Hi,
On Thu, Apr 22, 2010 at 20:17, Base basselh...@gmail.com wrote:
say i have a string that contains a form:
(+ 1 1)
I want to actually execute this. How do you do this? I thought that
eval would be able to handle this but apparently am misunderstanding
what eval does.
You need to read
On Thursday 22 April 2010 14:17:15 Base wrote:
Hi!
say i have a string that contains a form:
(+ 1 1)
I want to actually execute this. How do you do this? I thought that
eval would be able to handle this but apparently am misunderstanding
what eval does.
`eval' evals a form, so first
On 2010 Apr 22, at 8:17 AM, Base wrote:
say i have a string that contains a form:
(+ 1 1)
I want to actually execute this. How do you do this? I thought that
eval would be able to handle this but apparently am misunderstanding
what eval does.
Well, eval is the second half of what you want.
Thank you all!
I knew there was something simple that i was missing!
On Apr 22, 7:28 am, Douglas Philips d...@mac.com wrote:
On 2010 Apr 22, at 8:17 AM, Base wrote:
say i have a string that contains a form:
(+ 1 1)
I want to actually execute this. How do you do this? I thought that
Oh, really no answer ? :'(
2010/4/21 Laurent PETIT laurent.pe...@gmail.com:
Hello,
I've consulted a lot of already made presentations of clojure.
They are great, but I guess they may not suit my needs because it
seems to me that either:
* they are more 1 1/2 to 2 hours talks than 45
I made one simple and short one for beginners, I think to your liking, but
in Dutch...
2010/4/22 Laurent PETIT laurent.pe...@gmail.com
Oh, really no answer ? :'(
2010/4/21 Laurent PETIT laurent.pe...@gmail.com:
Hello,
I've consulted a lot of already made presentations of clojure.
They
2010/4/22 Joop Kiefte iko...@gmail.com:
I made one simple and short one for beginners, I think to your liking, but
in Dutch...
too bad I don't speak Dutch :-(
2010/4/22 Laurent PETIT laurent.pe...@gmail.com
Oh, really no answer ? :'(
2010/4/21 Laurent PETIT laurent.pe...@gmail.com:
Could I still take a look at it, to see the kind of examples you
provided (are the source code examples in english ?)
2010/4/22 Laurent PETIT laurent.pe...@gmail.com:
2010/4/22 Joop Kiefte iko...@gmail.com:
I made one simple and short one for beginners, I think to your liking, but
in Dutch...
Douglas Philips d...@mac.com writes:
Looking at the clojure.org front page, there is no roadmap link, or
anything that seems to be like that, to know what is on the radar,
There's no formal roadmap as such, most open-source projects just don't
tend to work that way.
Working notes and ideas
I would choose the one with glassfish which includes the web app things that
even though you may not need immediately(if compojure comes with embedded
jetty) will be very likely in the future when you use other app
containers(be it GAE or tomcat etc.)
I picked the base Java SE version and needs
On Apr 22, 2010, at 14:28 , Douglas Philips wrote:
eval can be a dangerous thing to use, you have to be very careful about where
the source has come from, in terms of trusting that the code your programs
'eval's will not be malicious or dangerous in some way. There are no absolute
rules
Stu,
Good book!
It was pretty clear to me that it was a snapshot. It was really a
user error on my part. Now that I have made that error, I won't make
it again.
Thanks,
Neal
On Apr 21, 9:31 am, Stuart Halloway stuart.hallo...@gmail.com wrote:
The second level header tells you the branch
Alex,
Yes. I was using the snapshot. My bad.
Neal
On Apr 21, 8:11 am, Alex Osborne a...@meshy.org wrote:
Hi Neal,
Neal neal_degrego...@yahoo.com writes:
I'm trying to use duck-streams, but it is missing from the clojure-
contrib JAR file (at least in build #81). I have listed the
OK. Thanks everyone for your help.
Neal
On Apr 21, 8:11 am, Alex Osborne a...@meshy.org wrote:
Hi Neal,
Neal neal_degrego...@yahoo.com writes:
I'm trying to use duck-streams, but it is missing from the clojure-
contrib JAR file (at least in build #81). I have listed the contents
of
I thought there might be a performance reason in there. Thanks for the
pointer to clj-time. Looks like a huge improvement over java date/calendar.
BTW: love the book. Mine is already getting dog eared.
On Apr 21, 2010 8:24 AM, Stuart Halloway stuart.hallo...@gmail.com
wrote:
The built-in Java
(defn rotate [n s]
(let [[front back] (split-at (mod n (count s)) s)]
(concat back front)))
Don't forget (mod n 0) is an ArithmeticException.
Harvey
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Hi!
I'm learning Clojure and trying some Google Code Jam exercises.
I am more or less satisfied with the style of algorithms I write, but
I would like to know how to do input/output. I want it to be Clojure
style (terse/functional/efficient) not just rewriting the usual
loops...
Take a look at
Oh wow... totally would have :)
On Apr 21, 8:16 pm, Harvey Hirst hhi...@gmail.com wrote:
(defn rotate [n s]
(let [[front back] (split-at (mod n (count s)) s)]
(concat back front)))
Don't forget (mod n 0) is an ArithmeticException.
Harvey
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How about this?
(use 'clojure.contrib.str-utils 'clojure.contrib.duck-streams)
(defn parse [file]
(let [r (reader file)]
(map (fn [line] (map #(Integer/parseInt %) (.split line )))
(take (Integer/parseInt (.readLine r)) (repeatedly
#(.readLine r))
(defn unparse [xss file]
You'll want to take a look at the docs for c.c.string[1], so have that
open in another tab. Anyway, let's assume you have the data in a file
mytext.txt
First, load the raw data with the slurp fn
user=(def raw-string (slurp mytext.txt))
Next, you'll want to use the split-lines fn to create a
I really hate how GMail line wraps without giving you a chance to
preview before sending.
Here's a version of parse that shouldn't line wrap. It also more
closely parallels unparse by using for instead of map:
(defn parse [file]
(let [r (reader file)]
(for [line (take (Integer/parseInt
I have been doing some work cleaning up the design and implementation
of datatypes and protocols in preparation for the 1.2 release. Some
notable changes for those who have been working with the earlier
versions:
deftype/reify now take an explicit 'this' argument in method sigs.
The :as option is
I tried using deftype relatively recently, but realized it wouldn't
work for my needs because serialization via *print-dup* wasn't yet
implemented. I'd recommend including this with the 1.2 release (or is
there a new recommended way to serialize Clojure data?)
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Hi!
In general, what to give greater attention if I'm getting lots of
runtime errors due to mistyped keywords? (eg. I'm referencing a map
where the keyword is non-existent and this nil value goes deep down into
my code where it is very hard to see that this was caused by a
non-existing map
Hi Istvan,
I've run into this a fair bit too. To catch such problems (at
runtime), I sprinkle my code with (safe-get m :key) in key places,
rather than (:key m) or (m :key) or (get m :key). safe-get:
(defmacro lazy-get
Like get but lazy about evaluating default
[m k d]
`(if-let [pair#
On 22.04.2010, at 18:53, Rich Hickey wrote:
Feedback and errata welcome as always,
One feature in the deftype/defrecord split that I regret is that defrecord no
longer allows the redefinition of equals and hashCode. Any attempt to override
those results in an error message about duplicate
On protocols:
- doc string coming after the arg vecs seems odd. I'm used to putting
them after the name of whatever I'm working on.
On protocols doc:
- You can implement a protocol on nil ... Object: could you
elaborate on how these work and/or provide examples? I think this will
solve the one
A good place to look for examples is protocols.clj and gvec.clj in
clojure itself. protocols.clj includes an example of implementing a
protocol on nil.
Stu
On protocols:
- doc string coming after the arg vecs seems odd. I'm used to putting
them after the name of whatever I'm working on.
On Apr 19, 2010, at 7:52 , Heinz N. Gies wrote:
Hi phil,
thanks for the answer many good points there. So just to be sure, if I don't
add a :gen-class (which I don't need to in my case) I can use the lib with
both 1.1 and 1.2 w/o problems (save for the named ones) so the lein jar jar's
+1, I am also using this feature of the old deftype.
On Apr 22, 12:15 pm, Konrad Hinsen konrad.hin...@fastmail.net wrote:
On 22.04.2010, at 18:53, Rich Hickey wrote:
Feedback and errata welcome as always,
One feature in the deftype/defrecord split that I regret is that defrecord no
longer
Is there a Dutch version of Clojure ?!?!?! I want one in French
then :
(Laurent you just said you like to be bashed didn't you ? :)))
Luc
On Thu, 2010-04-22 at 15:09 +0200, Laurent PETIT wrote:
Could I still take a look at it, to see the kind of examples you
provided (are the source code
We store routing rules in a database as Clojure code and get these to be
loaded dynamically and run according to some variable configuration.
Of course we make sure the code forms are stringent in the database and
we wrap execution of these things with proper error handling code :)))
That's one
Ah, great! And of course the piece I as missing is that nil and
Object get supported via extend. Makes sense now given that that was
the section of the doc, but it didn't click the first time through.
On Apr 22, 2:54 pm, Stuart Halloway stuart.hallo...@gmail.com wrote:
A good place to look for
Minor errata barely worth mentioning:on the page: http://clojure.org/datatypes
employeee.getName()
employeee needs just 2 'e' characters.
Cheers.
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When it comes to naming factory functions—functions that create things—
clojure.core gives four precedents:
1. Name it exactly what the new object is called. vector, hash-map,
set.
2. Name it a shortened version of #1. vec.
3. Prefix #1 with make-. make-hierarchy, make-array.
4. Prefix #1 with
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