Clojure is num.19 at GitHub

• Google analytics with #Clojure and #Incanter (here, via @liebke) — Another illustrative article on how to create instant applications with Clojure from nakkaya.com: Pull data from Google Analytics and then process it and show it in nice graphs with Incanter.
• Next week (3/11) is “Happy Tasty Clojure” from Kurt Christensen (here, via @jasonbock) — If you are near the Twin Cities by 3/11, there is a talk on Clojure hosted by the Twin Cities Languages User Group

That’s it? Yes. Slow day today. You guys must be having working a lot instead of tweeting!

user=> (macroexpand-all '(->r c (+ _ 32) (* 1.8 _)))
(* 1.8 (+ c 32))

• Want to play with a clojure CLR REPL and don’t want to compile it yourself? I’ve made a crude installer (here, via @paulbatum) — Clicking the link will prompt your browser to download said installer. I have not tested it, since I do not have a Windows machine.
• I just released some updates to CLJENV. If you didn’t know, it’s like virtualenv for Clojure (here, via @offbytwo) — Lets you work (on Unix) with different Clojure environments, and be able to switch between them easily. “CLJENV includes clojure and contrib 1.1, slime, clojure-mode and swank-clojure. Also, a clojure script that does what you expect.”
• rewrote clojure-json encoder using clojure 1.2 protocols, more than 2x speedup for same functionality. Yay! (via @danlarkin) — Great anecdotal evidence that that the new protocol addition was a good decision.
• Mu: Google AI Challenge in Clojure (here, via @jneira) — Google sponsors an AI Challenge with the University of Waterloo to create the smartest ‘tron’ player. The author provides a clojure version of the ’starter-package’ that Google has made available for the challengers. Below is a video of a few ‘tron’ AI players playing. Happy hacking!!!

Want to meet-up with fellow Clojurers/istas/ians? Here are the new options announced this weekend:

• Mon Feb 7th @ 7pm in Singapore: slides ready, now to practice a few times & go over the code before Monday (here, via @mmazur)
• Wed Feb 10th @ 7.30pm in Amsterdam: Amsterdam Clojurians: Meetup next Wednesday? (here, via @neotyk)
• Thu Feb 11th @ 7pm in Seattle, WA: Seattle Clojure meeting will be on the 11th (Thurs) at 7pm at U-district @zokacoffee.  Swing on by! (here, via @technomancy)

All is not lost though; here it is the catch of the day:

• New Event National Capital Area Clojure Users Group February Meetup (here, via @dctechevents) — If you’re around Reston, VA on February 18, don’t miss out on this meetup!
• Just posted a set on installing #clojure on #windows (here, via @fulldisclojure) — If you are a Clojure newbie, this is for you! Sean Devlin (@fulldisclojure) has published a series of short screencasts on installing Clojure on Windows in the following ways: command-line only, Netbeans+Enclojure, Eclipse+counterclockwise and  ClojureBox. Don’t miss out on the background music while you’re watching the videos…
• Blogged about list-comprehension (here, via @LauJensen) — Following the structure of a recent article on Scala’s ‘for’ construct as a way to perform list comprehension, Lau Jensen has attempted to provide the same functionality in Clojure. The proposed Clojure versions of the Scala snippets seem overall simpler.

; simple recursive evaluator
(defn arithmetic [lst]
  (match lst
    v  :when (number? v)  v
    [ _ "error" _]     "error"
    [ _ _ "error"]     "error"
    [ "add" a b ]      (+ (arithmetic a) (arithmetic b))
    [ "sub" a b ]      (- (arithmetic a) (arithmetic b))
    [ "mul" a b ]      (* (arithmetic a) (arithmetic b))
    [ "div" a b ]      (/ (arithmetic a) (arithmetic b))
    [ "squared" a ]    (arithmetic ["mul" (arithmetic a) (arithmetic a)])
    _                  "error" ))

• Scala, JRuby, Groovy, Clojure: JVM-Sprachen mit Potenzial (here, via@JAXenter_News) — The readers of JAX enter magazine in Germany have voted about which JVM-based languages have most potential. The tally is Scala (31%), JRuby (26%), Groovy (19%) and Clojure (15%). The rest of the languages are far behind, the next one being Jython at 3%.
• Cool, a talk on the #clojure programming language next tuesday evening in Berlin (here, via @pholdings) — If you are near Berlin next Tuesday Feb 2nd, there is a clojure talk there in the Berlin Lispers Meetup (see link for details)
• la #clojure plugin for #intellij 9.0.1 is now available! (via @wmacgyver) — Finally!
• My latest project is on github: Rincanter: R, Clojure, Incanter in the same REPL (here, via @jolby) — From the author: “Rincanter is a clojure/incanter wrapper around the rosuda JRIEngine Java/R bridge. The hope is to allow easy access to an embedded R engine from incanter. It also offers translation between clojure/incanter datatypes and R datatypes such as R dataframe to incanter dataset.”
• Nice, there’s webmachine-esque and content-negotiation libs for compojure already (via @chrishouser) — Nice to see how the Compojure ecosystem is growing :)
• Philly’s Emerging Technologies for the Enterprise Conference just added: Case Study in Using #Clojure #AMQP #Chef #Cucumber #JRuby (here, via @jennrapp) — The talk sounds interesting. There is also a talk from Rich Hickey himself “Clojure’s Approach to State and Identity” :)
• Rewrote #clojure contrib.json again with Protocols (here, via @stuartsierra) — Good to see the new features of Clojure 1.2 being used!
• New little blog post: The Joy of Clojure, my perspective (here, via @chrishouser) — Why “The Joy of Clojure” is a different book? Because the book is not about programming in Clojure, but about Clojure the language. Just like how “On Lisp” relates to Common Lisp.
• Episode 9 is up (here, via @fulldisclojure) — Sean Devlin’s new screencast explains why the parenthesis in any lisp are such a key part of the language. For that he explores how in Clojure, code is data, and so a Clojure program is just an elaborate data structure. Use this video to convince your friends!

By the way, you can still buy the alpha e-books of  ”Clojure in Action” and “The Joy of Clojure” at a 40% discount with the code “f440″. The purchase of the alpha e-book gives you rights to own the final book, so don’t hesitate!