Re: [ANN][Book] Clojure Recipes published and for sale on Amazon
Thanks everyone. On Thursday, 22 October 2015 22:52:25 UTC+11, Torsten Uhlmann wrote: > > Congratulations, Julian! > > Leonardo Borges <leonardo...@gmail.com > schrieb am Do., 22. > Okt. 2015 um 13:10 Uhr: > >> Congratulations Julian! I'll share this around! >> >> On Thu, Oct 22, 2015 at 9:51 PM Julian <julian...@gmail.com > >> wrote: >> >>> My book Clojure Recipes just got published and is for sale on Amazon! >>> http://clojurerecipes.net/ >>> >>> http://www.amazon.com/Clojure-Recipes-Developers-Library-Julian/dp/0321927737/ >>> >>> I've been working on it for about 2.5 years - I hope you find it useful! >>> (Or even better - I hope you know a friend that might find it useful.) >>> >>> A little context in the form of Q below. >>> >>> Cheers >>> Julian >>> >>> *Q* >>> *Haven't we got enough Clojure books already?* >>> I asked this of Stuart Sierra when he was in down under 2 years ago. He >>> responded "we have enough 'introduction to Clojure books' but there is room >>> for other types of books". >>> >>> *Who is it for?* >>> This is a book for people who 'learn by doing'. It's for that guy in the >>> office who is interested in Clojure, and wants to use it to hack on a >>> project this weekend. (The assumption is you're familiar with Lisp-style >>> parens, but not much more.) >>> >>> The book contains 'starter projects' for various use-cases of a >>> small-to-medium size - it will hold your hand enough to get you started, >>> and then free you up to take your project as you choose. Each one is >>> self-contained, and assumes little Clojure knowledge, and explains the code >>> as you go. >>> >>> *What? Clojure Recipes? Isn't there already a Clojure book in this >>> format?* >>> I signed the contract in December 2012 with Pearson. At that time there >>> wasn't a Clojure book in this genre. >>> >>> Then Ryan Neufeld announced he was writing a Clojure book in 2013. I got >>> in touch with Ryan and Justin Gehtland about the situation. They were both >>> amazingly generous and supportive, and clarified they could see differences >>> in the books intended purpose and content. I caught up with Ryan last year >>> at the Clojure Conj and he was warm and encouraging. >>> >>> I came away feeling really positive about the Clojure community. >>> Everyone wants to 'grow the pie' of involved people. >>> >>> -- >>> 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.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.
[ANN][Book] Clojure Recipes published and for sale on Amazon
My book Clojure Recipes just got published and is for sale on Amazon! http://clojurerecipes.net/ http://www.amazon.com/Clojure-Recipes-Developers-Library-Julian/dp/0321927737/ I've been working on it for about 2.5 years - I hope you find it useful! (Or even better - I hope you know a friend that might find it useful.) A little context in the form of Q below. Cheers Julian *Q* *Haven't we got enough Clojure books already?* I asked this of Stuart Sierra when he was in down under 2 years ago. He responded "we have enough 'introduction to Clojure books' but there is room for other types of books". *Who is it for?* This is a book for people who 'learn by doing'. It's for that guy in the office who is interested in Clojure, and wants to use it to hack on a project this weekend. (The assumption is you're familiar with Lisp-style parens, but not much more.) The book contains 'starter projects' for various use-cases of a small-to-medium size - it will hold your hand enough to get you started, and then free you up to take your project as you choose. Each one is self-contained, and assumes little Clojure knowledge, and explains the code as you go. *What? Clojure Recipes? Isn't there already a Clojure book in this format?* I signed the contract in December 2012 with Pearson. At that time there wasn't a Clojure book in this genre. Then Ryan Neufeld announced he was writing a Clojure book in 2013. I got in touch with Ryan and Justin Gehtland about the situation. They were both amazingly generous and supportive, and clarified they could see differences in the books intended purpose and content. I caught up with Ryan last year at the Clojure Conj and he was warm and encouraging. I came away feeling really positive about the Clojure community. Everyone wants to 'grow the pie' of involved people. -- 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: sort-by reverse order?
That's awesome! (though I'm slightly surprised there isn't an easier way). Thanks. On Tuesday, 23 November 2010 21:03:37 UTC, Tyler Perkins wrote: Nice! And with just a bit more, we have a clean, sorting DSL: (def asc compare) (def desc #(compare %2 %1)) ;; compare-by generates a Comparator: (defn compare-by [ key-cmp-pairs] (fn [x y] (loop [[k cmp more] key-cmp-pairs] (let [result (cmp (k x) (k y))] (if (and (zero? result) more) (recur more) result) (sort (compare-by :last-name asc, :date-of-birth desc) coll) -- 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] async-sockets - work with sockets using core.async channels
Hi Zach, Thanks for the clarity of thought that went into this post. Perhaps it is obvious to everyone but me, but I saw this post by Christophe Grande yesterday that appears to address these concerns: Back-pressurized interop for core.async https://twitter.com/cgrand/status/520566182194450432 https://gist.github.com/cgrand/767673242b7f7c27f35a I'm interested to hear if this solves your problem or is about something else. Cheers Julian On Wednesday, 8 October 2014 17:00:02 UTC+11, Zach Tellman wrote: The reason the thread-per-connection approach is nice is because it correctly propagates backpressure. If we're copying data from a source to a sink (let's say reading it in from the network and writing to a file), it's possible that the production of data may outstrip the consumption. If this happens, we need to make sure the producer slows down, or we risk running out of memory. In Java, the producer is typically connected to the consumer via a blocking queue, and if the queue fills up the producer can't send anything more to the consumer. A Java socket is one such queue, and if it fills up it will exert backpressure via TCP. This will work no matter how many queues or other mechanisms separate the producer and consumer. However, every attempt I've seen to marry core.async to an async network stack has been fundamentally broken, in that it doesn't do this. Often, they'll just use 'put!', which works fine until the channel's queue fills up, and 1024 pending puts are accumulated, and finally the channel throws an exception. Alternately, they'll use a blocking put on the channel, which means that any backpressure will also extend to whatever other connections are sharing that thread or the thread pool. Note that the software that uses core.async in this way may work flawlessly in a wide variety of cases, but there's still an intractable failure mode lying in wait. In some cases, such as http-kit's websocket mechanism, there's no way to even exert backpressure (you register a callback, and have no way to indicate in your callback that you can't handle more messages). This means that any attempt to use http-kit in conjunction with core.async will be subtly but fundamentally broken. Arguably, even without core.async in the equation it's broken. This is not a good state of affairs. I'll admit that it took me a few failures in production to realize how important correct handling of backpressure is, but this isn't something that our ecosystem can afford to ignore, especially as Clojure is used for larger-scale projects. I will note that I am working on a solution to this, in the form of the upcoming Aleph release [1]. This will model every network connection via streams that can trivially be converted into core.async channels [2], and which exert backpressure over TCP wherever necessary without requiring a thread per connection. A formal beta should be available in the near future (it's already handling billions of requests a day in production without issue). Zach [1] https://github.com/ztellman/aleph/tree/0.4.0 [2] https://github.com/ztellman/manifold On Tuesday, October 7, 2014 1:36:16 PM UTC-7, adrian...@mail.yu.edu wrote: It's not about 'safety' (depending on what that means in this context), but as Zach pointed out, if you aren't careful about backpressure you can run into performance bottlenecks with unrestrained async IO operations because although they let you code as if you could handle an unlimited amount of connections, obviously that isn't true. There is only a finite amount of data that can be buffered in and out of any network according to its hardware. When you don't regulate that, your system will end up spending an inordinate amount of time compensating for this. You don't need to worry about this with regular io because the thread per connection abstraction effectively bounds your activity within the acceptable physical constraints of the server. On Tuesday, October 7, 2014 2:49:30 PM UTC-4, Brian Guthrie wrote: On Mon, Oct 6, 2014 at 12:10 AM, adrian...@mail.yu.edu wrote: Zach makes an excellent point; I've used AsyncSocketChannels and its irk ( http://docs.oracle.com/javase/8/docs/api/java/nio/channels/AsynchronousServerSocketChannel.html), with core.async in the past. Perhaps replacing your direct java.net.Sockets with nio classes that can be given CompletionHandlers ( http://docs.oracle.com/javase/7/docs/api/java/nio/channels/CompletionHandler.html) would be a better fit. Once I do some performance instrumentation I'll give that a shot. I admit that I'm not familiar with all the implications of using the nio classes; were I to switch, is it safe to continue using go blocks, or is it worth explicitly allocating a single thread per socket? Brian -- You received this message because you are subscribed to the Google Groups
in Clojure I rarely find myself reaching for something like the state monad, as I would in Haskell
A quick shoutout to the Clojure Community - thanks for the way you've all contributed to make my life (mentally) richer. James Reeves (author of Compojure and many other wonderful libraries) made this interesting comment on Hacker News: Clojure has libraries that implement monads, but these aren't often used for threading state. I can't quite place my finger on why, but in Clojure I rarely find myself reaching for something like the state monad, as I would in Haskell. Clojure tends to view mutability as a concurrency problem, and the tools it provides to deal with mutability, such as atoms, refs, agents, channels and so forth, are not mechanisms to avoid mutation, as to provide various guarantees that restrict it in some fashion. It might be that in the cases where I'd use a state monad in Haskell, in Clojure I might instead use an atom. They're in no way equivalent, but they have some overlapping use-cases. https://news.ycombinator.com/item?id=7751424 My question is - have other Clojure/Haskell programmers had this experience? (ie I rarely find myself reaching for something like the state monad). I'm interested to hear if so, and why. JG PS If this post is unhelpful, could be worded better - please let me know. I'm asking out of curiosity, not with intent to troll. -- 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.
My Clojure Workflow, Reloaded
Stuart Sierra has written a fantastic article on his particular pattern for writing and testing Clojure code: http://thinkrelevance.com/blog/2013/06/04/clojure-workflow-reloaded There is some commentary on Hacker News about it here: https://news.ycombinator.com/item?id=5819487 I'll include some of the salient points Therefore, after every significant code change, I want to restart the application from scratch. But I don't want to restart the JVM and reload all my Clojure code in order to do it: that takes too long and is too disruptive to my workflow. Instead, I want to design my application in such a way that I can quickly shut it down, discard any transient state it might have built up, start it again, and return to a similar state. And when I say quickly, I mean that the whole process should take less than a second. To achieve this goal, I make the application itself into a transient object. Instead of the application being a singleton tied to a JVM process, I write code to construct instances of my application, possibly many of them within one JVM. Each time I make a change, I discard the old instance and construct a new one. The technique is similar to dealing with virtual machines in a cloud environment: rather than try to transition a VM from an old state to a new state, we simply discard the old one and spin up a new one. My questions to the fantastic hacker new communities are: (1) Have you used this technique on your project? (2) What is your experiences using this technique? (3) Stuart hints that particular projects have to be structured to be able to better use this technique - can you point to a particular project that is well suited to this? -- -- 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/groups/opt_out.
Re: asm-based clojure yet?
One more thought on the broader ideas of LISPy languages and ASM. One of the versions of Crash Bandicoot was developed in Game Oriented Assembly LISP (GOAL) - which was a common LISP DSL that generated assembler. I recalled this today because Michael Fogus tweeted about it: https://twitter.com/fogus/status/336865798628966400 If you're a hobbyist dabbling in this space then you might find reading about it interesting and inspiring: http://en.wikipedia.org/wiki/Game_Oriented_Assembly_Lisp http://all-things-andy-gavin.com/2011/03/12/making-crash-bandicoot-gool-part-9/ JG On Sunday, 19 May 2013 01:49:43 UTC+10, Gary Trakhman wrote: It's hard to really appreciate java and clojure until you actually write some C/C++ or ASM.. I have some minor experience with that stuff, and it still haunts me from time to time. Sometimes we make tradeoffs without knowing we did. By choosing a language, or having the choice made for us, we accept a set of abstractions as our bottom level of thinking for a problem-space. Only old-timers and people that make a point to care about low-level stuff will notice the implications of what they're doing along the abstraction stack. People with ingrained habits just won't find it easy to think functionally, but I'm young and irreverent, so it doesn't bother me :-). C++ is fun because of all the bolted-on kludges that 'mitigate' these problems. You can use operator-overloading on pointer operations to perform automatic reference counting, deallocating objects when things that point to them go out of scope, but I think implementing a PersistentHashMap this way would be very difficult. Also, pretty sure it can't handle cycles. I guess the point is, I appreciate any effort to understand such issues, it's been a useful thing for me to know in the 0.05% of time that knowledge is needed. But, people who don't know just won't be able to get past those problems. And, you generally can't easily find a _really_ full-stack guy to glance at it for you when it would be useful to have one. On Sat, May 18, 2013 at 11:24 AM, atkaaz atk...@gmail.com javascript:wrote: your comment caused me to be reading this http://prog21.dadgum.com/134.html (at least) On Sat, May 18, 2013 at 6:17 PM, Gary Trakhman gary.t...@gmail.comjavascript: wrote: Immutability, persistence, closures without a serious garbage collector sounds hard. On Sat, May 18, 2013 at 1:09 AM, atkaaz atk...@gmail.com javascript:wrote: Thanks very much everyone! I'm looking into all of those, but currently planning to read Julian's pdf. I didn't want to say anything until I had something definite, but just letting y'all know that I'm considering each recommendation. On Sat, May 18, 2013 at 7:12 AM, Julian julian...@gmail.comjavascript: wrote: If you had a hobbyist interest in representing S-expressions in assembler - then you could take a look at the tutorial written by Abdulaziz Ghuloum called Compilers: Backend to Frontend and Back to Front Again. It used to be available here: http://www.cs.indiana.edu/~aghuloum/compilers-tutorial-2006-09-16.pdf I don't know if it available anywhere else on the internet - but I grabbed another copy and put it here: https://sites.google.com/site/juliangamble/Home/Compilers%20Tutorial%202006-09-16.pdf?attredirects=0d=1 For a more serious representation of Clojure's persistent data structures, I don't recommend trying to implement them in ASM. Cheers Julian On Friday, 17 May 2013 22:06:45 UTC+10, Alan D. Salewski wrote: On Fri, May 17, 2013 at 02:10:02PM +0300, atkaaz spake thus: Ok, weird question: is there some clojure port on assembler yet? Even if(/especially if) it doesn't have jvm/java/javalibs support Or should I just check https://github.com/clojure/**clojure-clrhttps://github.com/clojure/clojure-clr? I'm mainly interested in low memory footprint and fast startup times (does clojure-clr have that?) You may want to check out ClojureScript, too. ClojureScript programs leveraging nodejs for host interop have fast startup times: https://github.com/clojure/**clojurescript/wikihttps://github.com/clojure/clojurescript/wiki -- --**--**- a l a n d. s a l e w s k i sale...@att.net 1024D/FA2C3588 EDFA 195F EDF1 0933 1002 6396 7C92 5CB3 FA2C 3588 --**--**- -- -- 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
Re: asm-based clojure yet?
If you had a hobbyist interest in representing S-expressions in assembler - then you could take a look at the tutorial written by Abdulaziz Ghuloum called Compilers: Backend to Frontend and Back to Front Again. It used to be available here: http://www.cs.indiana.edu/~aghuloum/compilers-tutorial-2006-09-16.pdf I don't know if it available anywhere else on the internet - but I grabbed another copy and put it here: https://sites.google.com/site/juliangamble/Home/Compilers%20Tutorial%202006-09-16.pdf?attredirects=0d=1 For a more serious representation of Clojure's persistent data structures, I don't recommend trying to implement them in ASM. Cheers Julian On Friday, 17 May 2013 22:06:45 UTC+10, Alan D. Salewski wrote: On Fri, May 17, 2013 at 02:10:02PM +0300, atkaaz spake thus: Ok, weird question: is there some clojure port on assembler yet? Even if(/especially if) it doesn't have jvm/java/javalibs support Or should I just check https://github.com/clojure/clojure-clr ? I'm mainly interested in low memory footprint and fast startup times (does clojure-clr have that?) You may want to check out ClojureScript, too. ClojureScript programs leveraging nodejs for host interop have fast startup times: https://github.com/clojure/clojurescript/wiki -- - a l a n d. s a l e w s k i sale...@att.netjavascript: 1024D/FA2C3588 EDFA 195F EDF1 0933 1002 6396 7C92 5CB3 FA2C 3588 - -- -- 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/groups/opt_out.
Re: How to speed up Clojure Training for New Recruitment
Thanks Jay, Those articles are indeed inspirational. I was just wondering - back from your TW days - would the arguments in those articles make sense for a TW consultant to present to a client? Cheers, Julian On Tuesday, 19 June 2012 01:22:34 UTC+10, Jay Fields wrote: learning curve, and training time be reduced for new recruits ? Also how do you pitch it to the management ? I'd read this for inspiration on how to talk to mgmt. Perhaps I'd even suggest they read it. http://www.paulgraham.com/avg.html Related: http://www.paulgraham.com/icad.html Cheers, Jay -- 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
Re: algebra system core.logic
Core.logic isn't the only way to approach this problem. In Peter Norvig's PAIP he included a simple algebra system, macsyma http://norvig.com/paip/macsyma.lisp (in common lisp). JG On Sunday, 20 May 2012 06:21:56 UTC+10, Brent Millare wrote: That's more or less what I'm going to have to do anyways. It's great that clojure + core.logic make that as easy as possible. On Friday, May 18, 2012 10:42:16 PM UTC-4, David Nolen wrote: It might also be interesting to pursue a hybrid system - that's the whole point of core.logic - being able to mix functional and relational programming with minimal hassle. 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
Re: Rich Hickey Video - unit conversion language
Awesome - I wonder if Frinj was what Rich had in mind when he was giving that talk? On Sunday, 4 March 2012 19:08:36 UTC+11, martintrojer wrote: And now there is Frinj! :) https://github.com/martintrojer/frinj On Monday, 21 June 2010 12:46:55 UTC+1, Julian wrote: Rich Hickey made reference in one of his videos to a language that could convert between all different kinds of units and dimensions. Does anybody recall what that was? -- 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
clj-blueprints
I'd like to present you with an small library for working with Blueprints-enabled graph databases in Clojure: https://github.com/eduardoejp/clj-blueprints Have fun! -- 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
Re: Debugging Java heap space memory error with lazy sequences.
Thanks! To confirm my understanding: in my original version I defined (using def) a reference to a lazy sequence. I then evaluated it, using nth to pick a value from the sequence. Because I have a reference to the beginning of the sequence all the lazily generated items are retained. I.e. the lazy sequence is lazy only for the first time it works through the sequence instance, if there is a live reference to the sequence then those now generated elements remain, (to avoid the overhead of regenerating them?). By providing a function to return a new instance of the sequence each time, as in the solution Meikel has provided, I avoid retaining any references to the front of the sequence, and the garbage collector can do it's work. I always learn much better by making mistakes like these. Cheers, Julian. On Thu, Nov 17, 2011 at 9:49 PM, Meikel Brandmeyer m...@kotka.de wrote: Hi, this is a “hold unto head” problem. Am 17.11.2011 um 15:06 schrieb Julian Kelsey: (def seq-3s-n-5s (filter (fn [n] (or (= 0 (mod n 5)) (= 0 (mod n 3)) ) ) (iterate inc 1))) Here you keep a reference to the head of the generated by iterate. Make it a function: (defn seq-3s-n-5s [] (filter #(or (zero? (mod % 5)) (zero? (mod % 3))) (iterate inc 1))) Then call it like this: (nth (sums (seq-3s-n-5s 0) (Math/pow 10 6)) That should fix your problem. Sincerely Meikel -- 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 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
Debugging Java heap space memory error with lazy sequences.
I was working on a few of the Project Euler puzzles. The first involves picking the nth element from a particular series, (sum the numbers factored either by 3 or 5 below 1000). One forum comment on the very first puzzle raised the criticism that it's easy to solve the question as presented (i.e. below 1000), but what if you wanted the sum below 10^18? I started working towards the big number goal using lazy sequences. First, a lazy sequence of numbers that are factored by 3 or 5. Second, another lazy sequence such that the nth element is the sum of the first n elements of the input sequence. Finally, pick the nth element, (it doesn't quite match the question, but it's of similar complexity): (def seq-3s-n-5s (filter (fn [n] (or (= 0 (mod n 5)) (= 0 (mod n 3)) ) ) (iterate inc 1))) (defn sums [coll n] (lazy-seq (when-let [s (seq coll)] (let [x (+ n (first s))] (cons x (sums (rest s) x)) (nth (sums seq-3s-n-5s 0) (Math/pow 10 6)) However some where between (Math/pow 10 6) and (Math/pow 10 7) It throws an error: java.lang.OutOfMemoryError: Java heap space. I'm wondering if I'm crossing some threshold into a different number type? Or perhaps I've missed some point and got the lazy sequence stuff wrong? So my question has two parts: (1) How can I fix this code so that it will run to further into the sequence? (2) What actually has gone wrong? How could you debug something like this? Notes: we can trust that (nth seq N) is not the problem, it returns in reasonable time for a test like this: (nth (iterate inc 1) (Math/pow 10 9)) Cheers, Julian Kelsey. -- 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
Re: Homoiconicity in clojure (macro power)
There are some examples of homoiconicity in other languages here: http://c2.com/cgi/wiki?HomoiconicExampleInManyProgrammingLanguages (being TCL, Joy and Io) Also worth noting is the recent work by Ola Bini on Ioke. Another interesting homoiconic language was Apple's Dylan language - which transitioned from leading parentheses and prefix expressions (both S-Expressions) to infix expressions and a more C-like syntax: http://en.wikipedia.org/wiki/History_of_the_Dylan_programming_language#The_roots_of_changing_the_syntax_from_lisp_way_to_an_infix_one I wonder what would be required for a modification to the clojure reader in order to do this... -- 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
Re: Homoiconicity in clojure (macro power)
Julian julian...@gmail.com writes: I wonder what would be required for a modification to the clojure reader in order to do this... No intention of picking on Julian, but do we really have to re-live all of the flamewars and jawflapping of comp.lang.lisp on the clojure group again? You're giving me flashbacks 8^) My apologies, my intention was to provide a thinking scenario, rather than troll for a flamewar. If that's the probable outcome then let's drop it, and make a mature decision to focus on something else. Cheers to the Clojure community. JG -- 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
Clojure binding for OrientDB
I have been working on this library for a little while and I would like to present it to you: https://github.com/eduardoejp/clj-orient I hope this can be of help for the Clojure and OrientDB communities. -- 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
Re: [Clojurescript] Any of this in the pipeline?
These were the four major features which first got me interested in GWT: * tooling in GWT - being able to debug compiled javascript step by step whilst working in an eclipse java debugger is what stood out for me (and seemed to help it scale to large applications) I've got stacks of respect for Rich Hickey and the work his team has put into this - and the community that has sprung up around Clojure. My question is intended to be about opportunities and next steps for the community. My question is this: What are the missing 'pieces of the puzzle' - that would allow this kind of GWT-style, IDE-integrated debugging of large scale apps in ClojureScript? (I'm aware debugging and stack traces could be better in Clojure generally - I was asking about the other hooks and components.) -- 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
Re: A stupid jvm question
You might want to check this out: https://github.com/tinkerpop/tinkubator/tree/master/mutant -- 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
clj-ripple
I made a little library called clj-ripple for the easy embedding of Ripple code (for navigating the Semantic Web) inside Clojure programs. It works by translating Clojure sexps to Ripple code strings through a macro and then executes and returns the resulting stacks as lazy sequences. The git repo can be found here: https://github.com/eduardoejp/clj-ripple To include it in your projects, add this to your leiningen deps: [clj- ripple 0.1.0-SNAPSHOT] For more info about the Ripple scripting language, please visit the following links: * http://ripple.fortytwo.net/ * http://ripple.googlecode.com/svn/trunk/docs/screencast/index.html * https://github.com/joshsh/ripple/wiki Happy crawling! -- 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
Re: Cyber Dungeon Quest Alpha 1
I looked at this and thought, It reminds me of Wyvern. The lead developer behind Wyvern, Steve Yegge, was a fairly visionary and expressive programmer who has written a lot about LISP and JVM related subjects. I was reminded of Steve Yegge's post on when he thought he'd rewrite Wyvern to reduce the number of lines of code, and decided the best way to do it would be to use LISP, but ended up settling on Mozilla Rhino (javascript/ecmascript). http://steve-yegge.blogspot.com/2007/12/codes-worst-enemy.html It feels like lots of Steve's visionary posts are making an appearance in the amazing Clojure community. JG On Apr 14, 10:03 pm, Wei Hsu yayits...@gmail.com wrote: Very cool! I really enjoyed playing it. On Apr 14, 12:20 pm, Alan a...@malloys.org wrote: Similar error for me, on Ubuntu. Exception and wrapped exception follow. Looks like you may need permissions set better? 403 is Forbidden. com.sun.deploy.net.FailedDownloadException: Unable to load resource:http://sappler.ls4.allbytes.de/resatori/webstart/cdq.jnlp at com.sun.deploy.net.DownloadEngine.actionDownload(DownloadEngine.java: 1372) at com.sun.deploy.net.DownloadEngine.getCacheEntry(DownloadEngine.java: 1525) at com.sun.deploy.net.DownloadEngine.getCacheEntry(DownloadEngine.java: 1503) at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(DownloadEngine.java : 1609) at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(DownloadEngine.java : 1534) at com.sun.deploy.net.DownloadEngine.getResource(DownloadEngine.java: 217) at com.sun.deploy.net.DownloadEngine.getResource(DownloadEngine.java: 201) at com.sun.javaws.Launcher.updateFinalLaunchDesc(Launcher.java:469) at com.sun.javaws.Launcher.prepareToLaunch(Launcher.java:248) at com.sun.javaws.Launcher.prepareToLaunch(Launcher.java:199) at com.sun.javaws.Launcher.launch(Launcher.java:116) at com.sun.javaws.Main.launchApp(Main.java:416) at com.sun.javaws.Main.continueInSecureThread(Main.java:248) at com.sun.javaws.Main$1.run(Main.java:110) at java.lang.Thread.run(Thread.java:662) java.io.IOException: Server returned HTTP response code: 403 for URL:http://sappler.ls4.allbytes.de/resatori/webstart/cdq.jnlp at sun.reflect.GeneratedConstructorAccessor1.newInstance(Unknown Source) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstru ctorAccessorImpl.java: 27) at java.lang.reflect.Constructor.newInstance(Constructor.java:513) at sun.net.www.protocol.http.HttpURLConnection $6.run(HttpURLConnection.java:1491) at java.security.AccessController.doPrivileged(Native Method) at sun.net.www.protocol.http.HttpURLConnection.getChainedException(HttpURLConnec... 1485) at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection 1139) at com.sun.deploy.net.BasicHttpRequest.doRequest(BasicHttpRequest.java: 229) at com.sun.deploy.net.BasicHttpRequest.doRequest(BasicHttpRequest.java: 113) at com.sun.deploy.net.BasicHttpRequest.doGetRequest(BasicHttpRequest.java: 78) at com.sun.deploy.net.DownloadEngine.actionDownload(DownloadEngine.java: 1182) at com.sun.deploy.net.DownloadEngine.getCacheEntry(DownloadEngine.java: 1525) at com.sun.deploy.net.DownloadEngine.getCacheEntry(DownloadEngine.java: 1503) at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(DownloadEngine.java : 1609) at com.sun.deploy.net.DownloadEngine.getResourceCacheEntry(DownloadEngine.java : 1534) at com.sun.deploy.net.DownloadEngine.getResource(DownloadEngine.java: 217) at com.sun.deploy.net.DownloadEngine.getResource(DownloadEngine.java: 201) at com.sun.javaws.Launcher.updateFinalLaunchDesc(Launcher.java:469) at com.sun.javaws.Launcher.prepareToLaunch(Launcher.java:248) at com.sun.javaws.Launcher.prepareToLaunch(Launcher.java:199) at com.sun.javaws.Launcher.launch(Launcher.java:116) at com.sun.javaws.Main.launchApp(Main.java:416) at com.sun.javaws.Main.continueInSecureThread(Main.java:248) at com.sun.javaws.Main$1.run(Main.java:110) at java.lang.Thread.run(Thread.java:662) Caused by: java.io.IOException: Server returned HTTP response code: 403 for URL:http://sappler.ls4.allbytes.de/resatori/webstart/cdq.jnlp at sun.net.www.protocol.http.HttpURLConnection.getInputStream(HttpURLConnection 1436) at java.net.HttpURLConnection.getResponseCode(HttpURLConnection.java: 379) at com.sun.deploy.net.BasicHttpRequest.doRequest(BasicHttpRequest.java: 190) ... 17 more On Apr 14, 12:03 pm, mark skilbeck
VerifyError trouble
Hi guys. I was working on a macro for easily defining mutable classes without having to previously define a protocol for the methods in them (the macro takes care of that for you) and providing basic get-set operations. However, I have trouble when defining classes, cause I get the following error: java.lang.VerifyError: (class: x/y/Z, method: clinit signature: ()V) Incompatible argument to function You can check out the code here: https://gist.github.com/800813 I'm using Clojure 1.2 on this one. Am I doing something wrong or is this a bug in Clojure? I think the problem comes when I add the metadata to the variables in the class. BTW: The switch macro that appears there is my version of 'case' and it works mostly the same. -- 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
Re: VerifyError trouble
I think I have the same error as in this post: http://groups.google.com/group/clojure/browse_thread/thread/8257e4ec8a652b23/e94df8077ecb1ac4 -- 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
Why is DISsoc being DIScriminated?
I noticed that although you can use assoc with sequences and vectors to modify them, you could not use dissoc to eliminate elements from them. Why is this so? -- 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
OrientDB
Hey guys, I know it's not directly related to Clojure, but I'm in a start-up with some friends and I'll be working on a website that would seriously benefit from graph DBs. I've checked out Neo4J (and found it quite nice), but OrientDB also seems really cool and it sports a more flexible license (plus it seems to be better when it comes to scalability). However, there ain't much info about it outside the company's website. Has anyone of you ever used it? If so, what has been your experience with it? P.S: In case I choose to use it, you can count on me open-sourcing a Clojure lib for it, :P -- 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
Symbol evaluation error in let
user= (let [a 'b] (str a)) b user= (let [b 5 a 'b] (eval a)) java.lang.Exception: Unable to resolve symbol: b in this context (repl-1:7) user= (let [a 'b b 5] (eval a)) java.lang.Exception: Unable to resolve symbol: b in this context (repl-1:9) user= (def b 5) #'user/b user= (def a 'b) #'user/a user= a b userr= (eval a) 5 How come this problem happens inside the let but not with def? -- 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
Re: Symbol evaluation error in let
Woah. That's as weird as you can get. Thanks, man. -- 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
Can clojure.contrib.fnmap.PersistentFnMap have metadata
I was trying to use the fnmap API at clojure.contrib for some things and I needed to add metadata to the function maps but I got this exception: java.lang.ClassCastException: clojure.contrib.fnmap.PersistentFnMap cannot be cast to clojure.lang.IObj Stuart, can you make PersistentFnMa extend IObject or is it not possible for some reason? -- 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
Re: Understanding clojure bindings
You might wanna check out the post I recently made and the answer by Ken Wesson: http://groups.google.com/group/clojure/browse_thread/thread/9b042a2ddb8017aa It's basically the same thing. -- 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
Re: precise numbers
For the sake of comparison with other LISPs - some Scheme implementations have an exact? function for dealing with non-precise numbers. This seems not to have come across to Clojure. (Although we do have ratios and BigInteger). JG -- 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
Re: Little LISPer and Ten Commandments
I concur - that book is amazing. Steve Yegge mentions he worked through the whole book in Scheme and then Common LISP. http://steve-yegge.blogspot.com/2006/06/shiny-and-new-emacs-22.html (and he mentioned recently he was taking a look at Clojure.) It looks like there is a blog or two online that work through it. There also appear to be some guys on twitter talking about it. My favourite bit is how you build the scheme evaluator at the end. JG On Sep 23, 6:10 am, David Sletten da...@bosatsu.net wrote: That book is amazing. Enjoy working through it, it will stretch your mind. However, keep in mind that their emphasis is on getting a feel for how recursion works. Real world Clojure code (any Lisp really) de-emphasizes recursion to some extent. Particularly with regard to list (sequence) processing (the name Lisp comes from List processing after all), Clojure has a powerful library of functions that handle much of what the book implements recursively. For example, if you would like to apply a function f to each element in a list you could write code similar to the book: (defn my-map [f l] (cond (empty? l) '() :else (cons (f (first l)) (my-map f (rest l ) (my-map inc '(1 2 3 4 5)) = (2 3 4 5 6) Here we apply the First Commandment--is the list l empty? If so, return an empty list. Otherwise, apply the function to the first element of the list and recursively process the rest of the list. We could accomplish the same thing more succinctly in Clojure like this: (map inc '(1 2 3 4 5)) = (2 3 4 5 6) Clojure has a built-in 'map' function which iterates over each element in a sequence, not merely lists: (map dec [2 4 6 8]) = (1 3 5 7) (map #(Character/toUpperCase %) Is this not pung?) = (\I \S \space \T \H \I \S \space \N \O \T \space \P \U \N \G \?) Furthermore, the book is pretty much using a dialect of Lisp called Scheme, and the semantics are a little different from Clojure. For instance, Clojure does not have the concept of 'atom'. It may actually be easier to work through the book in a Scheme environment (I used Common Lisp though). But what you learn there will help you later with Clojure. In fact, if you are brave here is some of the material from chapter 9 dealing with the Y-Combinator implemented in Clojure. It's pretty weird:http://groups.google.com/group/clojure/browse_thread/thread/c9bd4e79e... Have all good days, David Sletten On Sep 21, 2010, at 6:38 PM, ax2groin wrote: Newbie here, to both LISP and Clojure. A friend has lent me a copy of The Little LISPer and I've started working through it, using some web resources to translate it into clojure. My questions: How relevant are the ten commandments? What modification need to be made ... either to the commandments or to your code in clojure? I ask because the first commandment (always ask null?) hasn't translated directly into any single statement for me. I can achieve the same with (or) to navigate the difference between nil and () in clojure, but sure that difference is in there for a reason. Any other input on the other commandments or using the book in general? Thanx -- 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 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
maturity and usefulness: clj-haml vs haml-macro
I'm about to start a new project using haml in clojure and I wanted to know at the present time (Jun 2010) - is clj-haml or haml-macro more mature? -- 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
Rich Hickey Video - unit conversion language
Rich Hickey made reference in one of his videos to a language that could convert between all different kinds of units and dimensions. Does anybody recall what that was? -- 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
Problem: Multimethod Dispatch Function
I'm working on an object system called Fenrir, and one of the
functions in my library, called new-obj, is used to make instances of
classes:
(defmulti new-obj #(:_fenrir_class-name %))
(defmethod new-obj ::fObject [fclass kvals]
(with-meta (apply struct-map (conj kvals (:_fenrir_struct fclass)))
{:_fenrir_class (:_fenrir_class-name fclass)}))
In fObject, the class which all other classes extend, I have
implemented the basic mechanisms for setting slots in struct-objects.
However, when I call the multimethod with something like this:
(new-obj fGameObject :location 'a-loc :sprite 'a-sprite)
I get this error:
1:14 yggdrasil.fenrir.core= java.lang.IllegalArgumentException: Wrong
number of args passed to: core$fn (repl-1:13)
That sort of thing has also happened to me with other multimethods I'm
working on.
Could anybody help me?
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Re: Full Disclojure - I Need Topics!
+1 for debugging 2010/1/27 Joonas Pulakka joonas.pula...@gmail.com On Jan 27, 7:17 am, Mark Engelberg mark.engelb...@gmail.com wrote: Topic idea: What is the most elegant way to write a GUI in Clojure? (Swing? JavaFX?) Any great contrib libraries that make GUI programming noticeably easier? I have to mention MiGLayout (http://www.miglayout.com/) and its Clojure wrapper (http://richhickey.github.com/clojure-contrib/ #miglayout http://richhickey.github.com/clojure-contrib/%0A#miglayout). Without MiGLayout, doing Swing GUIs is horrible. With it, it's fun! Best Regards, Joonas -- 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.comclojure%2bunsubscr...@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 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
Matt Raible: Why is Clojure better than Scala or Groovy?
Matt Raible - Spring Expert and Java consultant posted the following entry to Twitter: Why is Clojure better than Scala or Groovy? http://twitter.com/mraible/status/7793457551 He went on to say: Let's try that again: I like Scala and Groovy and see no compelling reason to learn Clojure. Am I missing something? http://twitter.com/mraible/status/7794565786 I know that I think - but I thought the awesome community here could help answer this question. -- 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
Re: Clojure + Redis
Oops, typo - I meant, doesn't have hashes. On Jan 1, 9:07 pm, Julian Morrison julian.morri...@gmail.com wrote: It doesn't have sets exactly - just keys and values. -- 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
Re: If you wish to have a version for off-line use...
Did you mean this? http://clojure.googlegroups.com/web/manual.pdf On Sep 20, 4:59 am, cej38 junkerme...@gmail.com wrote: I was just looking through the main web page of clojure-contrib and came across this: If you wish to have a version for off-line use you can use the download button on the page at GitHub .gh-pages branch. Is there a similar repository for the clojure.org? --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
Re: Newbie question: Writing a GUI with clojure
On Aug 6, 6:51 am, Joe Van Dyk joevan...@gmail.com wrote: You wouldn't want to whip up a quick example (or blog post) for me, would ya? Taking a quick look in the files section of this group found this: http://clojure.googlegroups.com/web/clojure-gui-and-netbeans.pdf?hl=engda=f1jT-U4AAAC-wnUK1KQ919yJcmM1ACuZF_7r2-2rkSjhF_gc_N1Bbpenpc0tTgTfOT8mbP3D_UHFOPRGngYCB6zi_choflON47Cl1bPl-23V2XOW7kn5sQ =) JG --~--~-~--~~~---~--~~ 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 -~--~~~~--~~--~--~---
neo4j-clojure
A wrapper for neo4j, which is a non-relational database using a network of nodes with properties and traversable relationships. This is my first Clojure wrapper library, I've tried to keep the spirit of Clojure by only wrapping things that were verbose or un- lispy. Please comment and critique. Patches welcome. http://github.com/JulianMorrison/neo4j-clojure/tree/master --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
Re: neo4j-clojure
Not papers, but... http://en.wikipedia.org/wiki/Network_database http://en.wikipedia.org/wiki/Navigational_database Neo4j is basically a really old design refreshed. The advantages are that it's fast, dynamic, and schema-free, and fairly lispy in its inherently recursive structure. The disadvantages are that it's messy, can't be joined but only traversed (this is bad especially for data mining and reporting), is hard to data dump, and at the moment neo4j runs in-process with no multi-user access. On Dec 6, 10:09 pm, jim [EMAIL PROTECTED] wrote: Hey, I was just looking at neo4j last night. Can you point me to any papers about the theory behind those kinds of a databases? Thanks, Jim On Dec 6, 3:15 pm, Julian Morrison [EMAIL PROTECTED] wrote: A wrapper for neo4j, which is a non-relational database using a network of nodes with properties and traversable relationships. This is my first Clojure wrapper library, I've tried to keep the spirit of Clojure by only wrapping things that were verbose or un- lispy. Please comment and critique. Patches welcome. http://github.com/JulianMorrison/neo4j-clojure/tree/master --~--~-~--~~~---~--~~ 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 To unsubscribe from this group, send email to [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/clojure?hl=en -~--~~~~--~~--~--~---
