Map eats println output?
Hi, When I run this expression: (map (fn [x] (println x) x) (range 5)) I expect to get (0 1 2 3 4) but instead I get (0 1 2 3 4 0 1 2 3 4) It seems like the println output is included in the result list. Am I missing something? -- 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: Map eats println output?
When I run this expression: (map (fn [x] (println x) x) (range 5)) I expect to get (0 1 2 3 4) but instead I get (0 1 2 3 4 0 1 2 3 4) It seems like the println output is included in the result list. Am I missing something? The REPL is fooling you. (def *x (map (fn [x] (println x) x) (range 5))) ;= user/*x (count *x) ;= 5 (map identity *x) ;= (0 1 2 3 4) Regards, BG -- Baishampayan Ghose b.ghose at gmail.com -- 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: Map eats println output?
That's a big relieve. Thanks for the answer! -- 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
when quotes and when syntax-quotes?
Hi,
I am reading Joy of Clojure, there is the following sample in 8.1.1:
(defn contextual-eval [ctx expr]
(eval
`(let [~@(mapcat (fn [[k v]] [k `'~v]) ctx)]
~expr)))
And the sample output:
(contextual-eval {'a 1, 'b 2} '(+ a b))
;= 3
(contextual-eval {'a 1, 'b 2} '(let [b 1000] (+ a b)))
;= 1001
I do not understand why `'~v has be to used this way. If I used `~v instead
(that is, remove the quote), it still works. So my question is, why ~v needs
to be first quoted and then syntax-quoted?
Thanks for your help!
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Re: ClojureScript Mobile BOF at the Clojure/conj?
This seems interesting, if there's not a BOF let's meet informally anyway ! On Mon, Oct 17, 2011 at 1:40 AM, Frank Siebenlist frank.siebenl...@gmail.com wrote: Is there any interest to organize some form of ClojureScript Mobile BOF at the Clojure/conj? (some informal, ad hoc get-together where developers can share experiences and show-off some of their work related to making ClojureScript work on the mobile devices) The only thing we would need is an available meeting place after the official track is finished for the day with ideally a projector and enough interested folks… Anyone from the Clojure/conj org committee who could comment on the desirability and feasibility? I'd be happy to volunteer to help if needed. Thanks, FrankS. PS. Personally, I'm currently having a lot of fun with ClojureScript+Sencha-Touch+PhoneGap, and my company (most probably) will use that for commercial product development soon. ClojureScript is still somewhat raw and rough, though, and the ability to share experiences f2f with fellow-victims would be very much appreciated. -- 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 -- Federico Brubacher @fbru02 -- 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 Mobile BOF at the Clojure/conj?
The hotel bar may be a good backup venue ;-) On Oct 17, 2011, at 9:17 AM, Federico Brubacher wrote: This seems interesting, if there's not a BOF let's meet informally anyway ! On Mon, Oct 17, 2011 at 1:40 AM, Frank Siebenlist frank.siebenl...@gmail.com wrote: Is there any interest to organize some form of ClojureScript Mobile BOF at the Clojure/conj? (some informal, ad hoc get-together where developers can share experiences and show-off some of their work related to making ClojureScript work on the mobile devices) The only thing we would need is an available meeting place after the official track is finished for the day with ideally a projector and enough interested folks… Anyone from the Clojure/conj org committee who could comment on the desirability and feasibility? I'd be happy to volunteer to help if needed. Thanks, FrankS. PS. Personally, I'm currently having a lot of fun with ClojureScript+Sencha-Touch+PhoneGap, and my company (most probably) will use that for commercial product development soon. ClojureScript is still somewhat raw and rough, though, and the ability to share experiences f2f with fellow-victims would be very much appreciated. -- 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 -- Federico Brubacher @fbru02 -- 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
Is there a reader setting support BigDecimal by default?
In some versions of Scheme or Lisp, there is a flag that you can set so that the reader will create exact numbers by default (BigDecimal) instead of inexact doubles. Is there a way to do this in Clojure? Scott Hickey -- 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: when quotes and when syntax-quotes?
Guofeng Zhang guof...@radvision.com writes:
I do not understand why `'~v has be to used this way. If I used
`~v instead (that is, remove the quote), it still works. So my
question is, why ~v needs to be first quoted and then syntax-quoted?
I'm not the most experienced Clojure programmer, but I'll have a go:
The key is to count the levels of quoting, and make sure they match what
you need at each level for each form. Using just `~ is (almost) a
no-op. Putting ' in between them yields the a form containing the
quoted *value* of v, which is equivalent to the (possibly clearer)
`(quote ~v). The quoting comes into play for symbols, because quoting
captures any symbols as literal symbol objects vs whatever they resolve
to in the lexical scope. If you pass {'a 'one} in for the ctx argument
to contextual-eval as-is, then the symbol `one' ends up quoted in the
generated let, and `a' properly bound to the symbol object. If you
modify the function to *not* quote the value, then an unquoted `one' get
inserted instead, and the function throws an error because `one' is
unbound.
HTH,
-Marshall
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Re: when quotes and when syntax-quotes?
On Mon, 2011-10-17 at 04:32 +, Guofeng Zhang wrote:
`(let [~@(mapcat (fn [[k v]] [k `'~v]) ctx)]
And the sample output:
(contextual-eval {'a 1, 'b 2} '(+ a b))
I do not understand why `'~v has be to used this way. If I used `~v
instead (that is, remove the quote), it still works. So my question is, why
~v needs to be first quoted and then syntax-quoted?
It appears to work the same in both of your samples because the numbers,
e.g. 1 and 2, are self-evaluating.
Try (contextual-eval '{a (+), b (1 2)} '(concat a b)) to see the
difference. (Hint: it should yield (+ 1 2), literally.)
--
Stephen Compall
^aCollection allSatisfy: [:each|aCondition]: less is better
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Re: when quotes and when syntax-quotes?
On Oct 17, 12:50 pm, Marshall T. Vandegrift llas...@gmail.com wrote: Guofeng Zhang guof...@radvision.com writes: I do not understand why `'~v has be to used this way. If I used `~v instead (that is, remove the quote), it still works. So my question is, why ~v needs to be first quoted and then syntax-quoted? I'm not the most experienced Clojure programmer, but I'll have a go: The key is to count the levels of quoting, and make sure they match what you need at each level for each form. Using just `~ is (almost) a no-op. Not just almost, but actually. -- 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: Is there a reader setting support BigDecimal by default?
Hi, you are looking for 1.3M? 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
Re: Is there a reader setting support BigDecimal by default?
I've been using 1.2 but I would be OK with a solution in any version. Scott Hickey -- 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: Is there a reader setting support BigDecimal by default?
Hi, I meant this: Clojure 1.2.0 user= (type 1.0M) java.math.BigDecimal 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
Get the name of keyword/symbol in clojurescript
Hi, As I understand it, clojurescript uses some unicode characters to identify keywords/symbols. I guess that's why (str 'a) gives me ï·‘'a I thought that this was intentional, and that (name 'a) would give me a, but I got the same result as with (str). So how do I extract the name from a symbol or keyword in clojurescript? Also, is this behavior intentional, and if so, why? -- 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: Get the name of keyword/symbol in clojurescript
Are you using ClojureScript HEAD? If you are and you are still seeing this under what conditions (advanced mode, browser REPL, etc.) ? David On Mon, Oct 17, 2011 at 6:41 PM, Jonathan Fischer Friberg odysso...@gmail.com wrote: Hi, As I understand it, clojurescript uses some unicode characters to identify keywords/symbols. I guess that's why (str 'a) gives me ï·‘'a I thought that this was intentional, and that (name 'a) would give me a, but I got the same result as with (str). So how do I extract the name from a symbol or keyword in clojurescript? Also, is this behavior intentional, and if so, why? -- 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
trouble setting up emacs
I am trying to follow the directions at http://dev.clojure.org/display/doc/Getting+Started+with+Emacs. 1. I want to install the Emacs Starter Kit. The directions at http://dev.clojure.org/display/doc/Getting+Started+with+Emacs mention GNU Emacs 23 or 24 is recommended, however https://github.com/technomancy/emacs-starter-kit says You'll need Emacs 24. The directions say precompiled versions are readily available for Debian-based systems I'm using a Debian based system. so I went to http://emacs.naquadah.org/. a. I executed wget -q -O - http://emacs.naquadah.org/key.gpg | sudo apt-key add - b. I'm now confused as to which version I want: Stable? If so I should then follow the directions to add 2 lines to /etc/apt/sources.list, and then what do I do? 2. Once I get emacs 24 installed, the directions sort of leave off with In both cases, you need to launch a Clojure instance with the correct classpath settings. This is most commonly done using a build tool such as Leiningen. For instructions see the Build Tools section of Getting Started. Going to http://dev.clojure.org/display/doc/Getting+Started and perusing the Build Tools doesn't explain how to setup and launch a Clojure instance. I see some explanations at http://blog.bensmann.com/setting-up-a-clojure-development-environment but don't know if that includes some obsolete directions. thanks, -Bruce -- 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: trouble setting up emacs
On Mon, Oct 17, 2011 at 8:32 PM, Bruce Gordon brucebgor...@gmail.com wrote: I am trying to follow the directions at http://dev.clojure.org/display/doc/Getting+Started+with+Emacs. 1. I want to install the Emacs Starter Kit. The directions at http://dev.clojure.org/display/doc/Getting+Started+with+Emacs mention GNU Emacs 23 or 24 is recommended, however https://github.com/technomancy/emacs-starter-kit says You'll need Emacs 24. Emacs 23 or newer is needed for Clojure support. Emacs 24 is needed for the Starter Kit. I'm using a Debian based system. so I went to http://emacs.naquadah.org/. a. I executed wget -q -O - http://emacs.naquadah.org/key.gpg | sudo apt-key add - b. I'm now confused as to which version I want: Stable? If so I should then follow the directions to add 2 lines to /etc/apt/sources.list, and then what do I do? That page lists a number of packages all starting with emacs-snapshot. So if you want to use the terminal version only, try emacs-snapshot-nox; if you want a debug build, emacs-snapshot-dbg, etc. 2. Once I get emacs 24 installed, the directions sort of leave off with In both cases, you need to launch a Clojure instance with the correct classpath settings. This is most commonly done using a build tool such as Leiningen. For instructions see the Build Tools section of Getting Started. The next section labeled Slime and Swank Clojure links to the readme for swank-clojure, which explains how to use M-x clojure-jack-in; the simplest way to get a slime session going. It should probably be cleaned up a bit since it's accumulated some cruft over the months, but it's all correct. -Phil -- 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
Presented 'Introduction to Clojure' at Silicon Valley Code Camp on October 8th
Hi, I had the honor of doing a presentation on 'Introduction to Clojure' at Silicon Valley Code Camp on October 8th. It was the first presentation on Clojure at SVCC http://www.siliconvalley-codecamp.com/Sessions.aspx. The importance to Clojure could be felt being given the first time slot of the two day camp. My slide deck is posted at http://www.slideshare.net/theceo/introduction-to-clojure-9639369 . Hope people find it useful and hope I have not made any glaring mistakes. Please feel free to check it out. Happy programming clojure, Abbas -- 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
