Re: clojureans in Boston and NYC

[Tamreen Khan]

The Clojure NYC meetup gets together about once a month:
http://www.meetup.com/Clojure-NYC/


On Mon, Mar 11, 2013 at 10:06 AM, Giacomo Cosenza
wrote:

> Hello everyone,
> on march 29th I'm moving from Milan (Italy) to Boston and I'm going to
> stay there for a month. During that month I'm pretty sure I'm going to
> visit NYC for few days. It would be an honor for me to have the opportunity
> to meet any clojurean living in Boston and NYC. There few italian
> clojureans and most of them live abroad and the only italian clojureans
> that I personally know are the ones working in my small sw company.
>
> If someone is interested to meet me, just let me know. I'll appreciate a
> lot.
>
> Thanks so much for your attention.
>
> Mimmo
>
>
>
>
>
>
>
>
>
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Re: A forum for Clojure...?

[Tamreen Khan]

True, but the gaming community itself is heavily forum-based, so it makes
sense that gaming frameworks and libraries will also have active forums.


On Tue, Mar 5, 2013 at 2:21 PM, BJG145  wrote:

> Hmm, I'm Googling to find a good example.
>
> Haskell forums...nope, rubbish.
> Python forums...nope.
>
> Maybe it's not a programmer thing. The gaming frameworks have nice forums
> - Unity for example. They're not all newbies.
>
> http://forum.unity3d.com/forum.php
>
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Re: A forum for Clojure...?

[Tamreen Khan]

It's a little different for language communities. More experienced
developers will tend to use mailing lists or IRC. Also, I think
stackoverflow is quickly become the go-to place for beginners to a language.

On Tue, Mar 5, 2013 at 2:14 PM, BJG145  wrote:

> I don't see it as an experience thing. There are a lot of highly skilled
> professionals on the Edugeek and Sound On Sound forums...
>
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Re: [GSoC Idea] cljs layer/dsl over express js

[Tamreen Khan]

But compojure isn't in cljs, so you have to use the jvm. A wrapper around
express would mean you could run it on node.


On Thu, Feb 14, 2013 at 5:35 PM, Josh Kamau  wrote:

> Clojure has compojure ... which is a sinatra like web framework  and
> you can create a new project using"lein new compojure"   and start
> creating your request handler functions from there ... Just like in
> express.  If you want a jade equivalent... you can use hiccup .
>
> Josh.
>
>
> On Fri, Feb 15, 2013 at 12:30 AM, Omer Iqbal wrote:
>
>> Just throwing ideas. Feel free to shoot it down if you folks think its
>> not worth it :).
>> Also, I'm a student, and would actually be participating in GSOC, so this
>> is more of a shoutout for possible mentors, if you guys think the project
>> makes sense.
>>
>> The Problem:
>> 1. cljs doesn't yet have a library/framework of its own to facilitate
>> serverside web dev over nodejs. (I might be wrong here, and please correct
>> me if I am).
>> 2. Expressjs(http://expressjs.com/) is an awesome sinatra inspired, very
>> popular, web app framework for node.
>> 3. Using express directly using js interop calls can get ugly
>> QED: It would make sense to have a cljs layer over express
>>
>> The Solution:
>> I haven't ironed this out fully, but it would probably be a good idea to
>> produce a compojure like framework, so its easier to adopt. Under the hood
>> you'll obviously have either interop calls, or cljs implementations for the
>> same functionality.
>>
>> Would love feedback on the idea! And whether can haz mentor?
>>
>> Cheers,
>> Omer
>> (@olenhad)
>>
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Re: Clojure - Python Style suggestion

[Tamreen Khan]

Again, I don't think it will help attract new users, at least not the way
we want. Parentheses are an important part of the language and it's not
something a beginner can just pick up later. If they're scared of
parentheses now, they'll be scared when they try to jump from this
paren-lite syntax to full Clojure. And it's for the same reasons that
Python doesn't have a 'simpler' version without significant whitespace.


On Mon, Feb 4, 2013 at 3:30 PM, Sergey Didenko wrote:

> My point is to introduce a second-class syntax to attract orthodox
> users. Definitely not migrating.
>
> The rules of transformation can be so simple that any useful library
> written by Clojure Python style adopters could be translated to the
> canonical style automatically with a few line program.
>
> > I can't see the community migrating to such a syntax, even if somebody
>
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Re: Clojure - Python Style suggestion

[Tamreen Khan]

Sergey's example code seems to have arguments to a function happen on the
same line while new function calls appear on new lines. So:

filter
  smaller xs

...would be the equivalent of filter(smaller(xs)).

Anyway, I agree that parens don't add any more clutter. Having to *always*
have all the arguments on the same line could lead to needlessly long
lines. I also don't see how syntax like this would make the transition to
full Clojure with all the parentheses any easier. Beginners would still shy
away from all the parens and never go beyond playing around with the
language.

Would Python ever have a "indent-lite" version that allowed beginners to
use braces instead of indentation? Of course not, because learning to read
and write code with significant whitespace is an important part of python.
If a beginner doesn't learn those things from the start they'll only
handicap themselves more later on. And the same goes with Clojure, it's
important to learn those parentheses from the beginning so you can lose
your fear of them earlier on.

Tamreen


On Mon, Feb 4, 2013 at 3:06 PM, Timothy Baldridge wrote:

> Parens actually don't complect, they have a very very clear meaning. They
> organize functions and arguments. Let's take one line from your example:
>
> filter smaller xs
>
> Sois that the python equivalent to which of these?
>
> filter(smaller(xs))
> filter(smaller, xs)
> filter(smaller(), xs())
> filter(smaller(xs()))
>
> I would also assert that Python complects formatting and semantic meaning
> of the code. I'm quite proficient at Python and even I hate that fact.
>
> Timothy
>
>
>
> On Mon, Feb 4, 2013 at 1:01 PM, Sergey Didenko 
> wrote:
>
>> Hi,
>>
>> For us as Clojure community it is easy to see how Clojure benefits
>> from being a Lisp. Homoiconity, extreme conciseness, esoteric look and
>> feel, etc.
>>
>> However it is hard to see from the inside how Clojure as ecosystem
>> (probably) suffer from being a Lisp. Please don't throw rotten eggs at
>> me, I mean only the part of Lisp that is ... parentheses.
>>
>> I remember a number of people that mention parentheses as obstacles to
>> the wider Clojure adoption, in the Clojure space - in the Clojure
>> related discussions, even on this mailing list IIRC.
>>
>> But the number of people thinking this way outside the Clojure groups
>> is even bigger! We probably don't notice it because got immune to this
>> famous argument "it has too many parentheses" early when diving into
>> Clojure.
>>
>> I suggest there are a big number of people that could gain interest in
>> clojure if we provide them with parentheses-lite Clojure syntax. For
>> example we can steal Python way of intending blocks.
>>
>> For example the following quicksort implementation
>>
>> (defn qsort [[pivot & xs]]
>>   (when pivot
>> (let [smaller #(< % pivot)]
>>   (lazy-cat (qsort (filter smaller xs))
>> [pivot]
>> (qsort (remove smaller xs))
>>
>> could be written as
>>
>> (set! python-style-op-op true)
>>
>> defn qsort [[pivot & xs]]
>>   when pivot
>> let [smaller #(< % pivot)]
>>   lazy-cat
>> qsort
>>   filter smaller xs
>> [pivot]
>> qsort
>>   remove smaller xs
>>
>> What do you think?
>>
>> Isn't is less complex?
>>
>>
>> P.S. Ok, I must confess, the mention of the C-Word in the last
>> sentence was just a desperate way to get Rich's attention.
>>
>> P.P.S. Actually I would also love to see Clojure community making
>> video clip "Clojure - Python Style" as a remix for "G... Style", but
>> this idea is probably way ahead of its time.
>>
>>
>> Regards, Sergey.
>>
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>
>
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> programs.”
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Re: Is there any reason to make different file extension (clj and cljs) for Clojure and ClojureScript?

[Tamreen Khan]

While Clojurescript aims to be close to Clojure, they're still
different languages, with entirely different compilers. Much of the
Clojure toolchain uses the extension to figure out how to compile a
given file. Otherwise, as far as I know there's no reasonable way to
tell apart Clojure code from Clojurescript code.

On Fri, Oct 19, 2012 at 9:24 AM, Mamun  wrote:
> Hi All,
>
> I've just started to learn Clojure and interested to see more ClojureScript.
> It is really nice stuff- data structure, function and code sharing. But Is
> there any reason to make different file extension (*.clj and *.cljs) for
> Clojure and ClojureScript?
>
> Regards,
> Mamun
>
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Re: *foo*

[Tamreen Khan]

Asterisks are valid characters for names, just like alphanumeric
characters, dashes, question marks, etc.

According to Practical Clojure
(http://books.google.com/books?id=4QacPa1vwMUC&pg=PA24&lpg=PA24&dq=clojure+star+character&source=bl&ots=2yDJkpf6ni&sig=2bV8rr5qpn-ev5Y50MW9XpE5fKA&hl=en&sa=X&ei=w2V0UM3cFq6H0QGx6YHwBg&ved=0CEsQ6AEwBQ#v=onepage&q=clojure%20star%20character&f=false):

   "If a symbol is a constant or a global program setting, it often
begins and ends with the star character (*)."

On Tue, Oct 9, 2012 at 1:55 PM, Grant Rettke  wrote:
> On Tue, Oct 9, 2012 at 12:54 PM, Brian Craft  wrote:
>> I know I saw an explanation of this on some obscure page, but I can't find
>> it now. What's up with the symbols with stars at front & end?
>
> http://mumble.net/~campbell/scheme/style.txt
>
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Re: "strange" pattern to implement comp, juxt and partial

[Tamreen Khan]

My guess is that it's useful in the core functions which are more
heavily used. Otherwise you're getting into premature optimization if
you use it in any of your own functions without profiling it first.

On Tue, Oct 2, 2012 at 4:18 PM, Balint Erdi  wrote:
> Makes sense but why don't we have it in all possible places then?
>
> Thank you.
>
>
> On Tuesday, October 2, 2012 9:55:42 PM UTC+2, Herwig Hochleitner wrote:
>>
>> That is because dispatch on argument count is fast, while apply is slow.
>> Especially so since it might have to create an intermediate seq.
>> It's a performance optimization.
>>
>> kind regards
>
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Re: how do we go about promoting new clojure libraries?

[Tamreen Khan]

I think the consensus is that an electronic way to send the CA is just
the right amount of effort required. You stil have to take the time to
fill out a legally binding agreement but it also doesn't rule out
those for whom snail mail is just too unpractical because they live
outside the US or Europe, for example

On Wed, Sep 26, 2012 at 3:49 PM, Aaron Cohen  wrote:
> On Wed, Sep 26, 2012 at 3:40 PM, Michael Klishin
>  wrote:
>> 2012/9/26 Stuart Sierra 
>>>
>>> http://dev.clojure.org/display/community/Libraries is unorganized and out
>>> of date - volunteers welcome.
>>
>>
>> Stuart,
>>
>> No, that's not how it works. You *first* make contribution process easy,
>> *then* ask people to volunteer.
>>
>> Not the other way around, no.
>> --
>
> No, only if you want an unfiltered stream of absolutely anyone to
> contribute is that true. If you're ok with restricting volunteers to
> the subset who are actually willing show a little effort, making the
> process slightly cumbersome might even be a net benefit.
>
> --Aaron
>
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Re: Why IPersistentList doesn't extend ISeq?

[Tamreen Khan]

Sorry, I meant IPersistentList and PersistentList in the first sentence of
my previous email.

On Sun, Sep 2, 2012 at 11:00 PM, Tamreen Khan  wrote:

> First, IPersistentSeq is the interface, PersistentSeq is the actual class.
>
> If you look at it a little more closely, PersistentList extends ASeq,
> which is an abstract class. ASeq implements the ISeq interface. So
> PersistentList does implement ISeq through its parent class.
>
>
> https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/PersistentList.java#L16
>  <-
> PersistentList extending ASeq
>
> https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/ASeq.java#L16
>  <-
> ASeq implementing ISeq
>
>
> On Fri, Aug 31, 2012 at 12:58 PM, Andrei Zhlobich wrote:
>
>> Why IPersistentList doesn't extend ISeq?
>>
>> Clojure docs say:
>>  >> Lists are collections. They implement the ISeq interface directly
>> (except for the empty list, which is not a valid seq)
>>
>> At this moment EmptyList implements ISeq, but PersistentList doesn't. It
>> seems very strange for me.
>> Also PersistentQueue implements IPersistentList, but semantically it is
>> not a list.
>>
>> I think we can do 2 changes in hierarchy:
>> 1) extend IPersistentList from ISeq;
>> 2) extend PersistentQueue directly from IPersistentStack instead of
>> IPersistentList.
>>
>> Is it possible?
>>
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Re: Why IPersistentList doesn't extend ISeq?

[Tamreen Khan]

First, IPersistentSeq is the interface, PersistentSeq is the actual class.

If you look at it a little more closely, PersistentList extends ASeq, which
is an abstract class. ASeq implements the ISeq interface. So PersistentList
does implement ISeq through its parent class.

https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/PersistentList.java#L16
<-
PersistentList extending ASeq
https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/ASeq.java#L16
<-
ASeq implementing ISeq


On Fri, Aug 31, 2012 at 12:58 PM, Andrei Zhlobich wrote:

> Why IPersistentList doesn't extend ISeq?
>
> Clojure docs say:
>  >> Lists are collections. They implement the ISeq interface directly
> (except for the empty list, which is not a valid seq)
>
> At this moment EmptyList implements ISeq, but PersistentList doesn't. It
> seems very strange for me.
> Also PersistentQueue implements IPersistentList, but semantically it is
> not a list.
>
> I think we can do 2 changes in hierarchy:
> 1) extend IPersistentList from ISeq;
> 2) extend PersistentQueue directly from IPersistentStack instead of
> IPersistentList.
>
> Is it possible?
>
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Re: Clojure Practice?

[Tamreen Khan]

http://www.4clojure.com/

Pretty much exactly what you need. It has a series of problems from very
easy to more advanced ones that cover a wide range of what programming in
clojure involves, and you can type in and run the code right on the site.

On Sat, Sep 1, 2012 at 4:56 PM, JvJ  wrote:

> I've been interested in Clojure for some time, but I haven't really needed
> to code much recently (in any language).  Does anyone have any ideas on
> good ways to practice Clojure (like websites with practice problems or
> whatever)?
>
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Re: anonymous functions with names

[Tamreen Khan]

The name given an anonymous function can only be used within the scope of
that function.

This will work:

(fn my-func1 [x] (my-func x)) ; Leads to infinite recursion, of course

This won't work because my-func1 is called outside of the function's
lexical scope:

(fn my-func1 [x] x)
(my-func1 100)

However, functions defined with defn use a global var, so they're not
limited to any particular lexical scope.

On Fri, Aug 31, 2012 at 11:52 AM, Erlis Vidal  wrote:

> Hi guys,
>
> I've been reading but I'm still confused about the difference between an
> anonymous function with name vs a defn function
>
> (fn my-func1[x] x)
>
> (defn my-func2[x] x)
>
> Thanks,
> Erlis
>
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Re: Pattern of Succinctness

[Tamreen Khan]

Is the last one considered generally more readable? I think the following
is clearer while still not having as much noise as the first filter example:

(filter (partial not nil?) coll)

On Sun, Aug 12, 2012 at 1:35 PM, Takahiro Hozumi wrote:

> Hi,
> I would like to know common technics that make code succinct.
>
> For example:
> (or (:b {:a 1}) 0)
> (:b {:a 1} 0)
>
> (if-not x 1 2)
> (if x 2 1)
>
> (filter #(not (nil? %)) coll)
> (filter identity coll) ;; nearly equal
>
> Please let me know any tips you found.
>
> Cheers,
> Takahiro.
>
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Re: Why Clojure map literal creates an instance of array map?

[Tamreen Khan]

It's not dependent on whether it's a literal but on the size of the map, 8
key-value pairs is the threshold.

This results in a PersistentHashMap
(class {1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8 9 9})  =>
clojure.lang.PersistentHashMap

This gets you a PersistentArrayMap
(class {1 1 2 2 3 3 4 4 5 5 6 6 7 7 8 8})  => clojure.lang.PersistentHashMap

You can see where this happens in the source here:
https://github.com/clojure/clojure/blob/master/src/jvm/clojure/lang/PersistentArrayMap.java#L115

HASHTABLE_THRESHOLD is a constant set to 16, 8 keys and 8 values. So when
you assoc onto an arraymap with 8 key-value pairs it returns a hashmap.

The reason for this, as far as I understand it, is that with small hashmaps
it's more efficient to do simple copy-on-write. In other words when you
assoc onto it, it copies the entire map, adds the new key-value pair to the
copy, and then returns the copy. With larger hashmaps, it becomes more
useful to do use a more complicated tree structure which uses structural
sharing so that assoc doesn't copy the entire map. Copying a small 5
element map isn't a big deal, but copying one with several thousand
elements is.

On Fri, Aug 10, 2012 at 5:43 PM, Hussein B.  wrote:

> Hi,
> Why Clojure map literal creates an instance of array map but not hash map?
> What are the advantages of array map over hash map?
> Thanks.
>
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Re: CSV Parser

[Tamreen Khan]

The usual filename extension for Clojure files is .clj. Renaming it to that
will also get you syntax highlighting on the gist.

On Thu, Jul 26, 2012 at 4:10 PM, Christian Sperandio <
christian.speran...@gmail.com> wrote:

> Below the link :) https://gist.github.com/3184210
> Thanks
>
>
> 2012/7/26 Jeremy Heiler :
> > On Wed, Jul 25, 2012 at 7:31 PM, Christian Sperandio
> >  wrote:
> >> hi,
> >>
> >> I started learning Clojure programming these last days. For my
> training, I
> >> developped a CSV parser.
> >> I propose to everyone and I'd like to hava advice about my development
> (is
> >> it in the FP logic? Do I use the good practices ?)
> >>
> >> My attachment contains the source file and a test file. I simulate a
> file
> >> content by using vector. I used the Clojure 1.3 for my dev.
> >
> > You would probably be better off if you put your project on GitHub (or
> > as a Gist) so we can view it online.
> >
> >>
> >> Thanks for your advice :)
> >>
> >> Chris
> >
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Re: Why cannot "last" be fast on vector?

[Tamreen Khan]

Here's a somewhat old but still generally useful article on how Clojure
vectors are implemented:
http://blog.higher-order.net/2009/02/01/understanding-clojures-persistentvector-implementation/


Vectors are optimized for random access, whereas lists are optimized for
going through from the beginning to the end, which is exactly what the last
function does.

On Thu, Jun 28, 2012 at 7:36 PM, David Nolen  wrote:

> On Thu, Jun 28, 2012 at 7:32 PM, Warren Lynn  wrote:
>
>> This is an off-shoot subject from my last post "General subsequence
>> function".
>>
>> I found people had similar questions before (one year ago):
>>
>> http://groups.google.com/group/clojure/browse_thread/thread/712711f049507c63/aea7cf438aa22922
>>
>> As of Clojure 1.4, seems nothing changed, as "source" show here:
>>
>> user> (source last)
>> (def
>>  ^{:arglists '([coll])
>>:doc "Return the last item in coll, in linear time"
>>:added "1.0"
>>:static true}
>>  last (fn ^:static last [s]
>> (if (next s)
>>   (recur (next s))
>>   (first s
>>
>> Any reason for that? Thanks.
>
>
> Don't hold your breath. Assume that the language was designed after much
> consideration. last is a sequence operation, not a collection operation. If
> the distinction doesn't make sense, I suggest you explore the design
> decision by writing some non-trivial Clojure code so you can arrive at your
> own satisfying answer why this was done. Otherwise you'll just listen to
> people repeat the same answer without hearing what is being said.
>
> David
>
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Re: what is "js/" in clojurescript?

[Tamreen Khan]

A quick explanation is that functions/other javascript objects that
otherwise exist in the global namespace (ie. document, console, window) are
accessed through the js/ in Clojurescript. This is a JS-specific thing and
therefore you don't find js/ in regular Clojure.

However, doing the form (MyClass/MyStaticMethod arg1 arg2 ...) *does* exist
in Clojure. It's a way of calling static Java methods or accessing static
fields. See  http://clojure.org/java_interop for more info.

On Thu, May 3, 2012 at 12:12 AM, Rob  wrote:

> Hi,
>
> Syntax like this doesn't work in normal Clojure, right?
>
> js/document.body.style
>
> It just did in a ClojureScript repl.  Is there something magic about "js/"
> ?  What is it?
>
> thanks,
> Rob
>
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Re: Light Table - a new IDE concept

[Tamreen Khan]

Nope, the source hasn't been released yet. I think Chris is still trying to
figure out what to do with it.

2012/4/13 D.Bushenko 

> This is really interesting. Is there a sourcecode for the light table ? I
> couldn't find it...
>
> пятница, 13 апреля 2012 г., 21:34:54 UTC+3 пользователь looselytyped
> написал:
>
>> This is an awesome implementation of Brett Victors "Inventing On
>> Principle" [http://vimeo.com/36579366] using Clojure and Noir by Chris
>> Granger (who also wrote Noir).
>>
>> Figured I would share it with the group.
>>
>> http://www.chris-granger.com/**2012/04/12/light-table---a-**
>> new-ide-concept/
>>
>> Raju
>
>
> пятница, 13 апреля 2012 г., 21:34:54 UTC+3 пользователь looselytyped
> написал:
>
>> This is an awesome implementation of Brett Victors "Inventing On
>> Principle" [http://vimeo.com/36579366] using Clojure and Noir by Chris
>> Granger (who also wrote Noir).
>>
>> Figured I would share it with the group.
>>
>> http://www.chris-granger.com/**2012/04/12/light-table---a-**
>> new-ide-concept/
>>
>> Raju
>
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Re: Alternative download site for Clojure 1.3?

[Tamreen Khan]

And like Sean mentioned, using Leiningen *really* helps. Especially when
you have Emacs with clojure set up as well.

On Fri, Mar 30, 2012 at 8:17 AM, Murphy McMahon  wrote:

> Learning Clojure is the fun part. Setup and maintenance of the tools is a
> little less fun, IMO. But where there's a will (and a connection to
> freenode), there's a way.
>  On Mar 30, 2012 9:09 AM, "Chris Webster"  wrote:
>
>> Thanks for the advice, guys.
>>
>> I think it must just have been some temporary problem on the site, as I
>> finally got it to download late last night.  Now all I have to do is learn
>> Clojure, eh?
>>
>>
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Re: Where to post job ad

[Tamreen Khan]

Yep, just make sure to mention that it's an offer and the location in the
subject to make it easy to spot.

On Fri, Mar 30, 2012 at 11:39 AM, David Powell wrote:

>
>
> On Fri, Mar 30, 2012 at 1:35 PM, David Jagoe  wrote:
>
>> G'day everyone
>>
>> I am increasingly relying on clojure and plan to use clojureclr and
>> clojurescript in production too. I will soon need to hire a clojure
>> developer and was hoping that someone could suggest a good place to post a
>> job ad. I've never seen a job posted here but I would like to reach the
>> community.
>>
>
> They've been posted here before.  I'm sure nobody will mind.
>
> --
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Re: -> and ->>

[Tamreen Khan]

-> - http://clojuredocs.org/clojure_core/clojure.core/-%3E
->> http://clojuredocs.org/clojure_core/clojure.core/-%3E%3E

On Wed, Feb 8, 2012 at 11:16 AM, Simon Holgate  wrote:
> Could anyone point me to a description of "->" and "->>", please?
>
> I've seen a few references to them (e.g. git://gist.github.com/1761143.git)
> but nothing in "Programming Clojure". Google doesn't seem to like
> searching for such strings.
>
> Thanks.
>
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Re: Opposite function to cons, but in terms of construction, not destruction.

[Tamreen Khan]

Conj (http://clojuredocs.org/clojure_core/clojure.core/conj) does what
you need for vectors. It's behavior depends on the type of collection
passed, so if you did:

(conj '(1 2 3) 4) you would end up with '(4 1 2 3).

For vectors it appends to the end of the list, for lists the beginning.

On Sat, Dec 10, 2011 at 6:13 AM, Michael Jaaka
 wrote:
> Is there something like:
>
> (defn snoc[ col item ]
>        (lazy-seq
>                (if (seq col)
>                        (let[ [f &  r] col ]
>                                (if (seq r)
>                                        (cons f (snoc r item))
>                                        (cons f [item])))
>                        [item])))
>
> already here?
>
>
> (snoc (snoc (snoc [ 1 2 3] 4) 6) 7)
>
> gives:
>
> (1 2 3 4 5 6 7)
>
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Re: I/O

[Tamreen Khan]

For that you'll have to look into the clj-http library:
https://github.com/mmcgrana/clj-http

>From the readme: (client/post "http://site.com/resources"; {:body "string"})

On Thu, Aug 25, 2011 at 2:00 PM, Terje Dahl  wrote:

> Great question.  And great answer.
> Seriously!  I did not know it could be that easy.
> So an http GET just needs 1 lines!:
>
>(slurp (reader "http://google.com";))
>
> (Don't forget: (use 'clojure.java.io) )
>
>
> Is there an equally easy way to do an http POST?
> And also a multi-part (including one or more files in the POST)?
>
>
>
> On 25 Aug, 18:24, Mats Rauhala  wrote:
> > I too stumbled upon this a while ago. I might even say that on some
> > level it's so simple that there is not much documentation about it, and
> > at some point it gets 'complex' enough that you should know about java
> > enough.
> >
> > The simplest way is to slurp or spit. slurp reads a file into a string,
> > and spit writes a string into a file.
> >
> > Then there is the with-open macro(?) which opens connections and closes
> > them when one. The reader and writer opens a java Reader and Writer
> > classes respectively. (They're interfaces, but those functions try to
> > figure out what kind of handle you're trying to open). Also the
> > output-stream and input-stream handle it a bit.
> >
> > (with-open [r (reader "http://www.reddit.com";)]
> >  (.read r))
> >
> > And to finish this off with a shameless plug; I wrote a blog post about
> > downloading a random wallpaper from reddit, which handles reading http
> > content, parsing json and reading/writing binary files.
> >
> > http://users.utu.fi/machra/posts/2011-08-24-2-reddit-clojure.html
> >
> > --
> > Mats Rauhala
> > MasseR
> >
> >  application_pgp-signature_part
> > < 1 KVisLast ned
>
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Re: ClojureScript Memory Requirements

[Tamreen Khan]

I've removed the first two flags since I work on a 32 bit machine and
haven't run into any problems either. I'm guessing the the extra memory
simply helps with compilation times.

On Tue, Jul 26, 2011 at 9:49 AM, Timothy Baldridge wrote:

> So I've hit an issue with the ClojureScript compiler memory
> requirements several times now. The command line arguments in use for
> both the compiler and the repl are thus:
>
> -Xmx2G -Xms2G -Xmn256m
>
> So basically this requires 2GB of memory right off the bat to even run
> the compiler. Now I'm not interested in a discussion of the memory
> usage of Clojure, we all know it's a bit more memory intensive than C
> or plain Java, and that's not my point. My question is, is this 2GB
> really needed? On Windows boxes, and perhaps some Linux Machines, this
> is not 2GB of virtual memory, but actually 2GB of read RAM. So my main
> workstation, which has 4GB of ram will fail to run this compiler if I
> have too many programs open. So I thought I'd try this in a VMbut
> my VM needs to have at least 2GB of RAM?
>
> As a test, I removed these options from the command line scripts and a
> simple "hello world" compiled fine...so I'm not sure what the issue
> is.
>
> Any thoughts on all this?
>
> Thanks,
>
> Timothy
>
> --
> “One of the main causes of the fall of the Roman Empire was
> that–lacking zero–they had no way to indicate successful termination
> of their C programs.”
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Re: ClojureScript on Windows

[Tamreen Khan]

I've gotten the basics working. Haven't had the time to write up a full blog
post, though. Basically I used Cygwin so that I could run the bootstrap
script. In any of the shell scripts where it sets a classpath you'll have to
change the colons to semicolons.

On Mon, Jul 25, 2011 at 10:59 AM, Timothy Baldridge wrote:

> Is there a documented way to get ClojureScript working on Windows?
> While I'm familiar with Linux, and use it in several server
> environments, all my development is on Windows, so I don't really have
> access to a Linux box for development.
>
> Timothy
>
> --
> “One of the main causes of the fall of the Roman Empire was
> that–lacking zero–they had no way to indicate successful termination
> of their C programs.”
> (Robert Firth)
>
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Re: Can't find clojure.main in clojurescript's script/repl on Windows

[Tamreen Khan]

Changing colons to semicolons did it! I guess since the classpath is a
string that's passed to Java it still treats it like it would any path on
Windows, even though I'm using it through Cygwin.

Thanks again!

On Thu, Jul 21, 2011 at 6:49 PM, Brenton  wrote:

> That clojure.jar file is clojure 1.3.
>
> Something is wrong with the classpath.
>
> Here are a couple of things to try:
>
> - when using a batch file the classpath must be delimited with
> semicolons instead of colons
> - try replacing lib/* with an explicit list everything that is in lib
> - something like lib/clojure.jar;lib/goog.jar;lib/compiler.jar
>
> Just some thoughts
>
> On Jul 21, 5:50 pm, Tamreen Khan  wrote:
> > Hmm, I have clojure.jar, but not clojure-1.3.jar in clojurescript/lib
> >
> >
> >
> >
> >
> >
> >
> > On Thu, Jul 21, 2011 at 5:49 PM, Tamreen Khan 
> wrote:
> > > Yes. It worked fine.
> >
> > > On Thu, Jul 21, 2011 at 5:48 PM, Devin Walters 
> wrote:
> >
> > >>  Did you run script/bootstrap?
> >
> > >> You need a clojure-1.3 jar in your clojurescript/lib directory.
> >
> > >> On Thursday, July 21, 2011 at 4:45 PM, Tamreen Khan wrote:
> > >> > Hi everyone, I'm trying to get the repl for Clojurescript to start
> under
> > >> Windows but keep running into the following error:
> >
> > >> > Exception in thread "main" java.lang.NoClassDefFoundError:
> clojure/main
> > >> > Caused by: java.lang.ClassNotFoundException: clojure.main
> > >> >  at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
> > >> >  at java.security.AccessController.doPrivileged(Native Method)
> > >> >  at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
> > >> >  at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> > >> >  at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> > >> >  at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> > >> > Could not find the main class: clojure.main. Program will exit.
> >
> > >> > I've tried both running the script under cygwin and putting the
> contents
> > >> into a batch file and running it with cmd.exe (it shouldn't be a
> problem
> > >> since script/repl just contains one command which starts the java
> runtime
> > >> with a few options). I've even tried changing the forward slashes in
> the
> > >> command to backslashes.
> >
> > >> > Also, I'm running these commands from the clojurescript root
> directory.
> > >> Even though it probably won't affect it I've set CLOJURESCRIPT_HOME as
> well.
> > >> Any ideas?
> >
> > >> >  --
> > >> >  You received this message because you are subscribed to the Google
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Re: Can't find clojure.main in clojurescript's script/repl on Windows

[Tamreen Khan]

Hmm, I have clojure.jar, but not clojure-1.3.jar in clojurescript/lib

On Thu, Jul 21, 2011 at 5:49 PM, Tamreen Khan  wrote:

> Yes. It worked fine.
>
>
> On Thu, Jul 21, 2011 at 5:48 PM, Devin Walters  wrote:
>
>>  Did you run script/bootstrap?
>>
>> You need a clojure-1.3 jar in your clojurescript/lib directory.
>>
>> On Thursday, July 21, 2011 at 4:45 PM, Tamreen Khan wrote:
>> > Hi everyone, I'm trying to get the repl for Clojurescript to start under
>> Windows but keep running into the following error:
>> >
>> > Exception in thread "main" java.lang.NoClassDefFoundError: clojure/main
>> > Caused by: java.lang.ClassNotFoundException: clojure.main
>> >  at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
>> >  at java.security.AccessController.doPrivileged(Native Method)
>> >  at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
>> >  at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
>> >  at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
>> >  at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
>> > Could not find the main class: clojure.main. Program will exit.
>> >
>> >
>> > I've tried both running the script under cygwin and putting the contents
>> into a batch file and running it with cmd.exe (it shouldn't be a problem
>> since script/repl just contains one command which starts the java runtime
>> with a few options). I've even tried changing the forward slashes in the
>> command to backslashes.
>> >
>> > Also, I'm running these commands from the clojurescript root directory.
>> Even though it probably won't affect it I've set CLOJURESCRIPT_HOME as well.
>> Any ideas?
>> >
>> >  --
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>
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Re: Can't find clojure.main in clojurescript's script/repl on Windows

[Tamreen Khan]

Yes. It worked fine.

On Thu, Jul 21, 2011 at 5:48 PM, Devin Walters  wrote:

>  Did you run script/bootstrap?
>
> You need a clojure-1.3 jar in your clojurescript/lib directory.
>
> On Thursday, July 21, 2011 at 4:45 PM, Tamreen Khan wrote:
> > Hi everyone, I'm trying to get the repl for Clojurescript to start under
> Windows but keep running into the following error:
> >
> > Exception in thread "main" java.lang.NoClassDefFoundError: clojure/main
> > Caused by: java.lang.ClassNotFoundException: clojure.main
> >  at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
> >  at java.security.AccessController.doPrivileged(Native Method)
> >  at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
> >  at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> >  at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
> >  at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
> > Could not find the main class: clojure.main. Program will exit.
> >
> >
> > I've tried both running the script under cygwin and putting the contents
> into a batch file and running it with cmd.exe (it shouldn't be a problem
> since script/repl just contains one command which starts the java runtime
> with a few options). I've even tried changing the forward slashes in the
> command to backslashes.
> >
> > Also, I'm running these commands from the clojurescript root directory.
> Even though it probably won't affect it I've set CLOJURESCRIPT_HOME as well.
> Any ideas?
> >
> >  --
> >  You received this message because you are subscribed to the Google
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> clojure@googlegroups.com)
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Can't find clojure.main in clojurescript's script/repl on Windows

[Tamreen Khan]

Hi everyone, I'm trying to get the repl for Clojurescript to start under
Windows but keep running into the following error:

Exception in thread "main" java.lang.NoClassDefFoundError: clojure/main
Caused by: java.lang.ClassNotFoundException: clojure.main
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:247)
Could not find the main class: clojure.main.  Program will exit.

I've tried both running the script under cygwin and putting the contents
into a batch file and running it with cmd.exe (it shouldn't be a problem
since script/repl just contains one command which starts the java runtime
with a few options). I've even tried changing the forward slashes in the
command to backslashes.

Also, I'm running these commands from the clojurescript root directory. Even
though it probably won't affect it I've set CLOJURESCRIPT_HOME as well. Any
ideas?

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Re: principle of least surprise

[Tamreen Khan]

It's because functions such as reduce, map, reverse, etc. only work on
sequences, so they have to call seq on that argument. Strings just
happen to be seq-able but calling seq on one returns a list of
characters, so the result is one too. Reverse always returns a
sequence and strings aren't technically sequences, so that's why it
doesn't convert the characters back into a string.

On Wednesday, July 20, 2011, Basi Lambanog  wrote:
> Hello,
> Any reason for the change in type after some operations, for example:
>
> user=>
> (type (reverse "abc"))
> clojure.lang.PersistentList
>
> user=>
> (type "abc")
> java.lang.String
>
> Since reverse operates on a string, shouldn't the result be a string
> as well? There's a few more of these type re-casting after an
> operation.
>
> Tuba
>
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Re: clooj, a lightweight IDE for clojure

[Tamreen Khan]

It's a little confusing to see what's normally the text for the prompt,
"user=>", be in the window that shows the result. Why can't both the prompt
and the results be shown in the same area?

On Mon, Jul 18, 2011 at 8:32 AM, Adam Burry  wrote:

> > - I just created a new project and I get a user prompt in the REPL pane
> but I can't type anything into that... so I can't actually try it... I click
> in there but I don't get a cursor there, and typing does nothing. In case it
> matters I'm running Mac OS 10.6.8 and java -version says:
>
> Re-read the OP. The right hand column has two parts: the top part
> shows REPL evaluation, the bottom part is your REPL input window.
>
> Adam
>
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Re: Repeating a vector n times

[Tamreen Khan]

Damn, Meikel's solution is better, I was thinking:

(apply concat (repeat n xs))

On Wed, Jul 13, 2011 at 10:54 AM, Bhinderwala, Shoeb <
sabhinderw...@wellington.com> wrote:

> **
>
> I have to write a function that will take a vector as input, repeat the
> elements multiple times and return back a single vector of the repeated
> items. I came up with the following but am wondering if there is a better
> or simpler way to write this:
>
> (def xs ["a" "b" "c"])
>
> (defn repeat-vec-n
>
>   [xs n]
>
>   (vec
>
> (reduce concat []
>
>   (take n (repeat xs)
>
> OUTPUT:
>
> user=> xs
>
> ["a" "b" "c"]
>
> user=> (repeat-vec-n xs 3)
>
> ["a" "b" "c" "a" "b" "c" "a" "b" "c"]
>
> ***-- Shoeb*
>
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Re: Results from 2011 State of Clojure survey

[Tamreen Khan]

What does something being shiny and new have to do with how good its
libraries, community, platforms, and support are? Heck, I'd say something
being new would detract from it library-wise. Sergey's point was that when
someone begins a new project they have the options of all those languages;
Clojure isn't just competing with new and shiny things.

On Tue, Jul 12, 2011 at 6:23 PM, Ken Wesson  wrote:

> On Tue, Jul 12, 2011 at 8:55 AM, Sergey Didenko
>  wrote:
> > You know that from inside. A Clojure "outsider" can have a completely
> other
> > point of view.
> >
> > He can choose between Python
>
> Not new
>
> > server side Javascript
>
> Not new
>
> > new C#
>
> Despite what you just said, not new
>
> > Go
>
> Haven't heard of it, so probably not shiny enough
>
> > Scala, F#
>
> Mentioned those
>
> > Haskell
>
> Not new
>
> > Erlang
>
> Not new
>
> > haXe
>
> Haven't heard of it, so probably not shiny enough
>
> > Clojure.
>
> So far, looks like the "shiny and new" category is Clojure, Scala, F#,
> and maybe one or both of the Go and haXe you mentioned. The rest
> definitely aren't particularly new.
>
> > Besides the languages itself, the "outsider" wants to evaluate libraries,
> > community, platforms, support, etc.
>
> That puts Clojure and Scala ahead of F# and the three of them ahead of
> nearly everything else.
>
> --
> Protege: What is this seething mass of parentheses?!
> Master: Your father's Lisp REPL. This is the language of a true
> hacker. Not as clumsy or random as C++; a language for a more
> civilized age.
>
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Re: monads > macros

[Tamreen Khan]

Are monads all that special? My understanding is that even in Haskell
its wise to not use monads all that much, since it starts to make the
code look a little too imperative if not wielded correctly. They're
not really the meat of haskell/fp. Macros on the other hand are an
important part of lisp, although their overuse is also discouraged :)

On Tuesday, July 12, 2011, James Keats  wrote:
>
> I'm mildly concerned about macros being seen as the "secret weapon" of
> clojure(/lisp).
>
> In their place, i wish monads would get a wider attention and embrace.
>
> Discuss? :-)
>
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Re: Clojure Koans and others interactive exercises to learn clojure?

[Tamreen Khan]

http://4clojure.com/ comes to mind, it has the same koan-style but what
looks like a lot more problems and you can run the code on the site itself.

On Sun, Jul 3, 2011 at 11:52 PM, Antonio Recio  wrote:

> Clojure koans  is
> awesome to learn clojure. Do you know other projects with exercises to learn
> clojure?
>
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Re: Cons vs List vs. ISeqs

[Tamreen Khan]

This stackoverflow page seems to have some info that might help:
http://stackoverflow.com/questions/3008411/clojure-seq-cons-vs-list-conj

Source for Cons:
https://github.com/hiredman/clojure/blob/master/src/jvm/clojure/lang/Cons.java
Source for PersistentList:
https://github.com/hiredman/clojure/blob/master/src/jvm/clojure/lang/PersistentList.java

>From looking at the source it looks like one major difference between Cons
and PersistentList is that Cons can have anything that implements ISeq for
_rest while PersistentList must have another PersistentList.

On Fri, Jun 24, 2011 at 7:35 PM, Tim Robinson wrote:

> I'm under the impression that traditional lisps have a greater
> distinction between a cons operation vs. a list operation.
> Specifically I had believed that consing was a more efficient and
> better performing operation than using list.
>
> Is this true? and if so, given both the Cons and Lists are actually
> both just seqs in Clojure, does the above statement still hold true in
> the Clojure world?
>
> Thanks
> Tim
>
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