So this has just happened to me again:
Clojure 1.5.1
(plugin.psi/symbol? 2)
=> false
(filter plugin.psi/symbol? [1 2 3])
=> (1 2 3)
((var-get #'plugin.psi/symbol?) 2)
=> (clojure.core/instance?
org.jetbrains.plugins.clojure.psi.api.symbols.ClSymbol 2)
What that looks like to me is that the macro
What's the latest opinion on parsing and representing clojure code as data?
I'm talking about representations suitable for code analysis; representing
the definition of the program as specified by the programmer.
As opposed to:
1. a representation of the program implied by the source code (aka
Hello!
I am interested in knowing more about the Object Behavior system presented
by Chris Granger at Conj 2012. I find it really clean and the idea of
having objects combined with the fact that "the entire hierarchy is a
nested data structure that is easy to reason about and modify at runtime
On Fri, 2013-06-07 at 13:25 +0200, Robert Ewald wrote:
> But merge-with and other functions don't work, even though I
> think it is not unreasonable to expect that.
What do you expect the results of these to be?
(merge-with + [1 2])
(merge-with + [1 2 3] [])
(merge-with + [] [1 2 3])
(merge-with
I think I get the difference now between a sequence, list, and a vector. Thanks
for the quick answers.
On Jun 20, 2013, at 5:14 PM, "John D. Hume" wrote:
> On Jun 20, 2013 3:11 PM, "Jason Gilman" wrote:
> >
> > (defn bar [my-list n]
> > (if (= n 0)
> > (peek my-list)
> > (bar (r
On Jun 20, 2013 3:11 PM, "Jason Gilman" wrote:
>
> (defn bar [my-list n]
> (if (= n 0)
> (peek my-list)
> (bar (rest my-list) (dec n
> (bar [1 2 3] 1)
>
It seems likely you want either first and rest* (to work from the front of
any seqable) or peek and pop (to work from the back
One thing to consider: try* is a compiler builtin form. Those are currently
not even namespaced. That might lead to confusion for readers.
2013/6/20 Max Gonzih
> I updated my macro to your solution, looks really simple and works like
> before. I don't know why I overcomplicated my original solu
Hi,
I think it's by design.
It only works with concrete data structure (list, vector, queue) types that
implement
clojure.lang.IPersistentStack
Las
2013/6/20 Jason Gilman
> Also, I really appreciate anyone who takes the time to answer. My company
> is currently evaluating Clojure. I'm try
Calling seq on vector returns a sequence which is no longer a vector. The
docstring is pretty specific about which types it's supposed to work on.
clojure.core/peek
([coll])
For a list or queue, same as first, for a vector, same as, but much
more efficient than, last. If the collection is empt
Also, I really appreciate anyone who takes the time to answer. My company
is currently evaluating Clojure. I'm trying to determine if this is
non-idiomatic use of the language or some other issue. Doing something like
this can cause the bug to occur without directly calling seq on a vector:
(de
Why does (peek (seq [1])) result in:
ClassCastException clojure.lang.PersistentVector$ChunkedSeq cannot be cast
to clojure.lang.IPersistentStack clojure.lang.RT.peek (RT.java:634)
Peek documentation "For a list or queue, same as first, for a vector, same
as, but much more efficient than, last.
More importantly than any of these things, he is hanging onto the head of a
very, very large sequence with (def lazytri (map triangle (range))). This
will lead to serious memory pressure, and perhaps eventually a slowdown as
this sequence takes up all the memory in his app and the GC strains to
On Jun 18, 6:22 am, Jonathon McKitrick wrote:
> So, the question then, is what would be the difference between a heroku
> scheduled command (which I currently am running, wakes up, does some work,
> etc) and a 'worker process' type? Does the latter need a job queue set up?
> Does it run constant
Hi,
Am Donnerstag, 20. Juni 2013 15:19:40 UTC+2 schrieb John Holland:
>
> (defn triangle [n] (reduce + (range n)))
> (def lazytri (lazy-seq (map triangle (range
>
>
Some quick idea: here is a major difference in your clojure and your java
implementation. You always recompute the whole sum f
On 20 June 2013 14:35, Phillip Lord wrote:
> Oh yeah, how sneaky. In one case, you get a class, in the other, you get
> a symbol. Backtick is doing quite a bit more than letting you unquote
> and splice.
You get a symbol in both cases, though with a different name:
(import java.awt.image.Buffere
OK, with a coding improvement
(defn factors-sqrt [n]
(filter #(= 0 (mod n %)) (range 1 (+ 1 (Math/sqrt n )
(defn num-of-factors [n] (* 2 (count (factors-sqrt n
it works for 499. (Idea being factors come in pairs, each factor >
sqrt(x) corresponds to one > sqrt(x))
Was it just runnin
I'm working on problems at projecteuler.net in Clojure.
There is a particular problem that my code doesn't seem to work for. The
problem is:
==
The sequence of triangle numbers is generated by adding the natural
numbers. So the 7th triangle number would be 1 +
On Thu, Jun 20, 2013 at 8:50 PM, Phillip Lord
wrote:
> Thanks for the explanation. I was confused.
Cheers, glad it helped.
Ambrose
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"Jim - FooBar();" writes:
> On 20/06/13 08:49, Phillip Lord wrote:
>> Well, that doesn't answer the question. The backtick is useful in
>> writing macros (although the situation this caused me grief, actually, I
>> wasn't). So is quote. But then I do not understand why the behaviour is
>> differen
Oh yeah, how sneaky. In one case, you get a class, in the other, you get
a symbol. Backtick is doing quite a bit more than letting you unquote
and splice.
Colin Fleming writes:
> Thank you for this, you just fixed a bug for me :-)
>
> I was trying to do some tricky type hinting with definline us
Ambrose Bonnaire-Sergeant writes:
> It's a good question.
>
> Syntax quote is designed for generating code/syntax that is deterministic
> and avoids accidental local name capture.
>
> 1. Automatic namespace qualification helps avoid accidental local name
> capture in macros.
>
> user=> `(let [a# 1
ClSymbol is a Java class. I don't get the replacement warning because I've
excluded that symbol explicitly in my ns declaration using :refer-clojure
:exclude.
I haven't done a 'lein clean' because I'm not using lein, but I have
rebuilt various times. However, sometimes it will work and sometimes i
On 20/06/13 08:49, Phillip Lord wrote:
Well, that doesn't answer the question. The backtick is useful in
writing macros (although the situation this caused me grief, actually, I
wasn't). So is quote. But then I do not understand why the behaviour is
different between the two.
I thought the ques
On 20/06/13 10:59, Colin Fleming wrote:
Because this tests for something different - that the element is an
instance of ClSymbol. It's not testing the same thing as the core
version. I qualify it (psi/symbol? in the examples above) to
distinguish it from the core one.
Basically, I'm trying to
Because this tests for something different - that the element is an
instance of ClSymbol. It's not testing the same thing as the core version.
I qualify it (psi/symbol? in the examples above) to distinguish it from the
core one.
Basically, I'm trying to use definline to allow me to have a more Clo
There is already a symbol? predicate in core. Why are you defining your
own? Does your problem disappear when you use the one from core?
What exactly are you trying to do? I use definline quite frequently and
have never encountered such problems...
Jim
On 20/06/13 10:35, Colin Fleming wrote:
Hi all,
I'm having a problem where a definline'd function is not working when used
as a predicate for filtering. It seems to work sporadically - occasionally
it works, occasionally it doesn't. I'm thinking it's probably a compile
problem since it seems to work or not work consistently for each com
Hi Phil,
It's a good question.
Syntax quote is designed for generating code/syntax that is deterministic
and avoids accidental local name capture.
1. Automatic namespace qualification helps avoid accidental local name
capture in macros.
user=> `(let [a# 1
b# a]
a#)
(cloj
Jim writes:
> On 19/06/13 09:46, Phillip Lord wrote:
>> With the ' paul is not namespace qualified, while with the ` paul is.
>>
>>
>> Turns out to be a bit of a pain, actually, although I have worked around
>> it. But mostly I am surprised. Is this expected?
>
> Yes, this is very much expected! :
On Saturday, June 15, 2013 4:37:06 AM UTC-7, Mikera wrote:
>
> On Friday, 14 June 2013 18:15:34 UTC+1, Jason Wolfe wrote:
>
>> Hey Mikera,
>>
>> I did look at core.matrix awhile ago, but I'll take another look.
>>
>> Right now, flop is just trying to make it easy to write *arbitrary*
>> array
I updated my macro to your solution, looks really simple and works like
before. I don't know why I overcomplicated my original solution so much :).
Thanks again!
On Thursday, June 20, 2013 8:47:37 AM UTC+3, Meikel Brandmeyer (kotarak)
wrote:
>
> Hi,
>
> Am Mittwoch, 19. Juni 2013 17:00:17 UTC+2
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