Thanks for sharing Sean, very interesting!
Ambrose
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I just wanted to share this experience from World Singles...
Back in November 2009, we started developing with Scala. We needed a
long-running process that published large volumes of changes from our
member database as XML packets published to a custom search engine.
The mapping from half a dozen
On Tue, Sep 6, 2011 at 7:32 PM, julianrz wrote:
> I come from Scala experience, where it is easy to define a quick
> lambda function returning a constant or another simple expression,
> e.g. "=> true" is a function with no args and returning true. Things
> like that are sometimes useful to pass in
On 7 September 2011 01:17, Justin Kramer wrote:
> Prompted by a question on IRC a couple days ago, I built a tool that allows
> you to browse the dependency graph of Clojure projects from GitHub &
> Clojars:
>
> http://clojuresphere.herokuapp.com/
>
> You can see dependencies of a project, but al
On Sep 6, 2011, at 10:43 PM, Armando Blancas wrote:
> For something like "=> true" try:
> user=> (defmacro => [expr] `(fn [] ~expr))
> #'user/=> (macroexpand-1 '(=> true))
> (clojure.core/fn [] true)
Alternatively: (constantly true)
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> (#(true)), is this not calling a function that has no arguments and
> returns true? But it still gives same exception
Not really:
user=> (macroexpand-1 '#(true))
(fn* [] (true))
> I guess I should forgo the macro
> and go directly with (fn [] true)
For something like "=> true" try:
user=> (de
I'm confused about the notes on section 2.2 Better Exception
Reporting.
There is a link to the Error Handling notes but it only lists several
approaches for handling errors, but it doesn't describe how messages
will be reported better in this release.
I feel this would be a good place to provide
On Tue, Sep 6, 2011 at 9:13 AM, Meikel Brandmeyer (kotarak)
wrote:
> user=> (def foo "A foo" :foo)
> #'user/foo
> user=> (doc foo)
> -
> user/foo
> A foo
> nil
Hrm. Doc on a var not bound to a function or macro doesn't print its
(default) value?
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Protege: What is th
I too used to do lein swank from the cmd prompt and then used to load emacs
and then used to M-x slime-connect.
However I've come to know three modes in emacs - multi-term, shell and
eshell mode (which is like a command prompt in emacs), so you can do M-x
multi-term, M-x shell or M-x eshell.
E
Thanks, I realize my example is a bit of a corner case, and feels a
little artificial:) It came after some narrowing down a larger problem
Another thing that appeared curious to me, is that Clojure apparently
counts unique %'s inside the #() definition to determine arity of the
macro. But does thi
Thanks, glad you like it.
Note that dependents are listed for an artifact ID ("clojure-contrib") when
any version of the dependent depends on any version of that artifact ID. So
some of those libs may have already migrated to the new clojure contrib
libs. Clicking a version will show which spec
On Sep 6, 11:20 am, Michael Jaaka
wrote:
> Btw. it looks like Clojure is missing an ability to program reader.
>
> It would allow to program a syntax.
This is by design as there is no good way to namespace syntax.
> The tail recursion and continuations also would be awesome.
Those aren't provided
> Am Dienstag, 6. September 2011 schrieb Alasdair MacLeod :
> I guess the only gotcha is if a function treats the record as a map
> and
> tries to access a field by putting the record in function position:
>
> user=> (defrecord Person [first last])
> user.Person
> user=> ((Person. "Joe" "Bloggs"):
On Tue, Sep 6, 2011 at 8:17 AM, Justin Kramer wrote:
> Prompted by a question on IRC a couple days ago, I built a tool that allows
> you to browse the dependency graph of Clojure projects from GitHub &
> Clojars:
> http://clojuresphere.herokuapp.com/
This is very cool Justin!
I see that clojure.
Am Dienstag, 6. September 2011 schrieb Alasdair MacLeod :
>
> I guess the only gotcha is if a function treats the record as a map
> and
> tries to access a field by putting the record in function position:
>
> user=> (defrecord Person [first last])
> user.Person
> user=> ((Person. "Joe" "Bloggs"):f
As Laurent says, you should just use the built-in `identity` function,
but you can write it yourself: as you noticed, (fn [x] x) works, but
if you want to do it with the shorthand syntax you can use #(do %).
On Sep 4, 1:56 pm, julianrz wrote:
> Hello All,
> I am new to Clojure. Surprised why this
2011/9/4 julianrz
> Hello All,
> I am new to Clojure. Surprised why this code does not work:
>
> user=> (filter #(%) [1 2 3])
> ClassCastException java.lang.Long cannot be cast to clojure.lang.IFn
>
> Here my intent behind #(%) is to define a lambda function returning
> its argument. Since Clojur
> The types created by defrecord implement the same interfaces as maps,
> so they can be used as maps.
I guess the only gotcha is if a function treats the record as a map
and
tries to access a field by putting the record in function position:
user=> (defrecord Person [first last])
user.Person
use
Hello All,
I am new to Clojure. Surprised why this code does not work:
user=> (filter #(%) [1 2 3])
ClassCastException java.lang.Long cannot be cast to clojure.lang.IFn
Here my intent behind #(%) is to define a lambda function returning
its argument. Since Clojure defines truth on any type, it sh
On 4 September 2011 20:40, Dennis Haupt wrote:
>
> Am 04.09.2011 19:08, schrieb Justin Kramer:
>> On Sunday, September 4, 2011 12:21:23 PM UTC-4, HamsterofDeath
>> wrote:
>>
>>
>> Some other comments:
>>
>> - Nested defns are not good.
>
> why? imo, nested function/method definitions are a tool to
Yes, keeping track of all those versions is tricky. At the moment, the Lein
method in emacs seems simple enough. We'll see.
On Sat, Sep 3, 2011 at 10:06 PM, Li Zhixiong wrote:
> Basically, the problem I get is due to version conflict between
> swank-clojure and slime, I download the same version
Thanks, that's a good idea and best of all, it's working for me! I didn't
know the Mx cd command to change default directory.
On Sep 3, 2011 9:40pm, Benny Tsai wrote:
Sorry, what I meant to say in the last line is:
And as long as you start emacs somewhere in your lein project directory
(o
On 09/06/2011 08:42 AM, Paul Stadig wrote:
So far all I have done is update the bundled ASM and modify
Clojure to emit Java7 class files, but I'm getting VerifyErrors
(same as Tal). It's possible that this is a bug in the way that
ASM automatically calculates
And last tough is that maybe there should be a build in support for
trees.
Trees are to maps like lists to vectors.
They have different characteristic on CRUD operations and CPU/RAM
resources.
With reader macros it would be possible to implement it by even not
bothering Rich Hickey.
Also there is
The clojure.contrib.combinatorics/combinations does do exactly what I
was trying to do, although I was doing the problem as an exercise in
how to do it, and not in really needing combinations for something
else. The combinatorics library certainly does it in a more generic
way.
Since I knew that I
Btw. it looks like Clojure is missing an ability to program reader.
It would allow to program a syntax.
==
9. The whole language always available. There is no real distinction
between read-time, compile-time, and runtime. You can compile or run
code while reading, rea
Well, these attempts stop very quickly.
But I have found code extract from the book
http://lib.store.yahoo.net/lib/paulgraham/onlisp.lisp
maybe someone with good knowledge could port it?
On Sep 2, 1:16 pm, Eric Lavigne wrote:
> > Is there any project on github which goal is to implement all co
On Tue, Sep 6, 2011 at 11:28 AM, Chouser wrote:
> On Tue, Sep 6, 2011 at 11:17 AM, Justin Kramer wrote:
>> Prompted by a question on IRC a couple days ago, I built a tool that allows
>> you to browse the dependency graph of Clojure projects from GitHub &
>> Clojars:
>> http://clojuresphere.heroku
On Tue, Sep 6, 2011 at 11:17 AM, Justin Kramer wrote:
> Prompted by a question on IRC a couple days ago, I built a tool that allows
> you to browse the dependency graph of Clojure projects from GitHub &
> Clojars:
> http://clojuresphere.herokuapp.com/
Very nice! Thanks for creating this.
--Chou
Prompted by a question on IRC a couple days ago, I built a tool that allows
you to browse the dependency graph of Clojure projects from GitHub &
Clojars:
http://clojuresphere.herokuapp.com/
You can see dependencies of a project, but also projects which depend on it.
You can also see how many p
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Am 06.09.2011 16:28, schrieb Meikel Brandmeyer (kotarak):
>
> Am Dienstag, 6. September 2011 15:57:16 UTC+2 schrieb Mark
> Rathwell:
>
> You want an anonymous function:
>
> (fn [x] (= x 2))
>
> or the equivalent shorthand form:
>
> #(= % 2)
>
> O
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>
> or the equivalent shorthand form:
>
> #(= % 2)
>
should i ever write a bigger app with clojure, it will be filled with
these. i like them.
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Am Dienstag, 6. September 2011 15:57:16 UTC+2 schrieb Mark Rathwell:
>
> You want an anonymous function:
>
> (fn [x] (= x 2))
>
> or the equivalent shorthand form:
>
> #(= % 2)
>
Or even more short-hand: #{2} (for all 2s not in #{nil false})
Scary.
Sincerely
Meikel
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> It was not a syntax error. Your expression just had the wrong
> return value. I don't see how an IDE could help here.
>
>
by type inference. i don't know how far an ide could track the types
in clojure since it's completely lacking any type ann
You want an anonymous function:
(fn [x] (= x 2))
or the equivalent shorthand form:
#(= % 2)
Sent from my iPhone
On Sep 6, 2011, at 9:35 AM, Dennis Haupt wrote:
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>
> figured it out, i the () were a bit messed up. the working code:
>
> (def op
Hi,
On Tuesday, September 6, 2011 3:35:08 PM UTC+2, HamsterofDeath wrote:
>
>
> (every? (= parameter player) currow
> i'd like to write something like:
>
> do i have to define the function via letfn before, or is there a way
> to do it nested in the code?
>
you can create a function anytime using
I started on some work to use invokedynamic instructions (instead of
reflection) for calling Java interop. I based my work on 1.3beta2, and my
goal was just to see how much of a performance difference it could make (if
any).
So far all I have done is update the bundled ASM and modify Clojure to em
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thx, that's what i figured out a moment ago. i am used to allknowing ides
Am 06.09.2011 15:25, schrieb Stefan Kamphausen:
> hi,
>
> why does clojure want to cast the result to IFn?
>
>
> if I parse that correctly, you have two parens around the
>
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figured it out, i the () were a bit messed up. the working code:
(def open 0)
(def p1 1)
(def p2 2)
(def emptyfield [open open open open open open open open open])
(defn indexOf [x y] (+ x (* y 3)))
(defn withmove [x,y,player,field]
(assoc field (
hi,
> why does clojure want to cast the result to IFn?
>
if I parse that correctly, you have two parens around the let-expression.
That leads to Clojure evaluating the let-expression, taking the result
(which is the return value of the line you mentioned: a Boolean) and trying
to call that as
user=> (def foo "A foo" :foo)
#'user/foo
user=> (doc foo)
-
user/foo
A foo
nil
Sincerely
Meikel
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i tried using letfn insteaf of defn for inner functions.
(def open 0)
(def p1 1)
(def p2 2)
(def emptyfield [open open open open open open open open open])
(defn indexOf [x y] (+ x (* y 3)))
(defn withmove [x,y,player,field]
(assoc field (indexOf
http://dev.clojure.org/display/doc/1.3
def's can already have doc strings, though it's not very convenient:
(def ^{:doc "documentation"} x 1)
Can someone give me a simple example?
// Ben
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On 6 Sep, 2011, at 12:43 , Sam Aaron wrote:
>> I have added a plain function not= to clojure.algo.generic.comparison as a
>> convenience, it is just the negation of generic =.
>
> Would this still allow the overriding of not= to do somethign different to
> the negation of generic =. If not, how
On 6 Sep 2011, at 11:33, Konrad Hinsen wrote:
>
> I must assume that nobody read that message, as there should have been loud
> complaints. There is obviously no difference in performance between = and
> not=, as the result of either one is known as soon as one can decide equality
> OR non-equ
On 1 Sep, 2011, at 14:51 , Konrad Hinsen wrote:
> On 1 Sep, 2011, at 10:35 , Alan Malloy wrote:
>
>> I don't see any reason for it to include !=, which can be implemented
>> as (not (= a b)). Conversely, <= could be implemented as (or (< a b)
>> (= a b)), but if either of those is expensive opera
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