Re: How did you learn Clojure?
On Mar 20, 2014, at 6:08 PM, Marcus Blankenship mar...@creoagency.com wrote: So I'm curious: how did you learn Clojure well enough to be proficient with it, or how are you working on learning it? Initial dabbling: The Joy of Clojure and a REPL. Caveat: it's not really an introductory Clojure book but I had past FP experience so I felt I could jump in. Initial serious learning: Attended Amit Rathore's Clojure Bootcamp - one day course for about $300 (if I remember correctly?). Follow-on: 4clojure.com, worked through Clojure in Action as well. Then I picked a handful of small-ish problems we'd already solved at work in other languages and re-coded them in Clojure. Since then it's been a steady stream of tackling increasingly larger problems at work, over a period of about three years. Anyone else facing the focus + fear dilemma? There's a lot less fear if you're used to learning new languages. I try to pick up a new language every year or two: Groovy in 2008/2009, Scala in 2009/2010, Clojure in 2010/2011 (and onward). Dabbled in Ruby, Python, Haskell since then but nothing serious. Very interested in Elm right now. As for focus, yes, you really do need a project. Either pick things you've done before in other languages, or figure out something that would scratch an itch (a small web app, perhaps?) and tackle that. Sean Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) signature.asc Description: Message signed with OpenPGP using GPGMail
Re: How did you learn Clojure?
Cool, thanks to all who've replied thus far. Question: is there any value in traditional lisp / scheme texts, like SICP, or Little Schemer (etc) or other books like that? I've spent quite a bit of time with them, imagining they would pay off, but I'm not sure that's a normal route to Clojure proficiency. Sent from my iPhone On Mar 20, 2014, at 11:12 PM, Sean Corfield s...@corfield.org wrote: On Mar 20, 2014, at 6:08 PM, Marcus Blankenship mar...@creoagency.com wrote: So I'm curious: how did you learn Clojure well enough to be proficient with it, or how are you working on learning it? Initial dabbling: The Joy of Clojure and a REPL. Caveat: it's not really an introductory Clojure book but I had past FP experience so I felt I could jump in. Initial serious learning: Attended Amit Rathore's Clojure Bootcamp - one day course for about $300 (if I remember correctly?). Follow-on: 4clojure.com, worked through Clojure in Action as well. Then I picked a handful of small-ish problems we'd already solved at work in other languages and re-coded them in Clojure. Since then it's been a steady stream of tackling increasingly larger problems at work, over a period of about three years. Anyone else facing the focus + fear dilemma? There's a lot less fear if you're used to learning new languages. I try to pick up a new language every year or two: Groovy in 2008/2009, Scala in 2009/2010, Clojure in 2010/2011 (and onward). Dabbled in Ruby, Python, Haskell since then but nothing serious. Very interested in Elm right now. As for focus, yes, you really do need a project. Either pick things you've done before in other languages, or figure out something that would scratch an itch (a small web app, perhaps?) and tackle that. Sean Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: How did you learn Clojure?
Thanks, I'll check it out! Sent from my iPhone On Mar 20, 2014, at 10:54 PM, Devin Walters dev...@gmail.com wrote: Shameless self-promotion: http://GetClojure.com is something I wrote to hopefully help people learn Clojure. One of the primary methods I used for learning Clojure was to do problems, like the ones Alex mentioned, read source, and ask questions in irc. The last one is important IMO and it's the reason why I wanted to make something like GetClojure. The expressions you search for are all taken from the irc channel and run through a sandbox so you can see what the value and output is. This lets you investigate interesting ways other people have chosen to use the language, and saves you some of the back and forth you might encounter on irc. All of that being said, you still need to be able to reason about what you're doing, so in general I recommend it as a get unstuck sometimes tool. There are some hidden gems in there though, if you go to the last page of results for a search term and work backwards. (hint: search for map, go to the last page, and work backwards from there for a bit) You can also find interesting destructuring examples by searching for 'let AND :or', and so on. Anyway, hope it's of use to you or anyone else dropping in on this thread. Happy Clojuring, '(Devin Walters) On Mar 20, 2014, at 22:23, Marcus Blankenship mar...@creoagency.com wrote: Thanks, Alex! Is it kosher to post questions about 4Clojure here? I'm stumped on a few, and simply looking up the answer often isn't helpful... Is there a clojure-noobs list? Sent from my iPhone On Mar 20, 2014, at 8:11 PM, Alex Miller a...@puredanger.com wrote: Hi Marcus, Some great problem sites that can provide opportunities for practice: - http://clojurescriptkoans.com/ (I think everything here is actually Clojure) - http://4clojure.com - make sure to turn on code golf mode and look at others' solutions too - http://exercism.io - get feedback from others on your solutions - https://projecteuler.net/ - http://codingforinterviews.com/ - great email series with practice problems Clojure for Web Development from Pragmatic Press is a new Clojure book that is a little more focused on a problem domain and build a web app. Hope that helps... Alex Miller On Thursday, March 20, 2014 8:08:41 PM UTC-5, Marcus Blankenship wrote: Hi Folks, I'm a post technical PM who's fascinated by Clojure, and want to learn it, but am having a hard time without a real project to work on. It's actually excited me so much I'm considering hanging up my PM hat and diving back in the programmer pool again! My problem appears to be 1) focus, and 2) fear. Focus because I can't (yet) earn a living on a clojure project, so it must be done during off hours. Fear because it's harder and more different than the old OO languages I've used in the past. So I'm curious: how did you learn Clojure well enough to be proficient with it, or how are you working on learning it? Anyone else facing the focus + fear dilemma? Sent from my iPhone -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this
Re: How did you learn Clojure?
Just take it one step at a time. Learning Clojure likely involves more paradigm changes than learning languages in the past, which is why learning those languages seemed easier. I don't think Clojure is inherently harder than regular OO... in fact I think it is a simpler approach, but one that requires you to retrain yourself a little. The way I learned Clojure personally was like this: 1) read some books 2) port a tiny program of mine to Clojure 3) port a slightly bigger one to Clojure 4) get involved in open source and cleanup code and generally do Clojure coding 5) get a job doing 95% Clojure to learn the nitty gritty stuff. 6) keep doing more open source and learning more from the community as I go Have fun with it :) On Thu, Mar 20, 2014 at 11:12 PM, Sean Corfield s...@corfield.org wrote: On Mar 20, 2014, at 6:08 PM, Marcus Blankenship mar...@creoagency.com wrote: So I'm curious: how did you learn Clojure well enough to be proficient with it, or how are you working on learning it? Initial dabbling: The Joy of Clojure and a REPL. Caveat: it's not really an introductory Clojure book but I had past FP experience so I felt I could jump in. Initial serious learning: Attended Amit Rathore's Clojure Bootcamp - one day course for about $300 (if I remember correctly?). Follow-on: 4clojure.com, worked through Clojure in Action as well. Then I picked a handful of small-ish problems we'd already solved at work in other languages and re-coded them in Clojure. Since then it's been a steady stream of tackling increasingly larger problems at work, over a period of about three years. Anyone else facing the focus + fear dilemma? There's a lot less fear if you're used to learning new languages. I try to pick up a new language every year or two: Groovy in 2008/2009, Scala in 2009/2010, Clojure in 2010/2011 (and onward). Dabbled in Ruby, Python, Haskell since then but nothing serious. Very interested in Elm right now. As for focus, yes, you really do need a project. Either pick things you've done before in other languages, or figure out something that would scratch an itch (a small web app, perhaps?) and tackle that. Sean Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Spawn external process and read from output
On Mar 20, 2014, at 9:41 PM, gvim gvi...@gmail.com wrote:
I'm not familiar with the Java standard library and didn't find anything
matching my question on Google so here goes. From my Clojure app I need to
call an executable written in C and parse the text output within my Clojure
app. What's the standard way to call an external process and read its output?
In Ruby I use:
ext = IO.popen '/path/to/file'
ext.readlines.each {|line| process line}
ext.close
(- (clojure.java.shell/sh /path/to/file)
:out
(clojure.string/split #\n))
See:
http://clojure.github.io/clojure/clojure.java.shell-api.html#clojure.java.shell/sh
and:
http://clojure.github.io/clojure/clojure.string-api.html#clojure.string/split
Sean Corfield -- (904) 302-SEAN
An Architect's View -- http://corfield.org/
Perfection is the enemy of the good.
-- Gustave Flaubert, French realist novelist (1821-1880)
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rant / cljs in cljs ? :-)
Hi,
* I'm already using:
:incremental true
:compiler { :optimizations :none }
* I'm also aware of cljs brepl
However:
1) the cljs compiler is still too slow for my liking (even though it's
not calling closure)
2) I don't like the cljs repl nearly as much as I like the clj repl
Now, my dumb/stupid question:
Is there any cljs in cljs _slow_ interpreter? I'm perfectly happy
with an interpreter that runs 10x slower, if, in exchange, I get to
hit refresh and my new code starts running.
Furthermore, I'm _okay_ with their being a big delay every time I
introduce a new macro from clj land.
I realize this sounds spoiled -- but -- the cljs compiler delays are
really really breaking my flow.
Thanks!
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Re: How did you learn Clojure?
Some Lisp books have been translated to Clojure. http://juliangamble.com/blog/2012/07/13/amazing-lisp-books-living-again-in-clojure/ On Thursday, March 20, 2014 11:23:10 PM UTC-7, Marcus Blankenship wrote: Cool, thanks to all who've replied thus far. Question: is there any value in traditional lisp / scheme texts, like SICP, or Little Schemer (etc) or other books like that? I've spent quite a bit of time with them, imagining they would pay off, but I'm not sure that's a normal route to Clojure proficiency. Sent from my iPhone On Mar 20, 2014, at 11:12 PM, Sean Corfield se...@corfield.orgjavascript: wrote: On Mar 20, 2014, at 6:08 PM, Marcus Blankenship mar...@creoagency.comjavascript: wrote: So I'm curious: how did you learn Clojure well enough to be proficient with it, or how are you working on learning it? Initial dabbling: The Joy of Clojure and a REPL. Caveat: it's not really an introductory Clojure book but I had past FP experience so I felt I could jump in. Initial serious learning: Attended Amit Rathore's Clojure Bootcamp - one day course for about $300 (if I remember correctly?). Follow-on: 4clojure.com, worked through Clojure in Action as well. Then I picked a handful of small-ish problems we'd already solved at work in other languages and re-coded them in Clojure. Since then it's been a steady stream of tackling increasingly larger problems at work, over a period of about three years. Anyone else facing the focus + fear dilemma? There's a lot less fear if you're used to learning new languages. I try to pick up a new language every year or two: Groovy in 2008/2009, Scala in 2009/2010, Clojure in 2010/2011 (and onward). Dabbled in Ruby, Python, Haskell since then but nothing serious. Very interested in Elm right now. As for focus, yes, you really do need a project. Either pick things you've done before in other languages, or figure out something that would scratch an itch (a small web app, perhaps?) and tackle that. Sean Corfield -- (904) 302-SEAN An Architect's View -- http://corfield.org/ Perfection is the enemy of the good. -- Gustave Flaubert, French realist novelist (1821-1880) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Perfect Functional Shuffle in Clojure
Thank you, Andy! Both for spotting my mistake and for your comments on style. On Thursday, March 20, 2014 11:34:00 PM UTC+1, Andy Fingerhut wrote: I haven't read all of your code, but note that the Haskell algorithm says it takes a sequence of random values where the first is in the range [0,n-1], the second in the range [0,n-2], third in [0,n-3], etc. Your repeatedly call here: https://github.com/pebrc/ninety-nine-clojure/blob/master/src/ninety_nine_clojure/lists.clj#L273 Is generating a sequence of random values that are all in the range [0,n-1]. A couple of style comments on your function perfect-functional-shuffle: I find it easier to read when a let or loop has multiple bindings on one line if it has commas between the symbol value pairs, e.g.: (loop [bst bst, rnds rnds, acc []] Clojure treats commas in source code as white space. The default case in a cond is most often written :else rather than :otherwise, but both are clear in their meaning and have the same behavior (i.e. any value there other than nil or false will be treated as true). I prefer to write two-branch cond statements using if rather than cond. Andy On Thu, Mar 20, 2014 at 1:59 PM, Peter Brachwitz peter.b...@gmail.comjavascript: wrote: I tried to implement perfect functional shuffle in Clojure as outlined in http://okmij.org/ftp/Haskell/perfect-shuffle.txt This is purely for educational purposes as I am learning Clojure (so please don't be too hard on me if I did something silly) The code: https://github.com/pebrc/ninety-nine-clojure/blob/master/src/ninety_nine_clojure/lists.clj#L267 A related blog post: http://pbrc.blogspot.com/2014/03/99-clojure-problems-25-generate-random.html I would be very happy about any feedback/review. If you have a look at the blog post you will find a histogram that seems to indicate that my perfect functional shuffle is not quite perfect because it is not a uniform distribution. That is almost certainly a mistake on my part, again, I would be very grateful for any hints. Cheers, Peter -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: How did you learn Clojure?
The example I use for starting a new language is talking to a remote JSON API. Plenty to choose from, lets you experiment with libraries (http, json), and work with data structures. Also having lein new myapp speeds things along, since you're not paralyzed on how to begin. JPH On 03/21/2014 09:08 AM, Marcus Blankenship wrote: Hi Folks, I'm a post technical PM who's fascinated by Clojure, and want to learn it, but am having a hard time without a real project to work on. It's actually excited me so much I'm considering hanging up my PM hat and diving back in the programmer pool again! My problem appears to be 1) focus, and 2) fear. Focus because I can't (yet) earn a living on a clojure project, so it must be done during off hours. Fear because it's harder and more different than the old OO languages I've used in the past. So I'm curious: how did you learn Clojure well enough to be proficient with it, or how are you working on learning it? Anyone else facing the focus + fear dilemma? Sent from my iPhone -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [GSoC] Mentor for self-hosting ClojureScript compiler project?
Thanks to everyone for the guidance. I've submitted my proposal, basically using this as a high-level overview of the work that would have to be done. Looking forward to hearing back about the project :) Max On Tuesday, March 18, 2014 9:16:25 AM UTC-7, David Nolen wrote: Max, Just a fair bit of warning that such a project should probably only happen under GSoC only if it actually pushes along *official* support for bootstrapping ClojureScript in ClojureScript. Just forking the compiler and making changes until it works just isn't going to fly and I do not think it's a good use of anyone's time. Such a project has already been attempted in the past and it's now effectively abandon-ware. So working on a separate compiler is not something I think should be under consideration at all for GSoC. The remaining work for CLJS-in-CLJS is actually *not* very ambitious and can likely be completed in the GSoC period: * convert AST manipulation to tools.analyzer * native *compiler* macros (no runtime macro support will be considered for this project) * CLJS port of tools.reader * multimethod perf enhancement This is really all that remains to be done, everything else is really papering over platform details (I/O, symbol translation). If this sounds fun/exciting to you should apply. If it doesn't, I recommend directing your energies elsewhere. I'm more than happy to mentor this, but in order for this to succeed I would like to see work done along these lines from interested parties long before the GSoC period begins. David On Tue, Mar 18, 2014 at 2:42 AM, Max Kreminski maxkre...@gmail.comjavascript: wrote: Hello all, I'm applying to GSoC this year, and I'm interested in taking the opportunity to go full-speed on a project I've been toying with on the side for the last month or so now. Specifically, I'm interested in writing a self-hosting ClojureScript compiler – either by forking the current ClojureScript codebase and making whatever changes are necessary to get it to compile itself, or by putting way more time and energy into the toy CLJS compiler I've been writing from the ground up in my spare time. It's an ambitious project either way, but I've been pleasantly surprised enough by my progress so far that it seems to be within reach. You can see the progress I've made lately on Ceci, the aforementioned toy CLJS compiler, at http://github.com/mkremins/ceci. Fair warning: it's pretty rusty, and a lot of functionality is just plain missing or unsupported at the moment – patching up some of these holes could be part of my summer work if my application gets accepted :) Is anyone interested in mentoring this or a similar project? I'd love to chat. Thanks, Max -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Does lib-nor has function which support https server?
Hi, noir.util.middleware.war- handler startup a http server, then which function support https server? Does lib-nor has function which support https server? thank you. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
namespace dependency
Assuming a set of directories/classpath, is there a simple way to determine the set of namespaces that are dependent on another namespace? in this case, by dependent I mean (for example): A refers B B refers C D dependents of B are A dependents of C are B and A dependents of D are B and A dependents of A are nothing. I had a look at tools.namespace but I didn't see an easy way to do this. Maybe I missed it. Thanks Dave -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
threading operators
I have a chain of operations where i want to use a mixture of - and - (i.e. some functions expect the previous result to be fed into the second item in its sexpr and some expecting it as the last item of its sexpr. What is the neatest way to chain such functions together. perhaps I should write a macro to swap the second and last items of a form? Andy -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: local mutable state
Im also interested as to why the mutable state approach would be less performant? In the single thread case the locks would be optimized out right? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: local mutable state
Excellent point... thanks for the insight On Thursday, 20 March 2014 20:34:47 UTC, tbc++ wrote: Not to mention that this isn't local mutation. You are handing the atom to a closure that then gets wrapped by lazy-seq and returned. So the atom may actually sit around for some time. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: threading operators
Seen this? http://blog.jayfields.com/2012/09/clojure-refactoring-from-thread-last-to.html On Friday, March 21, 2014 7:42:34 AM UTC-4, Andy Smith wrote: I have a chain of operations where i want to use a mixture of - and - (i.e. some functions expect the previous result to be fed into the second item in its sexpr and some expecting it as the last item of its sexpr. What is the neatest way to chain such functions together. perhaps I should write a macro to swap the second and last items of a form? Andy -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: How did you learn Clojure?
It's totally fine to ask here (or on #clojure on IRC). noobs fully welcome. :) On Thursday, March 20, 2014 10:23:42 PM UTC-5, Marcus Blankenship wrote: Thanks, Alex! Is it kosher to post questions about 4Clojure here? I'm stumped on a few, and simply looking up the answer often isn't helpful... Is there a clojure-noobs list? Sent from my iPhone On Mar 20, 2014, at 8:11 PM, Alex Miller al...@puredanger.comjavascript: wrote: Hi Marcus, Some great problem sites that can provide opportunities for practice: - http://clojurescriptkoans.com/ (I think everything here is actually Clojure) - http://4clojure.com - make sure to turn on code golf mode and look at others' solutions too - http://exercism.io - get feedback from others on your solutions - https://projecteuler.net/ - http://codingforinterviews.com/ - great email series with practice problems Clojure for Web Development from Pragmatic Press is a new Clojure book that is a little more focused on a problem domain and build a web app. Hope that helps... Alex Miller On Thursday, March 20, 2014 8:08:41 PM UTC-5, Marcus Blankenship wrote: Hi Folks, I'm a post technical PM who's fascinated by Clojure, and want to learn it, but am having a hard time without a real project to work on. It's actually excited me so much I'm considering hanging up my PM hat and diving back in the programmer pool again! My problem appears to be 1) focus, and 2) fear. Focus because I can't (yet) earn a living on a clojure project, so it must be done during off hours. Fear because it's harder and more different than the old OO languages I've used in the past. So I'm curious: how did you learn Clojure well enough to be proficient with it, or how are you working on learning it? Anyone else facing the focus + fear dilemma? Sent from my iPhone -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com javascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: How did you learn Clojure?
When I started learning clojure back in 2010 I decided to give a presentation about it at work. That set a deadline (about 3 months) in which I had to learn the language. Having said that, I learnt /the language/ however wroting code (toy or not) reading other people's code, getting code reviews (asking for reviews of short snippets in IRC has been great) has been invaluable. Again, you could say the same thing about any other language :) On 21 March 2014 12:31, Alex Miller a...@puredanger.com wrote: It's totally fine to ask here (or on #clojure on IRC). noobs fully welcome. :) On Thursday, March 20, 2014 10:23:42 PM UTC-5, Marcus Blankenship wrote: Thanks, Alex! Is it kosher to post questions about 4Clojure here? I'm stumped on a few, and simply looking up the answer often isn't helpful... Is there a clojure-noobs list? Sent from my iPhone On Mar 20, 2014, at 8:11 PM, Alex Miller al...@puredanger.com wrote: Hi Marcus, Some great problem sites that can provide opportunities for practice: - http://clojurescriptkoans.com/ (I think everything here is actually Clojure) - http://4clojure.com - make sure to turn on code golf mode and look at others' solutions too - http://exercism.io - get feedback from others on your solutions - https://projecteuler.net/ - http://codingforinterviews.com/ - great email series with practice problems Clojure for Web Development from Pragmatic Press is a new Clojure book that is a little more focused on a problem domain and build a web app. Hope that helps... Alex Miller On Thursday, March 20, 2014 8:08:41 PM UTC-5, Marcus Blankenship wrote: Hi Folks, I'm a post technical PM who's fascinated by Clojure, and want to learn it, but am having a hard time without a real project to work on. It's actually excited me so much I'm considering hanging up my PM hat and diving back in the programmer pool again! My problem appears to be 1) focus, and 2) fear. Focus because I can't (yet) earn a living on a clojure project, so it must be done during off hours. Fear because it's harder and more different than the old OO languages I've used in the past. So I'm curious: how did you learn Clojure well enough to be proficient with it, or how are you working on learning it? Anyone else facing the focus + fear dilemma? Sent from my iPhone -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Clojure Cookbook is out
Thanks everyone, it was a blast working on the book. Until next Thursday, you can get 50% off the digital version of the book with the coupon *WKCLJUR http://bit.ly/cc-wkcljr* -Ryan On Thursday, March 20, 2014 10:23:36 AM UTC-4, Thomas wrote: woooh More good books is good for Clojure. Going to order mine today. And a BIG BIG BIG thank you for everyone who has contributed, that is what I love about Clojure (almost ;) ) most, the community!!! Thomas On Thursday, March 20, 2014 1:15:57 PM UTC, Nando Breiter wrote: I got an email from O'Reilly this morning saying that the Clojure Cookbook had been released, and bought it immediately. Thanks to everyone who contributed! It's very helpful. http://shop.oreilly.com/product/0636920029786.do Nando Aria Media Sagl Via Rompada 40 6987 Caslano Switzerland +41 (0)91 600 9601 +41 (0)76 303 4477 cell skype: ariamedia -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: threading operators
yes I saw that, but it only works from thread-first to thread-last? i.e. this works (- x (- f g h)) but I think the following would fail : (- x (- f g h)) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: threading operators
Im wondering if it is worthwhile to create a macro to thread together arbitrary forms (x, f, g, h) injecting the result into different positions into the list as required? (thread-together (- x f - g - h)) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: How did you learn Clojure?
Im in the process of learning, and I found that the clojuretv talks and presentations on youtube were useful. Also the video and sample code for Rich Hickey's Ants demo is an excellent intro to how concurrency works in clojure : https://www.youtube.com/watch?v=dGVqrGmwOAw https://gist.github.com/spacemanaki/1093917 ALso Alex Yakushev's Tetris is worth working though : http://codethat.wordpress.com/2011/09/10/writing-tetris-in-clojure/ -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: namespace dependency
You might take a look at Tim McCormack's Nephila visualizer: https://github.com/timmc/nephila On Fri, Mar 21, 2014 at 6:33 AM, Dave Sann daves...@gmail.com wrote: Assuming a set of directories/classpath, is there a simple way to determine the set of namespaces that are dependent on another namespace? in this case, by dependent I mean (for example): A refers B B refers C D dependents of B are A dependents of C are B and A dependents of D are B and A dependents of A are nothing. I had a look at tools.namespace but I didn't see an easy way to do this. Maybe I missed it. Thanks Dave -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- Chris Jeris cje...@brightcove.com freenode/twitter/github: ystael -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: threading operators
On Fri, 21 Mar 2014, Andy Smith wrote: Im wondering if it is worthwhile to create a macro to thread together arbitrary forms (x, f, g, h) injecting the result into different positions into the list as required? (thread-together (- x f - g - h)) Maybe swiss-arrows has what you are looking for? (- x f (g 1 2 ) (h 3 4) (i 5 6)) https://github.com/rplevy/swiss-arrows Paul -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: How did you learn Clojure?
A little thing but I use it in when teaching Clojure to newbies and maybe it'll be useful for others: https://github.com/lspector/clojinc/blob/master/src/clojinc/core.clj -Lee -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: rant / cljs in cljs ? :-)
are you using lein cljsbuild auto ? That's what I use, and I get about
1-3 sec recompile times for stuff that uses core.async.
Timothy
On Fri, Mar 21, 2014 at 12:48 AM, t x txrev...@gmail.com wrote:
Hi,
* I'm already using:
:incremental true
:compiler { :optimizations :none }
* I'm also aware of cljs brepl
However:
1) the cljs compiler is still too slow for my liking (even though it's
not calling closure)
2) I don't like the cljs repl nearly as much as I like the clj repl
Now, my dumb/stupid question:
Is there any cljs in cljs _slow_ interpreter? I'm perfectly happy
with an interpreter that runs 10x slower, if, in exchange, I get to
hit refresh and my new code starts running.
Furthermore, I'm _okay_ with their being a big delay every time I
introduce a new macro from clj land.
I realize this sounds spoiled -- but -- the cljs compiler delays are
really really breaking my flow.
Thanks!
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zero-they had no way to indicate successful termination of their C
programs.
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Re: threading operators
A generalized threading macro, as-, is built into clojure as of 1.5 (I wonder if clojuredocs.org having so much googlejuice while also being so out of date makes this sort of thing harder to find): (as- /tmp x (foo x) (bar 1 2 x) (baz x 3 4) (quux 5 x 6)) On Fri, Mar 21, 2014 at 7:08 AM, Paul L. Snyder p...@pataprogramming.comwrote: On Fri, 21 Mar 2014, Andy Smith wrote: Im wondering if it is worthwhile to create a macro to thread together arbitrary forms (x, f, g, h) injecting the result into different positions into the list as required? (thread-together (- x f - g - h)) Maybe swiss-arrows has what you are looking for? (- x f (g 1 2 ) (h 3 4) (i 5 6)) https://github.com/rplevy/swiss-arrows Paul -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: rant / cljs in cljs ? :-)
Unless you're compiling a very large file - with auto :optimizations :none
you should always get sub-second compile times under auto.
David
On Fri, Mar 21, 2014 at 10:55 AM, Timothy Baldridge tbaldri...@gmail.comwrote:
are you using lein cljsbuild auto ? That's what I use, and I get about
1-3 sec recompile times for stuff that uses core.async.
Timothy
On Fri, Mar 21, 2014 at 12:48 AM, t x txrev...@gmail.com wrote:
Hi,
* I'm already using:
:incremental true
:compiler { :optimizations :none }
* I'm also aware of cljs brepl
However:
1) the cljs compiler is still too slow for my liking (even though it's
not calling closure)
2) I don't like the cljs repl nearly as much as I like the clj repl
Now, my dumb/stupid question:
Is there any cljs in cljs _slow_ interpreter? I'm perfectly happy
with an interpreter that runs 10x slower, if, in exchange, I get to
hit refresh and my new code starts running.
Furthermore, I'm _okay_ with their being a big delay every time I
introduce a new macro from clj land.
I realize this sounds spoiled -- but -- the cljs compiler delays are
really really breaking my flow.
Thanks!
--
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Re: om component state
On Thursday, March 20, 2014 10:58:08 PM UTC+2, David Nolen wrote: If you don't pass app state data to this component then you don't need to bother with build at all. If you need a component that doesn't need app state but does need component local state you need to use om.core/graft. Refer to the documentation on om.core/graft and look at the examples in the repo. Channels could work. However :shared was also designed with this scenario in mind, you could use an atom with the message in it and placed it in :shared if the message is not an important piece of state for the rest of your application. There are also examples of :shared in the repo as well. HTH, David Thank you for your reply. I've used graft and it works fine with channels. I will also try :shared, but I guess I will have to call refresh! after I swap the shared atom? -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: ANN: Om 0.5.2, Regeant, Quiescent, React interop more
Love it thus far. Big thanks! On Sunday, 9 March 2014 00:39:35 UTC, David Nolen wrote: While I think Om's approach to application state management delivers considerable benefit, I think it would be unfortunate if all the labor put into reusable Om components was confined to Om users. With the latest release I've included examples demonstrating how two important things are now possible: 1) Because of the cursor abstraction you can reinterpret the meaning of transact! For example here is an Om component that can be used from a plain React component http://github.com/swannodette/om/blob/master/examples/stateful/src/core.cljs. No Om requestAnimationFrame render loop or batched updates to be found. 2) Because Om components are one step removed from React components, you can back an Om component with an alternate implementation. For example here is an Om component that has been forced to write its local state into the global application state. http://github.com/swannodette/om/blob/master/examples/harmful/src/core.cljs#L158 Together these features offer a better interoperability story for ClojureScript React users as well as powerful debugging facilities when coupled with :instrument. Feedback welcome! http://github.com/swannodette/om David -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: om component state
On Fri, Mar 21, 2014 at 11:45 AM, Adrian Miron adrian.miron...@gmail.comwrote: On Thursday, March 20, 2014 10:58:08 PM UTC+2, David Nolen wrote: If you don't pass app state data to this component then you don't need to bother with build at all. If you need a component that doesn't need app state but does need component local state you need to use om.core/graft. Refer to the documentation on om.core/graft and look at the examples in the repo. Channels could work. However :shared was also designed with this scenario in mind, you could use an atom with the message in it and placed it in :shared if the message is not an important piece of state for the rest of your application. There are also examples of :shared in the repo as well. HTH, David Thank you for your reply. I've used graft and it works fine with channels. I will also try :shared, but I guess I will have to call refresh! after I swap the shared atom? No the simplest thing would be to call om.core/root again, however if this is not really a global change (i.e. switching logged in user) then you have to pay for re-rendering your entire UI and throwing away all component local state. Sounds like the simplest solution for you is a :shared message channel. Components that care about the message need to set up go loops and update their state when they receive a new message. HTH, David -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: local mutable state
On 3/21/14, 5:44 AM, Andy Smith wrote: Im also interested as to why the mutable state approach would be less performant? In the single thread case the locks would be optimized out right? No locks are used when using atoms, only compare-and-swap (CAS) operations. While CAS operations are fast you don't want to use them unless you need to in a multi-threaded system. Clojure nor the JVM will optimize out the use of them in a single-threaded case like this. They are a very heavy approach when all you need is local mutation. Clojure doesn't have local mutation out of the box.. it is very opinionated on how state should be handled. The example solution posted earlier in the thread is more indiciative of how state like this is handled in clojure. As pointed out earlier in the thread if you wanted/needed to have local mutation you could use https://github.com/ztellman/proteus. In the vast majority of cases this is unneeded. -Ben -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com mailto:clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: How did you learn Clojure?
Hey Devin, I don't think I get getClojure.com. What is it? On Mar 20, 2014, at 10:54 PM, Devin Walters dev...@gmail.com wrote: Shameless self-promotion: http://GetClojure.com is something I wrote to hopefully help people learn Clojure. One of the primary methods I used for learning Clojure was to do problems, like the ones Alex mentioned, read source, and ask questions in irc. The last one is important IMO and it's the reason why I wanted to make something like GetClojure. The expressions you search for are all taken from the irc channel and run through a sandbox so you can see what the value and output is. This lets you investigate interesting ways other people have chosen to use the language, and saves you some of the back and forth you might encounter on irc. All of that being said, you still need to be able to reason about what you're doing, so in general I recommend it as a get unstuck sometimes tool. There are some hidden gems in there though, if you go to the last page of results for a search term and work backwards. (hint: search for map, go to the last page, and work backwards from there for a bit) You can also find interesting destructuring examples by searching for 'let AND :or', and so on. Anyway, hope it's of use to you or anyone else dropping in on this thread. Happy Clojuring, '(Devin Walters) On Mar 20, 2014, at 22:23, Marcus Blankenship mar...@creoagency.com wrote: Thanks, Alex! Is it kosher to post questions about 4Clojure here? I'm stumped on a few, and simply looking up the answer often isn't helpful... Is there a clojure-noobs list? Sent from my iPhone On Mar 20, 2014, at 8:11 PM, Alex Miller a...@puredanger.com wrote: Hi Marcus, Some great problem sites that can provide opportunities for practice: - http://clojurescriptkoans.com/ (I think everything here is actually Clojure) - http://4clojure.com - make sure to turn on code golf mode and look at others' solutions too - http://exercism.io - get feedback from others on your solutions - https://projecteuler.net/ - http://codingforinterviews.com/ - great email series with practice problems Clojure for Web Development from Pragmatic Press is a new Clojure book that is a little more focused on a problem domain and build a web app. Hope that helps... Alex Miller On Thursday, March 20, 2014 8:08:41 PM UTC-5, Marcus Blankenship wrote: Hi Folks, I'm a post technical PM who's fascinated by Clojure, and want to learn it, but am having a hard time without a real project to work on. It's actually excited me so much I'm considering hanging up my PM hat and diving back in the programmer pool again! My problem appears to be 1) focus, and 2) fear. Focus because I can't (yet) earn a living on a clojure project, so it must be done during off hours. Fear because it's harder and more different than the old OO languages I've used in the past. So I'm curious: how did you learn Clojure well enough to be proficient with it, or how are you working on learning it? Anyone else facing the focus + fear dilemma? Sent from my iPhone -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You
Re: How to update an atom return the change?
Thanks a lot, Stephen!
21. mars 2014 00:57 skrev Stephen Gilardi scgila...@gmail.com følgende:
There was a stackoverflow question recently that requested a solution for
a similar problem:
https://stackoverflow.com/questions/22409638/remove-first-item-from-clojure-vector-atom-and-return-it
One solution there is similar to this:
(defn swap*!
Like swap! but returns a vector of [old-value new-value]
[atom f args]
(loop [old-value @atom]
(let [new-value (apply f old-value args)]
(if (compare-and-set! atom old-value new-value)
[old-value new-value]
(recur @atom)
This will return the correct old-value and new-value which you can diff.
Another note:
(swap! state #(update-in % [:teams] make-team))
can be written more succinctly:
(swap! state update-in [:teams] make-team)
—Steve
On Mar 20, 2014, at 6:28 PM, Jakub Holy jakub.h...@iterate.no wrote:
I have couple of times run into a situation where I want to update a state
map held in an atom
and return the change, not the new value. I haven't found a good way to do
it so either I am missing
something obvious or there are more idiomatic ways to achieve what I need.
Could you advise me?
A concrete example: In ma webapp I want to assign a unique random ID to
each user. Creating that ID is simple:
(def state (atom {:teams {}}))
;; Remove already used IDs from a lazy seq of random IDs (= unique), take
the 1st one
(defn unique-rand-id [id-set]
(first (remove id-set (repeatedly #(rand-int Integer/MAX_VALUE))
;; Add a new team with a unique random ID to the teams map
(defn make-team [teams]
(let [id (unique-rand-id (set (keys teams)))]
(assoc teams id {})))
;; Create a new team; TODO: How to get the new team's ID?!
(swap! state #(update-in % [:teams] make-team))
So I can generate and remember a new unique random ID but there is no way
to find out
what ID it was (I cannot just take diff of state before and after since
other threads could
have also added new IDs to it in the meanwhile.)
Any advice is appreciated. Thank you!
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Re: threading operators
Ha! thats perfect! I have seen that one but obviously overlooked it. On Friday, 21 March 2014 15:21:03 UTC, John Wiseman wrote: A generalized threading macro, as-, is built into clojure as of 1.5 (I wonder if clojuredocs.org having so much googlejuice while also being so out of date makes this sort of thing harder to find): (as- /tmp x (foo x) (bar 1 2 x) (baz x 3 4) (quux 5 x 6)) On Fri, Mar 21, 2014 at 7:08 AM, Paul L. Snyder pa...@pataprogramming.comjavascript: wrote: On Fri, 21 Mar 2014, Andy Smith wrote: Im wondering if it is worthwhile to create a macro to thread together arbitrary forms (x, f, g, h) injecting the result into different positions into the list as required? (thread-together (- x f - g - h)) Maybe swiss-arrows has what you are looking for? (- x f (g 1 2 ) (h 3 4) (i 5 6)) https://github.com/rplevy/swiss-arrows Paul -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: rant / cljs in cljs ? :-)
I'm using:
lein pdo cljx auto,cljsbuild auto dev'
However, maybe perhaps it's weird timing interaction between cljx and
cljsbuild that's making the lag appear more than it actually is.
On Fri, Mar 21, 2014 at 8:27 AM, David Nolen dnolen.li...@gmail.com wrote:
Unless you're compiling a very large file - with auto :optimizations :none
you should always get sub-second compile times under auto.
David
On Fri, Mar 21, 2014 at 10:55 AM, Timothy Baldridge tbaldri...@gmail.com
wrote:
are you using lein cljsbuild auto ? That's what I use, and I get about
1-3 sec recompile times for stuff that uses core.async.
Timothy
On Fri, Mar 21, 2014 at 12:48 AM, t x txrev...@gmail.com wrote:
Hi,
* I'm already using:
:incremental true
:compiler { :optimizations :none }
* I'm also aware of cljs brepl
However:
1) the cljs compiler is still too slow for my liking (even though it's
not calling closure)
2) I don't like the cljs repl nearly as much as I like the clj repl
Now, my dumb/stupid question:
Is there any cljs in cljs _slow_ interpreter? I'm perfectly happy
with an interpreter that runs 10x slower, if, in exchange, I get to
hit refresh and my new code starts running.
Furthermore, I'm _okay_ with their being a big delay every time I
introduce a new macro from clj land.
I realize this sounds spoiled -- but -- the cljs compiler delays are
really really breaking my flow.
Thanks!
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tools.namespace.repl refresh is trying to refresh test dependencies we don't need
Hi all, clojure.tools.namespace.repl/refresh tries to load (and run) the test files from a dependent project and, since we don't use midje on the main project, it fails when it can't find midje on the classpath. The dependent project is a symlink in the checkouts directory, and that project depends on midje in its :dev profile. I am starting the repl through cider-jack-in, and the :dev profile is active in the main project, but from reading the lein docs it seems that maybe the :dev profile isn't being activated for the dependent project? I could add midje as a depency in my main project (which is what I'm doing now to stop the error), but is there a better way to fix this? Thanks to anyone who can help solve this. Chris. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: rant / cljs in cljs ? :-)
This particular trick is a clever one (that I'm afraid I've had some
hand in propagating, for the benefit of those that like an auto +
browser refresh workflow), but it's never going to be particularly
efficient. By its very nature, pdo sets up cljx and cljsbuild off and
running without any coordination; it's equivalent to running the two
tasks in separate processes.
It's possible that some hooks may become available in cljsbuild so that
things like cljx can do what they like prior to each compile, but that's
speculative.
IMO, a REPL-based workflow is far superior to anything involving
reloading your app's page, insofar as you can (nearly always) apply the
changes you're working on without blowing away the state of the app. In
this context, cljx's nREPL middleware excels (but unfortunately cannot
be used with the stock ClojureScript browser-REPL; check out Austin).
Note that cljx has not been optimized _at all_. It's fast enough for
my purposes (i.e. reasonable when doing a clean rebuild, and snappy when
doing the small changes typical in a REPL). I'd be happy to merge
reasonable patches that make the actual cljx transformation faster.
- Chas
On 03/21/2014 01:23 PM, t x wrote:
I'm using:
lein pdo cljx auto,cljsbuild auto dev'
However, maybe perhaps it's weird timing interaction between cljx and
cljsbuild that's making the lag appear more than it actually is.
On Fri, Mar 21, 2014 at 8:27 AM, David Nolen dnolen.li...@gmail.com wrote:
Unless you're compiling a very large file - with auto :optimizations :none
you should always get sub-second compile times under auto.
David
On Fri, Mar 21, 2014 at 10:55 AM, Timothy Baldridge tbaldri...@gmail.com
wrote:
are you using lein cljsbuild auto ? That's what I use, and I get about
1-3 sec recompile times for stuff that uses core.async.
Timothy
On Fri, Mar 21, 2014 at 12:48 AM, t x txrev...@gmail.com wrote:
Hi,
* I'm already using:
:incremental true
:compiler { :optimizations :none }
* I'm also aware of cljs brepl
However:
1) the cljs compiler is still too slow for my liking (even though it's
not calling closure)
2) I don't like the cljs repl nearly as much as I like the clj repl
Now, my dumb/stupid question:
Is there any cljs in cljs _slow_ interpreter? I'm perfectly happy
with an interpreter that runs 10x slower, if, in exchange, I get to
hit refresh and my new code starts running.
Furthermore, I'm _okay_ with their being a big delay every time I
introduce a new macro from clj land.
I realize this sounds spoiled -- but -- the cljs compiler delays are
really really breaking my flow.
Thanks!
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Re: local mutable state
Also, you can use straight up java as well inside of loops. I, sometimes, will write a static method, dump the clojure data strcuture over to java, mutate like a crazy man, then slap it back into clojure. I find that loop recur are not as elegant as imperative styles of looping(an opinion of course). I think of recursion as a low level operation, it is a outlier in clojure where most of the time we swim in an abstraction bliss. Anyway, I find using pattern matching in conjunction with recursion makes it far more elegant... https://github.com/clojure/core.match On Friday, March 21, 2014 7:48:24 AM UTC-4, Andy Smith wrote: Excellent point... thanks for the insight On Thursday, 20 March 2014 20:34:47 UTC, tbc++ wrote: Not to mention that this isn't local mutation. You are handing the atom to a closure that then gets wrapped by lazy-seq and returned. So the atom may actually sit around for some time. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[ANN] clojure-contracts-maps 0.1.0
Hello all, I've pushed to Clojars the first cut of a new library: clojure-contracts-mapshttps://github.com/ianrumford/clojure-contracts-maps The library enables you to apply contracts to the values of map keys by creating getter and putter accessor functions. It also has a few other features including the option to transform the new value of a key before the map is updated (e.g. to normalise the value in some way). Similarly you can transform the existing value (get) before its returned (to create a derivative view). I've put together a blog posthttp://ianrumford.github.io/blog/2014/03/19/two-sugars-with-your-contracts-for-clojure-maps/ giving many more details. This library builds on my clojure-contracts-sugarhttps://github.com/ianrumford/clojure-contracts-sugar library I posted and bloggedhttp://ianrumford.github.io/blog/2014/02/19/a-little-sugar-with-your-clojure-aspect-contracts/ about a month or so ago. A shout-out to Fogus and his clojure.core.contracts library which made all this possible. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Concurrently updating two structures
Say I have two data structures.. enemies bullets I want to update them like so... (some-game-loop (update enemies) (update bullets)) If I wanted to make sure that both structures were getting updated at the same time instead of enemies and then bullets; would I use refs here or would I use something else? What if there were many more structures that I wanted to update asynchronously like this? Thanks clojurians! -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Concurrently updating two structures
For coordination of this type you could either a) use refs and the STM or b) put them in the same nested datastructure and put them both in an atom. The latter approach is what I would recommend and what people generally tend to do. If you go down this route you end up with the entire state of your game in a single atom. The tradeoffs is that you loose the ability to observe certain changes at a granular layer and you drive the contention to a single point (which has been discussed recently on another thread). On the flip side you end up with a single value that represents your application's state that is easy to work with. On 3/21/14, 1:42 PM, Jacob Goodson wrote: Say I have two data structures.. enemies bullets I want to update them like so... (some-game-loop (update enemies) (update bullets)) If I wanted to make sure that both structures were getting updated at the same time instead of enemies and then bullets; would I use refs here or would I use something else? What if there were many more structures that I wanted to update asynchronously like this? Thanks clojurians! -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com mailto:clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Concurrently updating two structures
If they were nested what would I use to update them simultaneously? Futures, then roll a loop that would wait till both are realized? On Friday, March 21, 2014 4:00:03 PM UTC-4, Ben Mabey wrote: For coordination of this type you could either a) use refs and the STM or b) put them in the same nested datastructure and put them both in an atom. The latter approach is what I would recommend and what people generally tend to do. If you go down this route you end up with the entire state of your game in a single atom. The tradeoffs is that you loose the ability to observe certain changes at a granular layer and you drive the contention to a single point (which has been discussed recently on another thread). On the flip side you end up with a single value that represents your application's state that is easy to work with. On 3/21/14, 1:42 PM, Jacob Goodson wrote: Say I have two data structures.. enemies bullets I want to update them like so... (some-game-loop (update enemies) (update bullets)) If I wanted to make sure that both structures were getting updated at the same time instead of enemies and then bullets; would I use refs here or would I use something else? What if there were many more structures that I wanted to update asynchronously like this? Thanks clojurians! -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com javascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Concurrently updating two structures
It doesn't need to be simultaneous within the actual update function (the function that's passed in to swap!), it needs to be simultaneous just as far as the atom state-change is concerned. A faster update function means less contention and restarts. On Fri, Mar 21, 2014 at 4:13 PM, Jacob Goodson submissionfight...@gmx.comwrote: If they were nested what would I use to update them simultaneously? Futures, then roll a loop that would wait till both are realized? On Friday, March 21, 2014 4:00:03 PM UTC-4, Ben Mabey wrote: For coordination of this type you could either a) use refs and the STM or b) put them in the same nested datastructure and put them both in an atom. The latter approach is what I would recommend and what people generally tend to do. If you go down this route you end up with the entire state of your game in a single atom. The tradeoffs is that you loose the ability to observe certain changes at a granular layer and you drive the contention to a single point (which has been discussed recently on another thread). On the flip side you end up with a single value that represents your application's state that is easy to work with. On 3/21/14, 1:42 PM, Jacob Goodson wrote: Say I have two data structures.. enemies bullets I want to update them like so... (some-game-loop (update enemies) (update bullets)) If I wanted to make sure that both structures were getting updated at the same time instead of enemies and then bullets; would I use refs here or would I use something else? What if there were many more structures that I wanted to update asynchronously like this? Thanks clojurians! -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Concurrently updating two structures
Ok, I don't think I am communicating or/either comprehending correctly... it needs to be simultaneous just as far as the atom state-change is concerned How do I do this? Once the atom is derefenced I would have access to the structures but I need to know how to make sure my code does not sequentially update them one at a time. Obviously, I do not want to write something that updates the enemies and, after the enemies are fully updated, the bullets get updated. I need something that updates enemies while updating the bullets, at the same time. Maybe a code example would help? On Friday, March 21, 2014 4:15:36 PM UTC-4, Gary Trakhman wrote: It doesn't need to be simultaneous within the actual update function (the function that's passed in to swap!), it needs to be simultaneous just as far as the atom state-change is concerned. A faster update function means less contention and restarts. On Fri, Mar 21, 2014 at 4:13 PM, Jacob Goodson submissio...@gmx.comjavascript: wrote: If they were nested what would I use to update them simultaneously? Futures, then roll a loop that would wait till both are realized? On Friday, March 21, 2014 4:00:03 PM UTC-4, Ben Mabey wrote: For coordination of this type you could either a) use refs and the STM or b) put them in the same nested datastructure and put them both in an atom. The latter approach is what I would recommend and what people generally tend to do. If you go down this route you end up with the entire state of your game in a single atom. The tradeoffs is that you loose the ability to observe certain changes at a granular layer and you drive the contention to a single point (which has been discussed recently on another thread). On the flip side you end up with a single value that represents your application's state that is easy to work with. On 3/21/14, 1:42 PM, Jacob Goodson wrote: Say I have two data structures.. enemies bullets I want to update them like so... (some-game-loop (update enemies) (update bullets)) If I wanted to make sure that both structures were getting updated at the same time instead of enemies and then bullets; would I use refs here or would I use something else? What if there were many more structures that I wanted to update asynchronously like this? Thanks clojurians! -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Concurrently updating two structures
update them one at a time. Obviously, I do not want to write something that updates the enemies and, after the enemies are fully updated, the bullets get updated. I need something that updates enemies while updating the bullets, at the same time. Maybe a code example would help? er... i suspect you need to explain better... it doesn't make any sense to me what you are saying. you have to break out what you mean by updating, and why they obviously cannot be done sequentially. since, i suspect, that's how most all games have done it since the dawn of 8 bit cpus :-) no? i suspect you are saying you don't want enemies to step beyond a bullet or some such issue. but waving some magic concurrency pixie dust is not a solution, at least if you aren't able to explain how it *would* be a solution. generally in simple simulations you accept a certain finite time step that things jump. and you have to deal with that explicitly e.g. in your collision detection or whatever. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Concurrently updating two structures
Check out my collision detection here: https://github.com/gtrak/quilltest/blob/master/src/quilltest/balls.clj#L117 I build a map of collided pairs first, then I run through the whole thing to update the relevant stuff. On Fri, Mar 21, 2014 at 4:37 PM, Raoul Duke rao...@gmail.com wrote: update them one at a time. Obviously, I do not want to write something that updates the enemies and, after the enemies are fully updated, the bullets get updated. I need something that updates enemies while updating the bullets, at the same time. Maybe a code example would help? er... i suspect you need to explain better... it doesn't make any sense to me what you are saying. you have to break out what you mean by updating, and why they obviously cannot be done sequentially. since, i suspect, that's how most all games have done it since the dawn of 8 bit cpus :-) no? i suspect you are saying you don't want enemies to step beyond a bullet or some such issue. but waving some magic concurrency pixie dust is not a solution, at least if you aren't able to explain how it *would* be a solution. generally in simple simulations you accept a certain finite time step that things jump. and you have to deal with that explicitly e.g. in your collision detection or whatever. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Concurrently updating two structures
Lol...my goodness... I am just using this as a learning exercise, I do not need to be lectured about how to write a game loop... I said obviously since that was my original request, I am only asking to learn clojure a little better. I could just drop into java and write a serial loop that does this really fast but I don't care about that; also, telling me how something was done on an 8-bit computer is about as relevant as explaining to me the intricate biological reactions involved in elephant defecation. On Friday, March 21, 2014 4:37:22 PM UTC-4, raould wrote: update them one at a time. Obviously, I do not want to write something that updates the enemies and, after the enemies are fully updated, the bullets get updated. I need something that updates enemies while updating the bullets, at the same time. Maybe a code example would help? er... i suspect you need to explain better... it doesn't make any sense to me what you are saying. you have to break out what you mean by updating, and why they obviously cannot be done sequentially. since, i suspect, that's how most all games have done it since the dawn of 8 bit cpus :-) no? i suspect you are saying you don't want enemies to step beyond a bullet or some such issue. but waving some magic concurrency pixie dust is not a solution, at least if you aren't able to explain how it *would* be a solution. generally in simple simulations you accept a certain finite time step that things jump. and you have to deal with that explicitly e.g. in your collision detection or whatever. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Concurrently updating two structures
Thanks for the code. On Friday, March 21, 2014 4:41:34 PM UTC-4, Gary Trakhman wrote: Check out my collision detection here: https://github.com/gtrak/quilltest/blob/master/src/quilltest/balls.clj#L117 I build a map of collided pairs first, then I run through the whole thing to update the relevant stuff. On Fri, Mar 21, 2014 at 4:37 PM, Raoul Duke rao...@gmail.comjavascript: wrote: update them one at a time. Obviously, I do not want to write something that updates the enemies and, after the enemies are fully updated, the bullets get updated. I need something that updates enemies while updating the bullets, at the same time. Maybe a code example would help? er... i suspect you need to explain better... it doesn't make any sense to me what you are saying. you have to break out what you mean by updating, and why they obviously cannot be done sequentially. since, i suspect, that's how most all games have done it since the dawn of 8 bit cpus :-) no? i suspect you are saying you don't want enemies to step beyond a bullet or some such issue. but waving some magic concurrency pixie dust is not a solution, at least if you aren't able to explain how it *would* be a solution. generally in simple simulations you accept a certain finite time step that things jump. and you have to deal with that explicitly e.g. in your collision detection or whatever. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Concurrently updating two structures
I am just using this as a learning exercise, I do not need to be lectured about how to write a game loop... I said obviously since that was my original request, I am only asking to learn clojure a little better. I could just drop into java and write a serial loop that does this really fast but I don't care about that; also, telling me how something was done on an 8-bit computer is about as relevant as explaining to me the intricate biological reactions involved in elephant defecation. you're hired! :-) -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[ANN] thi.ng/morphogen - Declarative 3D form evolution through tree-based transformations
Hi all, I've just pushed the first (promising) beginnings of a new project to GH and would like to share with you: https://github.com/thi-ng/morphogen/ Building on top of its companions, the recently announced thi.ng/geom thi.ng/luxor libraries, morphogen provides a set of extensible building blocks to generate complex 3d structures in a completely data driven, declarative style. As usual for this project series, this too is developed in a literate format and even though it's still early days, there's quite a bit of background info, result renders and detailed descriptions available already. Since the weekend is upon us and maybe one or two of you are interested too in these things, I'd highly appreciate if some critical and/or creative eyeballs could go over this. Please take a peek, if you can! Some small examples (and their renders) I've been using for testing various bits are here: https://github.com/thi-ng/morphogen/blob/master/src/examples.org Things I'm actively working on over the next weeks: - new deform operators - export operator tree as graphviz file - develop HTML5 GUI for operator tree editing Thank you for your consideration! :) K. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Clojure 1.6.0-RC1 - LAST CHANCE, PLEASE TEST
Hi, after two days of git bisecting and running my tests over and over again, I give up. While I can repeatedly identify the commit which causes the biggest slowdown for me between the 1.5.1 tag and 1.6.0 RC1 I simply refuse to believe that the result of my analysis is correct. On 5045ac124e24ed1fe02be86a10f7f212a4dc everything is fine, on 96f5b5bdcae44ccc69e33d701e6188dc2570dadf things are slow. And no, I am not running into the exception. I can only guess that there is some error on my side. I do not think, the slowdown I reported based upon this program should be no reason to delay 1.6.0. (Even though I'd still like to understand what's going on.) Best, stefan -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
apply to quoted form
I came across the following issue when doing problem user= (let [f '(+ 1 1)] (apply (first f) (rest f))) 1 I could use eval but eval is bad (apparently)... Investigating this further I can see that : user= (let [f '(+ 1 1)] (type (first f))) clojure.lang.Symbol wheras : user= (type +) clojure.core$_PLUS_ It would seem that I still need to call eval on the '+ at least, in order to resolve it to a function, but eval is still bad (apparently). I could create a map of symbol to function and I can see that others have done the same, but this seems a bit verbose because clojure will do that for me with eval. If the map is the correct approach then why is it any better than eval? What is the correct thing to do here? Im sure this is revealing some fundamental misunderstanding that I have... :o/ -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: apply to quoted form
that is 'problem 121 from 4clojure' http://www.4clojure.com/problem/121 -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: How to update an atom return the change?
For the interested, this is my (certainly pretty imperfect) solution for
changing a value in a state map and returning the old and new value (that
can be safely diffed to get the change):
(defn swap-in!
Combination of update-in and swap! returning the value at the path
before and after.
[atom path f args]
(loop []
(let [old-a @atom
old-val (get-in old-a path)
new-val (apply f (cons old-val args))
new-a (assoc-in old-a path new-val)]
(if (compare-and-set! atom old-a new-a)
[old-val new-val]
(recur)
;; example:
(swap-in! (atom {:k 1}) [:k] + 2) ;; = [1 3]
2014-03-21 0:57 GMT+01:00 Stephen Gilardi scgila...@gmail.com:
There was a stackoverflow question recently that requested a solution for
a similar problem:
https://stackoverflow.com/questions/22409638/remove-first-item-from-clojure-vector-atom-and-return-it
One solution there is similar to this:
(defn swap*!
Like swap! but returns a vector of [old-value new-value]
[atom f args]
(loop [old-value @atom]
(let [new-value (apply f old-value args)]
(if (compare-and-set! atom old-value new-value)
[old-value new-value]
(recur @atom)
This will return the correct old-value and new-value which you can diff.
Another note:
(swap! state #(update-in % [:teams] make-team))
can be written more succinctly:
(swap! state update-in [:teams] make-team)
—Steve
On Mar 20, 2014, at 6:28 PM, Jakub Holy jakub.h...@iterate.no wrote:
I have couple of times run into a situation where I want to update a state
map held in an atom
and return the change, not the new value. I haven't found a good way to do
it so either I am missing
something obvious or there are more idiomatic ways to achieve what I need.
Could you advise me?
A concrete example: In ma webapp I want to assign a unique random ID to
each user. Creating that ID is simple:
(def state (atom {:teams {}}))
;; Remove already used IDs from a lazy seq of random IDs (= unique), take
the 1st one
(defn unique-rand-id [id-set]
(first (remove id-set (repeatedly #(rand-int Integer/MAX_VALUE))
;; Add a new team with a unique random ID to the teams map
(defn make-team [teams]
(let [id (unique-rand-id (set (keys teams)))]
(assoc teams id {})))
;; Create a new team; TODO: How to get the new team's ID?!
(swap! state #(update-in % [:teams] make-team))
So I can generate and remember a new unique random ID but there is no way
to find out
what ID it was (I cannot just take diff of state before and after since
other threads could
have also added new IDs to it in the meanwhile.)
Any advice is appreciated. Thank you!
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Re: rant / cljs in cljs ? :-)
I really hope that a small plugin to coordinate cljx/cljsbuild will show
up in the near future. I found cljsbuild's crossovers much better
integrated and easier to use (but still far inferior to cljx).
I agree that a REPL based workflow is much superior, especially with
tools like Om which remove the need to coordinate DOM updates.
Chas Emerick writes:
This particular trick is a clever one (that I'm afraid I've had some
hand in propagating, for the benefit of those that like an auto +
browser refresh workflow), but it's never going to be particularly
efficient. By its very nature, pdo sets up cljx and cljsbuild off and
running without any coordination; it's equivalent to running the two
tasks in separate processes.
It's possible that some hooks may become available in cljsbuild so that
things like cljx can do what they like prior to each compile, but that's
speculative.
IMO, a REPL-based workflow is far superior to anything involving
reloading your app's page, insofar as you can (nearly always) apply the
changes you're working on without blowing away the state of the app. In
this context, cljx's nREPL middleware excels (but unfortunately cannot
be used with the stock ClojureScript browser-REPL; check out Austin).
Note that cljx has not been optimized _at all_. It's fast enough for
my purposes (i.e. reasonable when doing a clean rebuild, and snappy when
doing the small changes typical in a REPL). I'd be happy to merge
reasonable patches that make the actual cljx transformation faster.
- Chas
On 03/21/2014 01:23 PM, t x wrote:
I'm using:
lein pdo cljx auto,cljsbuild auto dev'
However, maybe perhaps it's weird timing interaction between cljx and
cljsbuild that's making the lag appear more than it actually is.
On Fri, Mar 21, 2014 at 8:27 AM, David Nolen dnolen.li...@gmail.com wrote:
Unless you're compiling a very large file - with auto :optimizations :none
you should always get sub-second compile times under auto.
David
On Fri, Mar 21, 2014 at 10:55 AM, Timothy Baldridge tbaldri...@gmail.com
wrote:
are you using lein cljsbuild auto ? That's what I use, and I get about
1-3 sec recompile times for stuff that uses core.async.
Timothy
On Fri, Mar 21, 2014 at 12:48 AM, t x txrev...@gmail.com wrote:
Hi,
* I'm already using:
:incremental true
:compiler { :optimizations :none }
* I'm also aware of cljs brepl
However:
1) the cljs compiler is still too slow for my liking (even though it's
not calling closure)
2) I don't like the cljs repl nearly as much as I like the clj repl
Now, my dumb/stupid question:
Is there any cljs in cljs _slow_ interpreter? I'm perfectly happy
with an interpreter that runs 10x slower, if, in exchange, I get to
hit refresh and my new code starts running.
Furthermore, I'm _okay_ with their being a big delay every time I
introduce a new macro from clj land.
I realize this sounds spoiled -- but -- the cljs compiler delays are
really really breaking my flow.
Thanks!
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Re: Clojure 1.6.0-RC1 - LAST CHANCE, PLEASE TEST
That is odd. This is a shot in the dark, and probably unhelpful because I do not know a good way to verify whether my guess is true, but perhaps the seqFrom method went from being small enough to be inlined by your JIT before that change, to being too large to consider for inlining after the change? It isn't a big change in the code, so it would have to have been close to the threshold if this is true. Andy On Fri, Mar 21, 2014 at 3:51 PM, Stefan Kamphausen ska2...@gmail.comwrote: Hi, after two days of git bisecting and running my tests over and over again, I give up. While I can repeatedly identify the commit which causes the biggest slowdown for me between the 1.5.1 tag and 1.6.0 RC1 I simply refuse to believe that the result of my analysis is correct. On 5045ac124e24ed1fe02be86a10f7f212a4dc everything is fine, on 96f5b5bdcae44ccc69e33d701e6188dc2570dadf things are slow. And no, I am not running into the exception. I can only guess that there is some error on my side. I do not think, the slowdown I reported based upon this program should be no reason to delay 1.6.0. (Even though I'd still like to understand what's going on.) Best, stefan -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: apply to quoted form
Andy Smith writes: I came across the following issue when doing problem user= (let [f '(+ 1 1)] (apply (first f) (rest f))) 1 I could use eval but eval is bad (apparently)... Investigating this further I can see that : user= (let [f '(+ 1 1)] (type (first f))) clojure.lang.Symbol wheras : user= (type +) clojure.core$_PLUS_ It would seem that I still need to call eval on the '+ at least, in order to resolve it to a function, but eval is still bad (apparently). I could create a map of symbol to function and I can see that others have done the same, but this seems a bit verbose because clojure will do that for me with eval. If the map is the correct approach then why is it any better than eval? What is the correct thing to do here? Im sure this is revealing some fundamental misunderstanding that I have... :o/ You want to read about the connection between Vars, Namespaces and Symbols. Please don't see the following as a good summary for these topics, it just illustrates the concepts in the scope of your problem: A var, for example #'clojure.core/+, is a way to refer to a storage location. #'clojure.core/+ is a var which 'contains' a function which adds numbers. A Namespace (for example clojure.core) is just a collection of vars. A symbol is a form of identifier. '+ is a symbol. You start with the symbol +. The function `(ns-resolve ns sym)' will try to find a var in `ns' with the same name as `sym' and return it. In the end, you want to call the function behind the var, so you have to use `var-get' to get the value the var points to. -- Moritz Ulrich pgphkZl7qIu1U.pgp Description: PGP signature
Re: apply to quoted form
On Fri, Mar 21, 2014 at 3:55 PM, Andy Smith the4thamig...@googlemail.comwrote: I came across the following issue when doing problem user= (let [f '(+ 1 1)] (apply (first f) (rest f))) 1 That's interesting. It seems it's the last form in the list that's being returned, and it doesn't matter what function you apply (apply '+ '(2 1)) ;= 1 (apply '+ '(1 2)) ;= 2 (apply 'map '(2 1)) ;= 1 I don't have any immediate thoughts on why it behaves like that, though I'm sure there's a reason (?). I could use eval but eval is bad (apparently)... You could use clojure.core/resolve instead, I think that should be safe. (let [f '(+ 1 1)] (apply (resolve (first f) (rest f ;= 2 -- John Mastro -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Clojure 1.6.0-RC1 - LAST CHANCE, PLEASE TEST
On Saturday, March 22, 2014 12:41:55 AM UTC+1, Andy Fingerhut wrote: That is odd. This is a shot in the dark, and probably unhelpful because I do not know a good way to verify whether my guess is true, but perhaps the seqFrom method went from being small enough to be inlined by your JIT before that change, to being too large to consider for inlining after the change? It isn't a big change in the code, so it would have to have been close to the threshold if this is true. if there is anything I can do to test this, just let me know. Best, stefan -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: apply to quoted form
On Fri, Mar 21, 2014 at 4:44 PM, John Mastro john.b.mas...@gmail.comwrote: (let [f '(+ 1 1)] (apply (resolve (first f) (rest f ;= 2 Sorry, I have a typo in there. It should be: (let [f '(+ 1 1)] (apply (resolve (first f)) (rest f))) -- John Mastro -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: apply to quoted form
On Fri, Mar 21, 2014 at 4:44 PM, John Mastro john.b.mas...@gmail.comwrote: That's interesting. It seems it's the last form in the list that's being returned, and it doesn't matter what function you apply Sigh, clearly sometimes I type faster than I think. That should be it doesn't matter what symbol you apply, since as you already noted it's not a function object at all. -- John Mastro -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: apply to quoted form
This happens because a Symbol is a function that looks itself up in its
argument much like Keywords do:
user= ('a {'a 2 'b 3})
2
user= ('b {'a 2 'b 3})
3
user= ('b 42)
nil
And the two argument version provides a default value to return if the symbol
is not found:
user= ('c {'a 2 'b 3} ::not-found)
:user/not-found
user= ('c not a map ::not-found)
:user/not-found
Sean
On Mar 21, 2014, at 4:44 PM, John Mastro john.b.mas...@gmail.com wrote:
On Fri, Mar 21, 2014 at 3:55 PM, Andy Smith the4thamig...@googlemail.com
wrote:
I came across the following issue when doing problem
user= (let [f '(+ 1 1)] (apply (first f) (rest f)))
1
That's interesting. It seems it's the last form in the list that's being
returned, and it doesn't matter what function you apply
(apply '+ '(2 1)) ;= 1
(apply '+ '(1 2)) ;= 2
(apply 'map '(2 1)) ;= 1
I don't have any immediate thoughts on why it behaves like that, though
I'm sure there's a reason (?).
I could use eval but eval is bad (apparently)...
You could use clojure.core/resolve instead, I think that should be safe.
(let [f '(+ 1 1)]
(apply (resolve (first f) (rest f
;= 2
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Re: How did you learn Clojure?
A tip if you are completely stuck on 4clojure: Often the 4clojure problem will say you can't use a particular function. The first thing I would do is go look at the source code for that function, then I would try to find other functions with similar functionality. Much like learning to paint or write, you have to copy first. Eventually looking through all that source code you will start to develop a sense of how a problem can be solved, and in giving any solution 4clojure lets you look at the solutions of others. Look at the most prolific 4clojure users, their solutions will teach you a lot. Look up the functions they used. In order to learn to Think in Clojure you need to understand how someone who already can\does did what they did. Another general tip is to harness momentum, when I started learning I picked one thing that I could completely finish in a day. And the trick is to dream small, some things I did: - List the files in a directory and sort them by type. - A crypto-quote assist\solver. - A small text based adventure game. The goal is to get a WHOLE thing done, even if it is a small thing. I did this 2-3 times a week. Porting old code you have done before in another language is great too because the big issue here will be learning to turn OO\Imperative code into functional code. I also wrote a blog post listing the resources I used when just getting started: http://jarrodswart.com/beginner-resources-clojure/, and a super friendly 10k foot view of the reduce function: http://jarrodswart.com/clojure-like-im-five-reduce-functions/. Hope this helps, Jarrod -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: How to update an atom return the change?
Just to add to this because I ran across this reading some code a few days ago: https://github.com/overtone/at-at/blob/master/src/overtone/at_at.clj#L43-51 -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[ANN] Clojure 1.6.0-RC2
Clojure 1.6.0-RC2 is now available. Try it via - Download: http://central.maven.org/maven2/org/clojure/clojure/1.6.0-RC2 - Leiningen: [org.clojure/clojure 1.6.0-RC2] See the full change log here: https://github.com/clojure/clojure/blob/master/changes.md Clojure 1.6.0-RC2 has the following changes since 1.6.0-RC1: - String hasheq calculation has changed so it can leverage cached String hashCode - [CLJ-1387] reduce-kv on large hash maps ignores reduced result Please let us know how it looks - we would like to make this 1.6.0 final. Alex -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: Clojure 1.6.0-RC1 - LAST CHANCE, PLEASE TEST
That's pretty weird. 1.6.0-RC2 is out now - I would really appreciate it if you could give it a shot. Alex On Friday, March 21, 2014 5:51:14 PM UTC-5, Stefan Kamphausen wrote: Hi, after two days of git bisecting and running my tests over and over again, I give up. While I can repeatedly identify the commit which causes the biggest slowdown for me between the 1.5.1 tag and 1.6.0 RC1 I simply refuse to believe that the result of my analysis is correct. On 5045ac124e24ed1fe02be86a10f7f212a4dc everything is fine, on 96f5b5bdcae44ccc69e33d701e6188dc2570dadf things are slow. And no, I am not running into the exception. I can only guess that there is some error on my side. I do not think, the slowdown I reported based upon this program should be no reason to delay 1.6.0. (Even though I'd still like to understand what's going on.) Best, stefan -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: namespace dependency
thanks, that got me on the right track. it turns out that clojure.tools.namespace.dir/scan can do this. The reason I couldn't see the dependencies I was looking for was because I had managed to write (ns .. (require ...)) instead of (ns ... (:require ...)) in the files I was looking at. This caused the declaration parsing to miss the referred namespaces. Cheers Dave On Saturday, 22 March 2014 01:11:53 UTC+11, cjeris wrote: You might take a look at Tim McCormack's Nephila visualizer: https://github.com/timmc/nephila On Fri, Mar 21, 2014 at 6:33 AM, Dave Sann dave...@gmail.comjavascript: wrote: Assuming a set of directories/classpath, is there a simple way to determine the set of namespaces that are dependent on another namespace? in this case, by dependent I mean (for example): A refers B B refers C D dependents of B are A dependents of C are B and A dependents of D are B and A dependents of A are nothing. I had a look at tools.namespace but I didn't see an easy way to do this. Maybe I missed it. Thanks Dave -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clo...@googlegroups.comjavascript: Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+u...@googlegroups.com javascript: For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+u...@googlegroups.com javascript:. For more options, visit https://groups.google.com/d/optout. -- Chris Jeris cje...@brightcove.com javascript: freenode/twitter/github: ystael -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
Re: [ANN] Clojure 1.6.0-RC2
Working fine for me with core.matrix latest build. On Saturday, 22 March 2014 10:46:22 UTC+8, Alex Miller wrote: Clojure 1.6.0-RC2 is now available. Try it via - Download: http://central.maven.org/maven2/org/clojure/clojure/1.6.0-RC2 - Leiningen: [org.clojure/clojure 1.6.0-RC2] See the full change log here: https://github.com/clojure/clojure/blob/master/changes.md Clojure 1.6.0-RC2 has the following changes since 1.6.0-RC1: - String hasheq calculation has changed so it can leverage cached String hashCode - [CLJ-1387] reduce-kv on large hash maps ignores reduced result Please let us know how it looks - we would like to make this 1.6.0 final. Alex -- You received this message because you are subscribed to the Google Groups Clojure group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en --- You received this message because you are subscribed to the Google Groups Clojure group. To unsubscribe from this group and stop receiving emails from it, send an email to clojure+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
