Just throwing Exception is discouraged in Java, because its the supertype
checked and unchecked exceptions. I often saw a JVM die of an unproper
exception handling -- mainly when NullPointerExceptions were involved. So we
are on the JVM, want Java interop and so my isistent recommendation is to
On Dec 2, 4:52 pm, Peter Wolf [EMAIL PROTECTED] wrote:
I vote that we take Merlyn's code as a base and put it on SourceForge.
I'll add my Lexer and Parser and work on formatting, parens matching and
coloring. Erik can add his REPL and completion stuff.
However, I think it would be polite
Apache Tapestry Creator to Speak on Clojure, Tapestry 5
Bangalore, December 10, 2008: If you are a Java developer building web-
based applications and tired of the countless frameworks that promise
you a slick UI fast but fail to live up to their promise, then switch
to Apache Tapestry to get
A while ago I uploaded an implementation of monads in Clojure to the
group's file section. I have now replaced it by a more or less complete
rewrite. This rewrite was motivated by one serious problem with the
original implementation, plus a number of minor points that I was not
happy with. I have
On Dec 10, 10:52 pm, Stephen C. Gilardi [EMAIL PROTECTED] wrote:
On Dec 10, 2008, at 4:38 AM, Ralf Bensmann wrote:
Being a Java trainer for a long time, we talk with students about
the handle-or-declare rule in Java and the two types of
exceptions: checked (declared) and unchecked
On Wed, Dec 10, 2008 at 11:28 PM, Randall R Schulz [EMAIL PROTECTED] wrote:
Hi,
I just found this article on Dr. Dobbs' Web site. It's dated Dec 3rd of
this year:
- It's Time to Get Good at Functional Programming
Subtitle: Is it Finally Functional Programming's Turn?
Timothy,
Your post is a great one indeed , you have developed a template that
anyone could use to introduce Clojure. I would implore to fresh out
thoughts and deepen it for all to enjoy.
Emeka
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You received this message because you are
Hi Darren,
Work continues. Merlyn has invited me to take over admin of the code.
I have taken Merlyn's code as a base, and am fleshing it out.
Currently, I am struggling though the lack of documentation and examples
for building a custom language plugin. I have implemented a Lexer, and
am
Hi all,
I thought I remembered there was a method in the api somewhere that
would count the frequency of each unique item in a collection, but I
can't find it anymore. What would be a brief way to write that in
clojure?
(In ruby: array.inject(Hash.new(0)) {|hash,key| hash[key] += 1 ;
hash})
On Dec 10, 2:59 pm, falcon [EMAIL PROTECTED] wrote:
Could you describe in-core editing a bit more? Sounds interesting.
The canonical structure editor (not structured editor) is probably
Interlisp-D's SEDIT, or its predecessor DEDIT. (See
On Dec 8, 7:44 pm, Dave Griffith [EMAIL PROTECTED] wrote:
The basic use case is as a guard for I/O, to prevent them from from
filling the disk/spamming the network accidentally in case of
transaction live-lock. Probably a bit more paranoia than is idiomatic
in the dynamically-typed world,
(defn frequencies [coll]
(reduce (fn [map val] (assoc map val (if (contains map val)
(get map val) 1)) #{})
)
On Dec 11, 9:21 am, bOR_ [EMAIL PROTECTED] wrote:
Hi all,
I thought I remembered there was a method in the api somewhere that
would count the frequency of each unique
I don't recall a histogram-like method, though I may just be forgetting.
(defn frequencies [coll]
(reduce
(fn [map val] (assoc map val (inc (get map val 1
{}
coll))
On Thu, Dec 11, 2008 at 9:33 AM, Dave Griffith
[EMAIL PROTECTED] wrote:
(defn frequencies [coll]
On Dec 11, 9:32 am, [EMAIL PROTECTED] [EMAIL PROTECTED]
wrote:
I don't know whether Rich regards the text of a Clojure program as the
source, or whether he thinks of the source as the data structure
created by the reader when it reads the text. In Common Lisp and some
older dialects, it's
Excellent! This is a great way of making code fail-fast for a class of
bugs that would normally only occur under load (i.e. at the worst
possible time).
--Dave Griffith
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On Thursday 11 December 2008 06:33, Dave Griffith wrote:
On Dec 11, 9:21 am, bOR_ [EMAIL PROTECTED] wrote:
Hi all,
I thought I remembered there was a method in the api somewhere that
would count the frequency of each unique item in a collection, but
I can't find it anymore. What would
On Dec 11, 9:21 am, bOR_ [EMAIL PROTECTED] wrote:
I thought I remembered there was a method in the api somewhere that
would count the frequency of each unique item in a collection, but I
can't find it anymore. What would be a brief way to write that in
clojure?
I think what you want is:
Yup, five bugs by my count. Not bad for a one-liner. More coffee
necessary.
Same algorithm, but tested.
(defn frequencies [coll]
(reduce (fn [map val] (assoc map val (if (contains? map val) (+ 1
(get map val)) 1))) {} coll)
)
On Dec 11, 9:52 am, Randall R Schulz [EMAIL PROTECTED]
I've added a slightly modified version to clojure.contrib.seq-utils:
(defn frequencies
Returns a map from distinct items in coll to the number of times
they appear.
[coll]
(reduce (fn [counts x]
(assoc counts x (inc (get counts x 0
{} coll))
-Stuart Sierra
Great article, but I'm not sure this part in the keyword section is
correct:
Keywords exist simply because, as you'll see, it's useful to have
names in code which are symbol-like but not actually symbols. Keywords
have no concept of being namespace qualified as they have nothing to
do with
On Thursday 11 December 2008 07:41, samppi wrote:
Great article, but I'm not sure this part in the keyword section is
correct:
Keywords exist simply because, as you'll see, it's useful to have
names in code which are symbol-like but not actually symbols.
Keywords have no concept of being
Konrad,
I haven't had a chance to look at this in depth but I did see two
things.
First, the function 'group' that you define seems to be the same as
Clojure's 'partition' function.
Second, when I tried to load monads, I get the following error.
java.lang.ExceptionInInitializerError
Can't say I understood all of it (being a LISP noob) but appreciate
the explanation.
Does the following fit into the current discussion?
Barista editor: http://faculty.washington.edu/ajko/barista.shtml
Barista editor is based on Citrus
http://faculty.washington.edu/ajko/citrus.shtml
The
Tim, just go ahead and make any changes you like. If I don't like
them, I can always revert ;) Actually, I'm sure anything you add we
can find a place for, but like I said, that would likely be a separate
example page in most cases.
Thanks, Randall, I mention keywords-as-functions where I talk
I think this might just be a JVM version issue. I can reproduce this
issue with a 1.5 JVM, but I can't reproduce it with 1.6.
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Well, I had the .clj files in my clojure.jar, and clojure.jar is on
slime-search-paths, but I still wasn't getting M-. to work with
clojure's functions and macros. I added the source files to my
classpath, and I get them now.
Also, I updated clojure and swank-clojure this morning, so it looks
It's been too long since I've looked at this thread...
I took a look at the mode you linked. My mode is quite a bit more
powerful, particularly with the changes I added today. The linked
mode does do some highlighting of special forms like @[...] that mine
doesn't do yet, mainly because I
Oh, also I should mention that I found the magic incantation to make
auto-indentation work perfectly. It handles multiple unindents just
fine now.
Daniel
On Dec 11, 12:34 pm, Daniel Spiewak djspie...@gmail.com wrote:
It's been too long since I've looked at this thread...
I took a look at
On Dec 10, 2:15 pm, Simon Brooke still...@googlemail.com wrote:
I note people seem mainly to be using Emacs as an editing/development
environment for Clojure. But as people keep pointing out, Clojure is
homoiconic; the canonical source of a function is not a stream of
bytes read from a
On Thursday 11 December 2008 10:34, Daniel Spiewak wrote:
It's been too long since I've looked at this thread...
I took a look at the mode you linked. My mode is quite a bit more
powerful, particularly with the changes I added today. ...
Where do we find your latest version? Or do you want
Wo-hoo! I found a fix.
I think it is only a JVM issue to the extent that the 1.6 JVM might be
able to mask the bug by doing escape analysis or some such other
magic, but that dosn't mean that the bug isn't there.
It's a super-simple little thing, and I can't imagine a CA is needed
to apply it.
I understand how Clojure lets you consume Java objects, and pass
Clojure objects to Java programs.
However, it is not uncommon for Java libraries to be designed in such
a way that you need to create a subclass of something in the library
in order to make use of the library. I don't understand
Hi, (very new to clojure, emacs and lispish things)
I am using the latest downloadable clojure (rather than SVN, which I
do have and see it is a bit different) in Aquamacs. I have installed
the clojure mode and am using it with inferior-lisp to see output.
When looking at the source for the
Hi, just saw this thread. I had made some modifications to the edit mode and
uploaded it for inclusion (as a patch) here:
http://sourceforge.net/tracker/index.php?func=detailaid=2201893group_id=588atid=300588
.
I haven't checked the status in a while as my internet is very intermittent
ATM.
On Dec 11, 7:06 am, Alex Burka zapper3...@gmail.com wrote:
To the debate on whether there should be examples early in the text,
here are my two cents:
When I click on something called Learning [programming language] I
like to see a representative example of the syntax early on. If
On Dec 11, 2008, at 3:23 PM, Kevin Downey wrote:
your problem is '
' makes xml/parse a symbol and stops evaling it to a function
symbols are callable like keywords so if you have a hash with symbols
as keys you can
('a {'a 1 'b 2}) - 1
so ('xml/parse /Users/me/correct/path/to/my.xml) is
Isn't it just asking for confusion?
I really like that maps are functions of their keys though.
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On Dec 11, 2008, at 3:25 PM, Shawn Hoover wrote:
On Thu, Dec 11, 2008 at 3:01 PM, Robert Koberg r...@koberg.com wrote:
Hi, (very new to clojure, emacs and lispish things)
I am using the latest downloadable clojure (rather than SVN, which I
do have and see it is a bit different) in
This article has a good example using the proxy function.
http://gnuvince.wordpress.com/2008/11/18/fetching-web-comics-with-clojure-part-2/
On Thu, Dec 11, 2008 at 1:22 PM, Randall R Schulz rsch...@sonic.net wrote:
On Thursday 11 December 2008 11:31, Mark Engelberg wrote:
I understand how
On Dec 11, 2008, at 3:44 PM, Robert Koberg wrote:
Hi again,
I see the default ContentHandler implementation does not handle XML
Namespaces. Is that the case or does the :xmlns symbol
I meant keyword (I think) here. For example, say I have /xml/ like:
{:tag :my-root, attrs {:xmlns:x
On Thursday 11 December 2008 12:54, Daniel Spiewak wrote:
Where do we find your latest version? Or do you want / need to
refine it further?
I'm constantly messing around with it and trying to make it a little
better. The very latest version is always here:
Hi, just saw this thread. I had made some modifications to the edit mode and
uploaded it for inclusion (as a patch)
here:http://sourceforge.net/tracker/index.php?func=detailaid=2201893grou...
.
I haven't checked the status in a while as my internet is very intermittent
ATM. Please let me
Where do we find your latest version? Or do you want / need to refine it
further?
I'm constantly messing around with it and trying to make it a little
better. The very latest version is always here:
http://github.com/djspiewak/jedit-modes/tree/master/clojure.xml
Daniel
I've been reading the latest chapter from Stuart's book, Chapter 7:
Macros, and he makes this statement:
Clojure has no special syntax for code. Code is simply Clojure data.
This is true for normal functions, but also for special forms and
macros. Consider a language with syntax, such as Java.
If we have the following map:
(def m {:key 1 'sym 2 str 3})
The following are equivalent:
(:key m)
(m :key)
As are the following:
('sym m)
(m 'sym)
I think the commutativity of maps with symbols and keywords is a
valuable and good thing. I realize that the String class doesn't
implement the
On Thursday 11 December 2008 12:54, Daniel Spiewak wrote:
Where do we find your latest version? Or do you want / need to
refine it further?
I'm constantly messing around with it and trying to make it a little
better. The very latest version is always here:
On Thursday 11 December 2008 13:37, Paul Barry wrote:
I've been reading the latest chapter from Stuart's book, Chapter 7:
Macros, and he makes this statement:
Clojure has no special syntax for code. Code is simply Clojure data.
This is true for normal functions, but also for special forms
That was one of the best explanations of code as data I've ever read.
Kudos!
On Thu, Dec 11, 2008 at 4:44 PM, Randall R Schulz rsch...@sonic.net wrote:
On Thursday 11 December 2008 13:37, Paul Barry wrote:
I've been reading the latest chapter from Stuart's book, Chapter 7:
Macros, and he
On Dec 11, 4:44 pm, Randall R Schulz rsch...@sonic.net wrote:
All these things are syntactic sugar. Shorthand ways to write things
that have vanilla S-Expression counterparts. Again, I would not call
them syntax.
syntactic sugar is not syntax?
Nice job finding it ...! Once I could not reproduce it on JDK 6, I
stopped looking for a real answer.
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On Dec 11, 2:28 pm, Christian Vest Hansen karmazi...@gmail.com
wrote:
Wo-hoo! I found a fix.
I think it is only a JVM issue to the extent that the 1.6 JVM might be
able to mask the bug by doing escape analysis or some such other
magic, but that dosn't mean that the bug isn't there.
It's
--- On Thu, 12/11/08, Paul Barry wrote:
syntactic sugar is not syntax?
I think that depends on which particular nits are being picked.
Is it strictly true that Clojure has no syntax? Meh--probably not.
(defun foo [bar] ...) has more unique characters than (defun foo (bar) ...) or
(define
On Dec 11, 4:37 pm, Stefan Rusek sru...@gmail.com wrote:
If we have the following map:
(def m {:key 1 'sym 2 str 3})
The following are equivalent:
(:key m)
(m :key)
As are the following:
('sym m)
(m 'sym)
I think the commutativity of maps with symbols and keywords is a
valuable
My view is that Lisps have very a simple syntax, achieved at the cost
of moving a fair amount of error checking until runtime. If you
ignore reader macros, you can tell if a Clojure expression is well-
formed by just keeping a count of open parentheses, which is about the
least amount of state
On Dec 11, 5:56 pm, Rich Hickey richhic...@gmail.com wrote:
On Dec 11, 2:28 pm, Christian Vest Hansen karmazi...@gmail.com
wrote:
Wo-hoo! I found a fix.
I think it is only a JVM issue to the extent that the 1.6 JVM might be
able to mask the bug by doing escape analysis or some such
I removed the pred and memoize libs from clojure.contrib today.
The most useful functions formerly in pred and the only function in
memoize are now defined in clojure.core.
--Steve
smime.p7s
Description: S/MIME cryptographic signature
Hi Bill,
it seems I found the tick with swank-clojure, slime and emacs.
Swank/clojure works only if the user is not root. (Or so it seems on
my linux setup)
Following your instructions on http://bc.tech.coop/blog/081023.html
if the user is root, swank-clojure spawns a server listening on a
given
On Dec 10, 2008, at 1:50 PM, Stephen C. Gilardi wrote:
On Dec 10, 2008, at 8:51 AM, Stuart Halloway wrote:
Thanks for the info. Is this limitation of user.clj arbitrary, or
motivated by some concern that the average Clojure user should know
about? Is the a reason not to load the bindings
Hi,
Would it be desirable to further define keywords such that it allows a
special kind of namespacing.
* This could allow for more efficient (for the user) and targeted
navigation over large, nested collections.
* It would allow for mixing related data that might need to be treated
in
My apologies,
found the error. It was the linux setup.
The portmap daemon was interfering with the swank server.
If the portmap is stopped, everything works fine.
Running everything as a root?
I like to live on the edge of a cliff, gives me a nice buzz high ;-)
You don`t?
Bye,
mosi
On Dec 12,
On Dec 11, 2008, at 7:24 PM, Rich Hickey wrote:
I am interested in the issues you are trying to address, and thanks
for volunteering!
Excellent. You're welcome.
I'd like to try to focus our efforts on release 1.0.
Sounds good.
Towards that end, it would be nice if your repl code got
I merged in all the interesting stuff from David Moss's Clojure jEdit
mode. We do highlight things in very different colors, but all of the
elements that his recognizes are also recognized by mine now. Also, I
fixed the annoying issue with def:
(def this)(def that)
The above now highlights
Hi,
Given an XML structure like:
root xmlns:dc=http://purl.org/dc/elements/1.1/;
fragment xmlns:xyz=http://www.w3.org/1999/xhtml;
dc:titleA HEAD Title/dc:title
xyz:titleA BODY Title/xyz:title
/fragment
fragment xmlns:zyx=http://www.w3.org/1999/xhtml;
dc:titleA HEAD
On Thu, Dec 11, 2008 at 7:49 PM, Robert Koberg r...@koberg.com wrote:
Hi,
Would it be desirable to further define keywords such that it allows a
special kind of namespacing.
* This could allow for more efficient (for the user) and targeted
navigation over large, nested collections.
* It
On Programming Clojure I read:
The method-as-function idiom is a common one, so Clojure provides
the memfn macro to wrap methods for you:
(map (memfn toUpperCase) [a short message])
- (A SHORT MESSAGE)
But one could already write:
(map #(.toUpperCase %) [a short message])
- (A SHORT
I like the second form better, and may remove memfn from the book
entirely.
Stuart
On Programming Clojure I read:
The method-as-function idiom is a common one, so Clojure provides
the memfn macro to wrap methods for you:
(map (memfn toUpperCase) [a short message])
- (A SHORT MESSAGE)
On Thu, Dec 11, 2008 at 7:44 PM, Oscar Picasso oscarpica...@gmail.com wrote:
(map (memfn toUpperCase) [a short message])
- (A SHORT MESSAGE)
But one could already write:
(map #(.toUpperCase %) [a short message])
- (A SHORT MESSAGE)
Are they cases where we cannot use the second form and
Hi,
The same hello world did not work for me.
The error msgs are:
(defn hello-world []
(qt4
(let [app (QCoreApplication/instance)
button (new QPushButton Go Clojure Go)]
(.. button clicked (connect app quit()))
(doto button
(resize 250 100)
(setFont (new
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of fun, up until things
user (sort (re-seq #\w+ the quick brown fox))
(brown fox quick the)
but
user (sort (re-seq #q(u(i))? the quick brown fox))
([qui ui i])
Why it's not sorted on the later case?
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On Mon, Dec 8, 2008 at 6:51 PM, Rich Hickey richhic...@gmail.com wrote:
I don't have the latest build of Clojure with atoms, so I
reimplemented Rich's filter solution using refs, turning:
(defn filter
[pred coll]
(let [sa (atom (seq coll))
step (fn step []
cool. was wondering if this was possible the other day myself :)
Good to know RH crew have accounted for this possibility already.
s_P
On Dec 11, 10:08 pm, Chouser chou...@gmail.com wrote:
On Thu, Dec 11, 2008 at 7:49 PM, Robert Koberg r...@koberg.com wrote:
Hi,
Would it be desirable to
In the latter case the result is a seq containing a single element:
the vector. There is nothing to sort/it us sorted.
--Steve
On Dec 12, 2008, at 12:14 AM, Oscar Picasso oscarpica...@gmail.com
wrote:
user (sort (re-seq #\w+ the quick brown fox))
(brown fox quick the)
but
user (sort
Slightly shorter version:
(defn frequencies
Returns a map from distinct items in coll to the number of
times they appear.
[coll]
(reduce (fn [counts x]
(merge-with + counts {x 1}))
{} coll))
On Dec 11, 9:14 am, Stuart Sierra
Clojure does not allow for programmer-defined
reader macros (unlike other lisps).
I know this has been touched upon last Spring - and Stu Halloway refs
at least one discussion of this in his book.
From a practical standpoint I am beginning to understand more why the
choice was made to not
Clojure does not allow for programmer-defined
reader macros (unlike other lisps).
I know this has been touched upon last Spring - and Stu Halloway refs
at least one discussion of this in his book.
From a practical standpoint I am beginning to understand more why the
choice was made to not
If you wanted to extend deref to new types, is there any way to do
that? For example, deref of a delay could be equivalent to a force.
Or deref of a Future could invoke the Future's get method. This would
give you the handy @ reader macro for things that frequently need to
be forced to evaluate
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