.txt") 1)
result:
size a.txt
size b.txt
quickhash b.txt
Output result shows it.
When
(nth (get-info "a.txt") 0)
is ev
Yes that is a very elegant solution.
For convenience you might want another function:
(defn fast-compare
"Given two filenames returns true if the files are identical"
[fn1 fn2]
(let [i1 (get-info fn1), i2 (get-info fn2)]
(and (= (first i1) (first i2))
(= (second i1) (second i2))
On May 27, 2009, at 7:52 PM, Korny Sietsma wrote:
> How would I do this in a functional way? My first effort would be
> something like
>(defn hash [filename] (memoize (... hash function ...)))
> but I have a couple of problems with this:
> - it doesn't seem to store the hash value with the
On May 27, 2009, at 11:51 PM, Timothy Pratley wrote:
> I wonder if there is a more idiomatic way to compare two lazy
> sequences... lazily?
I came up with (some (complement zero?) (map compare list-1 list-2))
in my response which missed yours by seconds. :) I'm not sure it's
great but it doe
On May 26, 2009, at 10:56 PM, kyle smith wrote:
> Thanks for the feedback Daniel, I've incorporated your ideas and re-
> uploaded. I'm not sure where you're seeing mutable data structures.
I'm hallucinating, that's where. :)
> Anyhow, I now only call eval once each time scorer is called, whic
On Thu, May 28, 2009 at 7:58 AM, Daniel Lyons wrote:
>
>
> On May 27, 2009, at 11:51 PM, Timothy Pratley wrote:
>> I wonder if there is a more idiomatic way to compare two lazy
>> sequences... lazily?
>
> I came up with (some (complement zero?) (map compare list-1 list-2))
> in my response which
>> I wonder if there is a more idiomatic way to compare two lazy
>> sequences... lazily?
You can just use =.
(= seq1 seq2)
It works lazily.
user> (= (iterate inc 0) (map #(do (println %) %) [0 1 2 -3 4 5 6]) )
0
1
2
-3
false
How sweet!
2009/5/28 Daniel Lyons :
>
>
> On May 27, 2009, at 11:5
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