Scala Watch

[勉強会] Asakusa Scala DSL デザインレビューの勉強会
@asami224 の浅海さんが、現在サンプルベースで、Asakusa DSLのScala版をプロトタイピングで作成されています。可能であれば、集まって、そのデザイン・レビューをしようという話になりました。
[Liftweb] The Simply Lift REST chapter
http://stable.simply.liftweb.net/#cha:HTTP-and-REST
[scala-user] Interesting discussion about Scala "FUD"
http://www.theserverside.com/news/thread.tss?thread_id=62010

[scala-announce] specs2 1.0 (http://specs2.org)
[scala-user] How to extend visibility in an instance creation expression?
class C { protected def x = 1 }
val c = new C { override def x = 2 }
c.x // <<<<----error?
val cd = { class CD extends C { override def x = 2 }; new CD }
In summary, if you want to widen a protected in a class you need to create a named subclass. An anonymous class won't do.
[Liftweb] Flot widget: New support for zoom and pan
http://www.flickr.com/photos/dcbriccetti/5490828593/
http://talkingpuffin.org/tpuf/

[scala-user] Nick Kallen (of Twitter) in a Scala interview
http://www.infoq.com/interviews/kallen-scala-twitter
[scala-announce] Scala IO 0.1.1 released
I found two critical bugs with 0.1.0 so I have made a quick patch release to fix the issue.
[scala-user] Reader Monad + Writer Monad [Slides]
Here are some slides from a talk at Brisbane Functional Programming Group on Monday night (28 Feb) using Scala.
Configuration Without the Bugs and Gymnastics
Logging Without Side-effects
[lift-committers] Getting starting with some Flot improvements
I am ready to start enhancing the Flot widget. I want the zoom/pan feature for TalkingPuffin.

[勉強会] Scala勉強会横浜
[scala-user] [ANN]VTD-XML 2.10
VTD-XML is the next generation XML parser/indexer/editor/slicer/assembler/xpath-engine that goes beyond DOM, SAX and PULL in performance, memory usage, and ease of use.
[scala-user] ANN: Borachio - native scala mocking
Homepage: http://borachio.com/
GitHub: https://github.com/paulbutcher/borachio
Documentation: http://borachio.com/api/com/borachio/package.html

[scala-internals] o/~ You... slice up my life... o/~
Investigating the behavior shown above led me to discover there are 25 concrete implementations of "slice" in the collections.

[Liftweb] Fun and games with SHtml.idMemoize
http://lift.la/shtmlidmemoize-simple-ajax-updating
[Liftweb] The return of controllers?
I read Harryh's slides from nescala (https://docs.google.com/present/view?id=dcbpz3ck_38cj3kdbgm) ...
I have for years secretly suspected that parameterized Loc's are in fact controllers. ....
With Menu.param(...) and the new Menu.params(...), you can build parameterized, type-safe Locs very easily and with HarryH's favorite snippet feature: parameterized snippets.
[Twitter] @wfaler: Bowler #Scala Web Framework 0.2 Has been released! http://bit.ly/i8W1N3
[scala-user] Northeast Scala Symposium talks
http://www.nescala.org/2011/

[scala-internals] Re: Dynamic { def applyIfNotDefined(...) }
So the idea is that, if `obj` not have a method `name`, but `obj`s type inherits from Dynamic, then
obj.name(args) is interpreted as obj.applyDynamic("name", args).
[scala-ide-dev] Commnets from Martin Odersky
http://alarmingdevelopment.org/?p=562#comment-58901
I just wanted to say that my company Scala Solutions has taken the over development of the Eclipse IDE for Scala....
I have now switched for all of my development work to our as yet unreleased version of the Scala plugin for Eclipse....
[scala-user] ANN: Routineer - a DSL for HTTP routes
Ticket #1133: nested extractors generate exponential-space bytecode
[Liftweb] A new integrated way to develop Lift apps with jEdit
http://www.screencast.com/users/Adagioklez/folders/Jing/media/c46075bf-3486-4680-a8d3-402cc7ad8fcd

[Scala Trac] Changeset 24311
re-enabled case classes in package objects

[勉強会] Scala勉強会第25回 in 渋谷
[scala-user] ANN: Akka 1.0 final released
[scala-user] Re: the power of types
Using Church encoding for vectors/arrays and matrices would allow what the Unreal people would like to see in a new mainstream language: www.unreal.com/Downloads/Slides/Tim-POPL.ppt

[scala-internals] JNA for Scala?
I had it working if somewhat clunkily, with fuse filesystems successfully written in scala.
https://github.com/paulp/jna-fuse-scala
[scala-internals] compiler: undercover(aged)
I got scct running on the compiler. Here is the report from the compiler about the compiler after compiling itself.
http://paulp.github.com/scct/scalac-coverage-report/

[ny-scala] Up and Running with Simple Build Tool
[Liftweb] Possible Lift Training at Skills Matter in London in March
I'm going to be in London in March and am considering offering Lift training. It'd be a one day course covering Lift Basics, REST, and Comet/Ajax. The price will be around £1,000 per student.
[scala-language] About foldRight
It infers from left to right and doesn't go back across parameter list boundaries to change its mind.
scala> def f1[T](x: T)(xs: Set[T]) = xs + x
f1: [T](x: T)(xs: Set[T])scala.collection.
immutable.Set[T]
scala> f1("a")(Set(new AnyRef))
<console>:7: error: type mismatch;
found : java.lang.Object
required: java.lang.String
f1("a")(Set(new AnyRef))
^
scala> def f2[T](x: T, xs: Set[T]) = xs + x
f2: [T](x: T,xs: Set[T])scala.collection.immutable.Set[T]
scala> f2("a", Set(new AnyRef))
res1: scala.collection.immutable.Set[java.lang.Object] = Set(java.lang.Object@26bb2f6e, a)

[Liftweb] First material result of running Lift with JRuby
Basically, Lift can dispatch snippets to JRuby and take the result from JRuby as a hash that's converted into a CSS Selector Transform.
https://github.com/lift/liftjr

[scala-language] Naming of Dynamic#invokeDynamic Method
Using type Dynamic it's possible to write a DynamicProxy that can call every Java object dynamically. On JDK7, the invokeDynamic method would be implemented with a invokeDynamic instruction, so in that sense the method name is right on spot. On the other hand, a DSL would implement invokeDynamic with something different.
[Liftweb] removing an attribute with CSS Selector Transforms
val blank: Option[String] = None
"#thing [class]" #> blank
[twitter] @odersky: 3000+ #Scala questions on #stackoverflow. It was only last April that the 1000th question was asked. Talk about acceleration...
[playframework] 1.1.1 released and 1.2 plans
The scala module is a separated project. But it looks like the data access component is almost ready, and I now need to check it and to update the sample applications and documentation.
[Scala Trac] #3890 Illegal cyclic reference in code using Jsoup
FYI, it seems the author of jsoup has changed the code, and the reported problem will not appear on the latest jsoup version, anymore. https://github.com/jhy/jsoup/issues/closed#issue/54
[scala-user] Announce: Akka 1.0-RC6 released

[勉強会] Scala勉強会第22回 in 渋谷
[scala-announce] ScalaQuery 0.9.1 released
http://scalaquery.org
[Liftweb] How to use CSS transforms for this use case?
<div class="lift:ASnippet"><ul><li> Item </li></ul></div>
def render = {
val aList = List("A","B","C")
val idList = List("a1", "b2, "c3")
"li" #> aList.zip(idList).map{ case (a, id) => "* *" #> a & "* [id]" #> id}
}
[twitter] @scalagwt: An amazing thing has happened, and Grzegorz has screenshots: http://goo.gl/xlzt6 I bet the Scala+GWT dance is euro-cool.
[scala-internals] new motivation for applyIfDefined

[Liftweb] Qwhispr -- New launched service that uses Lift
http://www.qwhispr.com
[twitter] @ijuma: Start getting ready for Scala 2.9.0, "I can't give precise dates, but it's more in the order of weeks, than months" http://goo.gl/oXI3n
[blog] Janx Spirit: A Quick WebApp with Scala, MongoDB, Scalatra and Casbah

[Liftweb] [ANN] reactive-web
Reactive-web is new RIA framework, making it easy to write highly interactive web applications, similar to GWT, Flex, etc. It uses the Functional Reactive Programming library reactive, and requires Lift.
http://github.com/nafg/reactive

[scala] Scala 3D powered by Java 3D
The ScalaCanvas3D API, the ImScalaSwing API which provides additional Scala Swing Components, and all 3D sample programs are now compiled against Scala 2.8.1.
http://www.interactivemesh.org/testspace/j3dmeetsscala.html
[scala-user] ANN: Akka 1.0-RC5 released
[Liftweb] Rogue: A Type-Safe Scala DSL for querying MongoDB
http://engineering.foursquare.com/2011/01/21/rogue-a-type-safe-scala-dsl-for-querying-mongodb/

[scala-lang.org] Scala levels: beginner to expert, application programmer to library designer
[Liftweb] The Loyal Opposition
[Scala-Trac] Changeset 23993
Dynamic type added.
http://pastie.org/1468102
[twitter] @jorgeoritz85: Love seeing cool Scala projects like this: BlueEyes, a purely async Scala framework for writing REST services http://t.co/bS7n2wn

[Liftweb] Clarification on CSS "^^" modifier
<div><span id="a">howdy</span><div id="b">dude</div></div>
"#a ^^" #> "ignore" & "* *" #> "hello" // <span id="a">hello</span>
"#b ^^" #> "ignore" & "* [style]" #> "woof" // <div style="woof">dude</div>

[Liftweb] Financial enterprise app in Lift
[Liftweb-review] Issue 796 -- add a lift attribute for snippets
[Scala-Trac] Changeset 28967
Imported sbt.Process into trunk, in the guise of package scala.sys.process. It is largely indistinguishable from the version in sbt, at least from the outside.

[勉強会] Scala勉強会第20回 in 渋谷
[LSUG] FREE TALK: How Guardian (mostly) moved from Java to Scala
[scala] Swarm and Continuations plugin
I've recently been approached by a well-funded organization who are interested in making my Swarm proposal a reality so that they can use it in a large software project they are working on (which will be implemented in Scala AFAIK).
[Liftweb] It's a polyglot world after all

[scala] Lots of juice CUFP videos now available online
http://cufp.org/news/2011/cufp-2010-videos-now-available-online
[scala] ERC grant for supporting parallel DSLs in Scala
http://www.scala-lang.org/node/8579
[playframework] Re: Enterprise Application Development w/ Scala
The main problem currently is the Hibernate component that doesn't match with Scala. That's why we are working on a new data access component before rewriting the sample applications, updating the
tutorial, completing the documentation and releasing a dedicated website.

[Liftweb] comet performance across servlet containers
Currently, Lift support Jetty6 by default and Jetty7 can be enabled by changing a LiftRule setting in Boot.scala.
The following ticket: https://www.assembla.com/spaces/liftweb/tickets/719-full-support-for-continuations-in-servlet-3-0 will be implemented before Lift 2.3-M1 and will enable automatic detection of Jetty6/Jetty7/Servelet 3.0 (Tomcat 7 and Glassfish) for its comet support.
[scala-user] Another sbaz GUI
http://code.google.com/p/another-sbaz-gui/
[Liftweb] Basic Lift training video
http://tunaforcats.com/2011-01-04_Lift_Basics.wmv
http://vimeo.com/groups/75631
[勉強会] Scala勉強会第19回 in 渋谷

[Liftweb] Web Sockets support in Lift
I want to publicly reiterate that Lift will support web sockets for Comet transport and other features in Lift. However, we're going to wait until the web sockets protocol and API is closer to standardization and maturity.
[Advent Calendar] Scala Advent Calendar jp 2010
[Day 5] papamitra: Scala+Android小ネタ集

[勉強会] Scala勉強会第15回 in 渋谷
[scala] ANN: scalaxb 0.5.1 is released
http://scalaxb.org
[scala-user] Re: Default value in constructor
it looks like the spec agrees: from the SLS 2.8 (Nov 9th 2010) section 6.3: asInstanceOf[T ] returns the “null” object itself if T conforms to scala.AnyRef, and throws a NullPointerException otherwise.
http://lampsvn.epfl.ch/trac/scala/ticket/1245 "null.asInstanceOf[T] doesn't follow spec"
[Advent Calendar] Scala Advent Calendar jp 2010
[Day 2] xuwei: scalaの予約語

[skilmatter] Martin Odersky's Object-oriented meets functional: An exploration of Scala
[skilmatter] SCALA - PERFORMANCE IMPROVEMENTS OF A FACTOR OF 4 TO 30, BOXING AND SPECIALIZATION
[scala-internals] Re: Optional implicits in Scala?
scala> implicit def OptionalImplicit[A <: AnyRef](implicit a: A = null) = Option(a)
scala> implicitly[Option[Ordering[Int]]]
res0: Option[Ordering[Int]] = Some(scala.math.Ordering$Int$@1443628)
scala> implicitly[Option[Ordering[Any]]]
res1: Option[Ordering[Any]] = None

[勉強会] Scala for Android 勉強会 in 神奈川工科大学
大学関係者のみでお願いします
[scala-announce] CFP: The Second Scala Workshop - Scala Days 2011
[scala-user] Re: Structural types/reflection
val x = new { def foo = 5 }; x.foo Could some day be optimized to not use reflection?
https://lampsvn.epfl.ch/trac/scala/ticket/3974
https://lampsvn.epfl.ch/trac/scala/ticket/3975
[Liftweb] Re: Bug in snippet dispatch?
Lift will only dispatch methods by convention (reflection) if the method was declared on the snippet class itself. I made this decision early in Lift's life because of security concerns around accidentally dispatching to methods.
[Liftweb] Simply Lift: HTML is Live
http://simply.liftweb.net/
[Scala Trac] Changeset 23678
def collectFirst[B](pf: PartialFunction[A, B]): Option[B]
def maxBy[B](f: A => B)(implicit cmp: Ordering[B]): A
def minBy[B](f: A => B)(implicit cmp: Ordering[B]): A
def span(p: A => Boolean): (Iterator[A], Iterator[A])
def inits: Iterator[Repr]
def tails: Iterator[Repr]
def unzip3[A1, A2, A3](implicit asTriple: A => (A1, A2, A3)): (CC[A1], CC[A2], CC[A3])
def permutations: Iterator[Repr]

[scala] Re: Compiler internals/Compiler plugin: tree.tpe != Symbol tpe
scala> :power
scala> import global._
scala> atPhase(currentRun.typerPhase)(definitions.ListModule.tpe)
scala> atPhase(currentRun.typerPhase)(definitions.ListModule.tpe.narrow)
[Liftweb] Lift 2.2 release countdown
[Liftweb] CSS Selector class replacement
".comment [class+]" #> post.id
[Liftweb] Using the <head> tag in HTML5 templates
The HTML5 parser does not allow you to put a <head> tag anywhere except as the first tag under the <html> tag. If you need a to use Lift's <head> tag merging feature (e.g., your template requires an additional script or style tag in the head), please use <lift:head>.

[scala-tools] Re: any Visual Studio extenders out there?
(1) maintain a single codebase written in Scala with JDK dependencies; yet
(2) have a bootstrapping Scala.NET compiler (ie., the Scala.NET compiler being able to compile its own sources on .NET, which means those sources should rely on .NET APIs)
The bridge between (1) and (2) is provided by jdk2ikvm[pdf]
[scala-user] Re: Default value in constructor
class Field[T](val name: String, var value: T = null.asInstanceOf[T])
[scala-user] Re: Multiple implicit arg lists
scala> def f(implicit i: Int) = "dingus"
f: (implicit i: Int)java.lang.String
scala> 1 to 3 map { implicit x => f } mkString
res0: String = dingusdingusdingus
[twitter] @jamesiry: James Gosling likes Scala and hates JSF. He and I agree about two things. http://youtu.be/9ei-rbULWoA
[Liftweb] Wiring, the most powerful feature in Lift (or any other web framework), ever
Wiring will make it super-simple to define relationships among components on the page and automatically update those components based on user actions.
http://demo.liftweb.net/invoice_wiring
http://demo.liftweb.net/simple_wiring

[scala-lang.org] What's new in Scala 2.8: Actors API
Scala Actors API overview
[twitter] @pk11: NYSE is using #scala in production #nyscala

[NYSE] Be Thankful for Short Scala Talks
[scala-user] Implicit parameters: Why does this compile?
object ID {
  implicit val ordering = new Ordering[ID] {
   override def compare(id1: ID, id2: ID) = id1.value - id2.value
  }

}
case class ID(value: Int)
object Main {
  def main(args: Array[String]) {
   val ids = List(ID(1), ID(2), ID(3))
   println(ids.max)

  }
}
It looks in the companion object of any "associated type" of the one it's looking at.
[scala-internals] Design of a new Eclipse Scala debugger
Iulian Dragos and I (and probably others!) are starting a project to create a new Scala debugger for Eclipse.

[scala-user] scala.collection.Graph – Preliminary
http://www.tip-top-tipp.info/scala-graph/Quick-Start.pdf
http://www.tip-top-tipp.info/scala-graph/doc/
[scala-user] autoboxing question
Since 2.9, Predef has defined implicit def Integer2int(x: java.lang.Integer): Int = x.intValue
[scala-lang.org] Scala Days 2011 — Call for Papers
Scala Days 2011 is coming, June 2-3 at Stanford University in California.
[lift-commiters] Cannot build dpp_issue_714
Since OS X uses HFS+ by default, the file system is case insensitive but case preserving [1]. The behavior is pretty much unlike Linux.
http://reviewboard.liftweb.net/r/508/diff/#index_header

[Liftweb] Scala Lift Off in 2011, London, UK
http://skillsmatter.com/event/java-jee/scala-lift-off-london-2010/zx-1219
[scala] Re: is PermGen lurking heavily in Scala ?
I have the following flags in my sbt file and have not run out of PermGen space:
java -Xmx1512M -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=256m
[Liftweb] HTML5 support
LiftRules.htmlProperties.default.set((r: Req) => new Html5Properties(r.userAgent))
[Liftweb] Re: How can I get the domain name of the application from within a cometActor
def sendCometActorMessage(theType: String, name: Box[String], msg: Any) {
[Liftweb] CSS Selector bindings and attributes
[Liftweb] CSS Selectors: Multiple classes on an element
https://github.com/lift/lift/commit/152b6d0687413a63d6a07e762050f266bf7d4592
[twitter] @hseeberger: Wow: Just learned that James Gosling is on the advisory board of #Scala Solutions.

[Liftweb] Re: Remove "expires" header
With the defaultHeaders set to return Nil, Lift sets the following headers in the servlet response:
setting header Content-Type to application/xhtml+xml; charset=utf-8

setting header Content-Length to 2981
setting header X-Lift-Version to 2.2-SNAPSHOT
I think it's Jetty that's inserting the "0" expires header.
[Liftweb] Simply Lift
... I decided to organize them into a book... Simply Lift. https://github.com/dpp/simply_lift

[scala-user] secrets of a build tool guy
scala> def f(xs: Int*) = xs.sum ; def f(xs: Seq[Int]) = xs.sum
<console>:5: error: double definition:
...
scala> def f(xs: Int*) = xs.sum ; def f(xs: => Seq[Int]) = xs.sum
http://stackoverflow.com/questions/3422336/how-can-i-differentiate-between-def-fooaxs-a-and-def-fooa-bxs-a-b

[conference] Devoxx2010
What's New in Scala 2.8?, Bill Venners
[Liftweb] Re: Need some information about the site foursquare.com developed using Lift on Scala..
[scala-internals] dupcheck
Did you ever want to dump Java 5 signatures from existing classfiles? Did you ever want to find duplicate methods/fields in a classfile?

[scala-user] Re: T <: Ordered[T] and Arrays
def sortThing[T <% Ordered[T] :Manifest] (a:T, b:T): Array[T] =
if (a<b) Array(a,b) else Array(b,a)
def sortThing2[T :Ordering :Manifest] (a:T, b:T): Array[T] =
if (implicitly[Ordering[T]].lt(a,b)) Array(a,b) else Array(b,a)
[scala-announce] [ANN] vscaladoc2_genjson 0.2
http://vscaladoc.alchim31.net

[scala-user] g8 Scala compiler plugin template
I quickly hacked together a g8 template for creating compiler plugins.
https://github.com/n8han/giter8#readme
[scala-announce] Scala 2.8.1 final
[勉強会] Scala勉強会第11回 in 渋谷
[Liftweb] Re: out of PermGen
dpp@cobra:~$ cat bin/sbt-jr
java -Xmx1512M -noverify -javaagent:/home/dpp/bin/
jrebel/jrebel.jar -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=256m -jar `dirname $0`/sbt-launcher.jar "$@"
[scala-debate] news about the .NET backend
http://scala-programming-language.1934581.n4.nabble.com/attachment/3034869/0/p1.png

[scala-internals] generalized catch blocks, now available
try body
catch handler
finally vanish
Where handler is potentially any expression which evaluates to a PartialFunction[Throwable, T] where T is the type of the body.
[scala-user] ANNOUNCE: Akka 1.0-M1 just hit the shelves!

[勉強会] Scalaを遊ぶ!会第3回
[勉強会] Scalaコップの会14杯目
[scala-internals] @conditional annotation now implemented
[scala-user] Scala course in Lausanne
[lift-commiters] [vscaladoc2] work in progress
vscaladoc2_genjson : extract api from scala source into json files (store under $HOME/.config/vscaladoc2/apis)
http://github.com/davidB/vscaladoc2_genjson
vscaladoc2_www : a webapp use to display api (html, json) and cross link reference support linking to external apidoc in Scaladoc, Scaladoc2, Javadoc2
http://github.com/davidB/vscaladoc2_www
http://vscaladoc.alchim31.net/
[lift-announce] Announcing Lift 2.2-M1
[Liftweb] Re: Good Emacs setup for Lift development?
Stock Emacs 23.2.1
ENSIME 0.3
js2-mode for JavaScript files
org-mode for taking notes
Scamacs, so I get sbt recompile (if I want it) on each save
[lift-announce] Countdown to Lift 2.2
We are targeting to release 2.2-final on Wednesday January 5th, 2011.

[LJC] CLOUD COMPUTING WITH SCALA AND GRIDGAIN
[勉強会] 札幌Scala勉強会09
[勉強会] Scala勉強会第１０回 in 渋谷
[scala-user] Re: Stupid newbie question #1
scala> def getAll[T:Manifest](seq: Seq[Any]): Seq[T] = seq collect {case e if manifest[T].erasure.isInstance(e) => e.asInstanceOf[T]}
getAll: [T](seq: Seq[Any])(implicit evidence$1: Manifest[T])Seq[T]

scala> getAll[Int](List(1, "2", 3, "4"))
res36: Seq[Int] = List()

[scala-announce] Scala 2.8.1 RC4
[scala-internals] SCala 2.8.1 RC4 - details
Please do test this new version, and let us know if you find any further regressions during the coming week. The plan is to publish the final 2.8.1 version right afterwards.
[liftweb] Re: Comet calling Javascript
class MyCometDude extends CometActor {
def render = Call("my_js_func", Helpers.randomString(20))
override def lowPriority = case s: String => partialUpdate(Call("my_js_func", s))
}
[liftweb] Lift degsinger friendly templates & CSS-style binding

[勉強会] 札幌Scala勉強会08
[勉強会] Scala勉強会第８回 in 渋谷
[勉強会] Scalaを遊ぶ!会第2回
[scala-user] Re: What's going on with Actors NIO/Google Summer of Code
http://github.com/stephentu/scala
http://www.cs.berkeley.edu/~sltu/gsoc-remote-actors-doc.pdf
http://stephen-tu.blogspot.com/2010/10/scala-remote-actors.html
[scala] Scala Solutions: Commercial Scala Support
[Liftweb] A new era in flexibility of ProtoUser
I've broken ProtoUser and CRUDify out from Mapper. They are now living in a separate package, lift-proto and they only depend on webkit.
[scala-lang.org] Scala Events
Martin Odersky and Iulian Dragos will be giving a two day Scala training course, "Object Oriented meets Functional", in Lausanne on the 25-26 of Nov 2010.

[scala-internals] protected lessons
I believe a purely test-driven approach (i.e. put change in, watch if something fails, if one more test case passes accept the change) is doomed when dealing with the compiler.
[scala-user] Re: optimizing simple fors
The time has come : Scala's 2.8.x branch compiles fine with the ScalaCL Compiler Plugin.
[Liftweb] Re: LiftRules
http://www.assembla.com/wiki/show/liftweb/LiftRules
[scala-lang.org] Scala - Teaching O-O
Yann Régis-Gianas, lecturer/assistant professor at the University of Paris Diderot - Paris 7, has chosen Scala and the Simply Scala web site to help him teach the Advanced Object Oriented course this fall.

[勉強会] 第4回Scala勉強会(SimpleModeling勉強会)
[scala-user] Re: Why wasn't 'match' implemented as a method?
It was a method until Scala 2.5. Then they ran into some problems and made it a language construct.
[scala-internals] 22 fields limit in case classes

[scala-training] Scala Training with Martin Odersky
[Liftweb] The movie of my Intro Scala presentation at the Bay Area Scala Enthusiast
http://blip.tv/file/4243180
[scala-user] Re: accessing one's inner trait
scala> trait A { trait B { def stuff: Unit } def doCB(b: B): Unit }
scala> val stableValue = new A { ... } // here you create a specific universe
scala> import stableValue._ // here you import a specific "B"
scala> class Dee extends B { ... }
[scala-user] Re: Typesafe representation of JSON document
http://github.com/lift/lift/tree/master/framework/lift-base/lift-json/
[lift-announce] Active development branches renamed
- master (previously 2.x-2.8_devel) for 2.x on scala 2.8.x
- master_2.7 (previously 2.x-2.7_devel) for 2.x on scala 2.7.x
[Scala Trac] Changeset 23250
Ticket #3487: object extending companion class cannot be run
An object with a main method can now extend its companion class
without losing the ability to run.

[scala-internals] observable laziness
[Liftweb] Major overhaul REST chapter
http://groups.google.com/group/the-lift-book/web/master.pdf
[Liftweb] Marking requests as Stateless
I've coded up some some features into Lift where you can mark certain paths as "stateless".
On stateless paths, if you write to SessionVars or the function table, an exception is generated and in development mode, an error is produced in the browser
[scala-lang.org] LinkedIn Architecture

[scala-internals] The invokedynamic in Scala
Martin says "Invokedynamic can make dispatch on structural Scala types faster, so it makes sense to use it."
[Liftweb] LiftRules
[scala-user] scala-arm and 2.9
I have nothing against submitting the code to the standard library.

[hackathon] 名古屋Hackathon
お題「ラムダ」のもとに好きにプログラミングをする集りです。
ハッシュタグ: #NagoyaHackathon

[scala] Re: Scala Lift Off 2010
David related to me that space to host the NYC Lift Off couldn't be found for a reasonable cost -- Google couldn't provide the space and renting it would cost > $10k.

[Scala Trac] Changeset 23200
scala.util.control.Breaks#tryBreakable has been added.

[勉強会] Scala勉強会第5回 in 渋谷
[scala] First in the series of C9 videos supporting monadic design patterns for the web
Please find here the first of a series of C9 video lectures discussing how to use monads to structure the code of web applications.
[Liftweb] Lift CMS site
http://github.com/dpp/hoisted

[scala-internals] Scala meeting report, 2010-09-14
[twitter] @ts71: GREE 版『おみせやさん』は Scala ってあるんだけど、フレームワークは何使ってるのかな。『Hadoop と MongoDB を活用したソーシャルアプリのログ解析』 http://slidesha.re/ciedDf

[Conference] Scala Lift Off: San Francisco Bay Area, September 24th (following JavaOne)
@dpp: Super surprise guest at the #Scala #Lift Off in San Francisco... Martin Odersky will be joining us http://scalaliftoff.com
[scala-user] Migration warning for List#union
In Scala 2.7.7:
    scala> List(1, 2) union List(2, 3)
    res0: List[Int] = List(1, 2, 3)
In Scala 2.8.0
    scala> List(1, 2) union List(2, 3)
    res0: List[Int] = List(1, 2, 2, 3)
[scala-internals] Re: Soruces for Value Classes
http://github.com/soundrabbit/scala/commits/anyValSource
http://lampsvn.epfl.ch/trac/scala/changeset/7063
[scala-user] Why Seq is not scala.collection.immutable.Seq
scala> classOf[Seq[_]]
res0: java.lang.Class[Seq[_]] = interface scala.collection.Seq

scala> classOf[Set[_]]
res1: java.lang.Class[Set[_]] = interface scala.collection.immutable.Set
scala> classOf[Map[_,_]]
res2: java.lang.Class[Map[_, _]] = interface scala.collection.immutable.Map

[scala-user] implicit parameter and class apply method
implicit def anyMaybeDo[T: Manifest](x: T) = new {
def doif[U: Manifest](body: U => Unit): Unit =
if (manifest[T] <:< manifest[U]) body(x.asInstanceOf[U])
}
scala> 44.doif[Int](println)
44
scala> 44.doif[String](println)
[scala-user] optimizing simple fors
https://lampsvn.epfl.ch/trac/scala/ticket/1338
Martin says "I have dreamed for about 5 years now that for loops should be just as fast as while loops, just using normal optimizations that are applicable everywhere."
[conference] JavaOne 2010
JavaOne 2010: Functional Programming, from Java to Scala
JavaOne 2010: Polygot Programming in the JVM
JavaOne 2010: A Brief Introduction to Scala
JavaFX Your Way: Building JavaFX Applications with Alternative Languages, pdf

[勉強会] Scala勉強会第3回 in 渋谷
[勉強会] Scalaコップの会13杯目
[scala-internals] Upcoming release: 2.8.1.RC1
[Liftweb] Re: parallel lazy load
Lift 2.1-RC1 contains a correct implementation of the <lift:LazyLoad/> snippet.
[lift-announce] Lift Web Framework 2.1 Release Candidate 2 released
[twitter] @jorgeortiz85: @djspiewak Foursquare will be open sourcing some cool goodies on top of Lift soon. Any chance of Novell doing the same?

[BASE] BASE Meeting #30 - 7pm Monday Sept 13th at LinkedIn in Mountain View
So, this month we are going to do beginners night. David Pollak will give an overview of Scala for beginners ...
[scala-lang.org] Another thousand questions on Stackoverflow
[togetter] 9/13 夕方～深夜の Scala。
"Scalaは機能が豊富すぎて、たくさんのゴミが詰まっているというのが個人的な印象ですね" Rubyの魔術－＠IT http://bit.ly/9l5jqr

[scala] Re: Programming Challenge
scala> (1, "a", "false") copy (_2 = 0.5)
res0: (Int, Double, java.lang.String) = (1,0.5,false)

[scala-user] Re: Any Scala books out coverring 2.8?
Josh Suereth says 'I hope to release one before the end of the year, but likely sometime next year called "Scala In Depth" that will cover 2.8 related features'.
David Pollak says 'Sadly, Apress had very little interest in an updated version of Beginning Scala (which is based on 2.7.3). Sigh'.
Dean Wampler says 'We did the best that we could at the time to cover 2.8 in "Programming Scala", but there are still a number of areas that changed since then, like the internals of the collections library'.
[Liftweb] Lift & Tecnical Debt
Innovation Games Online (http://innovationgames.com) is a Lift-powered app and a pretty sweet one.
http://tunaforcats.com/UsingInnovationGamesToPrioritizeTechnicalDebt.pdf

[scala] Re: scaladoc wiki syntax and new tags: to what degree is they supported?
FYI, I'm using what's on trunk, and I know that 2.8.1 (which trunk is the basis of to some degree) contains scaladoc improvements that might not exist for 2.8.0.
[scala] Scala 2.8 Collections API Charted Out
http://www.decodified.com/scala/collections-api.xml
http://github.com/sirthias/scala-collections-charts
The layout for example almost always needs some manual tweaking in order to produce visually appealing results.
[twitter] @djspiewak: Nifty Scala trick that I didn’t know about: turn *any* val into a function of arity-0 using the underscore.
[scala-tools] new parser tool - parboiled
http://wiki.github.com/sirthias/parboiled/simple-scala-example

[勉強会] 札幌Scala勉強会05
[勉強会] Scala勉強会第2回 in 渋谷
[scala-user] Re: smallest element of a list
Martin says "More classes will be specialized in 2.9.0. It depends on how much resources we have available for this and how hard it will urn out to be, so no promises yet as yo specifics".

[scala-user] Scala lexer for SciTE and other Scintilla-based editors
[scala-user] Re: withDefault and withDefaultValue for mutable maps
http://lampsvn.epfl.ch/trac/scala/ticket/3829
[Liftweb] Scala & Lift on Jax Magazine
http://jaxenter.com/jaxmag/
[scala-lang.org] What's new in Scala 2.8 - Chained Package Clauses
[twitter] @kmizu: implicit conversionによるパフォーマンスペナルティは、エスケープ解析が有効だどうなるのかという実験。興味深いことにエスケープ解析が有効な場合、ほとんどコストがゼロという結果が出ている。 http://bit.ly/bsdIIK #scala

[scala] Re: scaladocs in friendly data format
Next version of vscaladoc will generate apidoc in JSON. I hope to announce version 0.1 in one or two week.
[scala-user] Re: get the scala version at runtime
scala> scala.util.Properties.versionString

res0: java.lang.String = version 2.8.0.final
scala> scala.util.Properties.versionMsg
res1: String = Scala library version 2.8.0.final -- Copyright 2002-2010, LAMP/EPFL

scala> scala.util.Properties.scalaPropOrElse("version.number", "unknown")
res2: String = 2.8.0.final

[Conference] 第一回 Scala座
 まとめ
[scala] Offtopic: Scala activities at JavaZone next week
The JavaZone conference in Oslo, Norway next week ( http://jz10.java.no/ ) cooperates with the norwegian scala user group. This year, this has resulted in a sizeable number of Scala presentations - 8% of the total number of presentations, to be exact.
[lift-announce] Lift Web Framework 2.1 Release Candidate 1 released
[scala-user] spacial indexing / collision detection, quadtree performance issue

[scala-user] Update on FRP project
With G-d's help I've uploaded some updates to my FRP project at http://github.com/nafg/reactive
[Liftweb] Lift does SBT now!

[scala-user] ## ?
x.## is compiler magic for a call to ScalaRuntime.hash(x).
Re: == and equals

[BASE] BASE Meeting #29 - Thursday Aug 14th, 7pm at Twitter HQ in SF
Jonas Boner, the author of the Akka distributed/remote actor library is in town, and willing to speak to BASE on Thursday evening.
[scala-internals] some items for 2.8.1
[Twitter] @abelski: The 'Scala Fundamentals' course has a new version for the 'Classes & Objects' slides. http://bit.ly/aUK1B7[pdf]
[scala-lang.org] Simple or Complicated?
http://lamp.epfl.ch/~odersky/blogs/isscalacomplex.html

[Scala Trac] Changeset 22821
Various fixes to optimizations, and mainly much better heuristics for inlining. Now even the compiler is some 3% faster! Yeah!
[scala-user] Further understanding scala.Option
http://paste.pocoo.org/show/253343/

[勉強会] Scala@東北第１回BootCamp&Hackathon
[勉強会] 第10回名古屋Scala勉強会
[scala-internals] scala git repo has moved
http://github.com/scala/scala
[Scala Trac] Changeset 22804
@implicitNotFound(msg="Custom error message that may refer to type parameters ${T} and ${U}")
trait Constraint[T, U]
whenever an implicit argument of type Constraint[A, B] cannot be found, the custom error message will be used, where the type arguments are interpolated in the obvious way

[twitter] @jiuma In the scala-user mailing list, @gkossakowski: Scalagwt is my full-time job, at the moment http://bit.ly/blkOR3

[scala-announce] Colladoc 1.0 Beta 1 Announcement
I would like to announce the public availability of the first beta of Colladoc, the collaborative/wiki version of Scaladoc. You can try it online at http://scala-webapps.epfl.ch/colladoc/ for the Scala standard library.

[scala-user] Re: Actors syntax in 2.8
the Actor.loop is now an instance method and hence must be called self.loop when you are using it in an actor-within-an-actor. Also, calls to mailboxSize are no longer allowed except from the actor itself (or subclasses thereof).

[勉強会] Scalaコップの会第10回
[scala-user] Re: Changes in behavior of restarted actors in 2.8.0
Yes, the behavior of `start` has changed. It is now idempotent, which means that calling it multiple times has the same effect as calling it only once. ...
[scala-internals] 2.8 final around the corner
[Twitter] @chrisleague: Slides from last night's preso on continuations and monads in Scala. http://slidesha.re/bfknlN
[Twitter] @pk11: releasing play-scala 0.7 http://bit.ly/dgMAK3 #playframework #scala

[scala-user] Re: Syntax for two context bounds on a single parameter
scala> def foo[A: Arbitrary : ClassManifest] = 0
foo: [A](implicit evidence$1: Arbitrary[A],implicit evidence$2:ClassManifest[A])Int

[scala] Re: Unreachable code after return
scala -Ywarn-dead-code -e 'def foo: Any = {return 1; 2}'
scala -Xfatal-warnings -Ywarn-dead-code -e 'def foo: Any = {return 1; 2}'
[blog] Code Monkeyism: the blog for developers Scala is Unfit for Serious Development
Martin Odersky says 'In fact I am about to take a leave from university and found a startup to do commercial Scala support. I am taking some of the key Scala developers with me.'

[scala-user] Re: Implicits
fun(...)(implicit i1: X) works
fun(...)(implicit i1: X, implicit i2: Y) does NOT work
class X(...)(implicit i1: X) works
class X(...)(implicit i1: X, implicit i2: Y) does NOT work
class X(...)(implicit val i1: X, implicit val i2: Y) works
[scala-user] a simple scala hadoop example
http://github.com/cageface/scala-hadoop-example
[Liftweb] ToDo getting started app using CouchDB
http://github.com/ghostm/lift-todo-couchdb

[lift-committers] Site Stats
FYI, in the past month liftweb.net has had 28,000 unique visits, with
near 80,000 page views!! pretty awesome stuff as each users is
spending on average 3 mins with the site....

[scala-user] Partially applied map function throws error
scala> val l = List(1,2,3,4,5,6)
scala> l.map _ // error
scala> l.map (_: Int => Int)
scala> res2(_ * 10)
res3: List[Int] = List(10, 20, 30, 40, 50, 60)
[scala-user] Re: fastest/easiest way for deep primitive array copy?
val newdata = data.map(_.clone)

[scala-user] Re: actor() as new Thread()
In Scala 2.8.0 the default thread pool only grows when actors are blocked in a `receive`, `receiveWithin`, or some other thread-blocking operation implemented by the actors library (such as a synchronous send).

[scala] Re: Explicit vs implict return type Double
Martint says 'OK, tests passed. The next nightly should have the reverted semantics.
I'll see when we can roll the next RC.'

[scala] Re: == and equals
FYI here is a summary of ==/equals I sent to -internals on Apr 13....
[Liftweb] Lift 3.0 and sbt
[scala-lang.org] NASA/JPL Launch DSLs in Scala
paper, video at Scala Days 2010

[Lift-announce] Lift Web Framework 2.0 Release Candidate 1 released
[scala-user] An Efficient Scalar Package in Scala
http://RussP.us/scalar-scala.htm
[scala-user] Re: @ScalaSignature. Is it just wasting a significant chunk of jar size or is it useful?
[Scala-Trac] Ticket #1591 Inner objects inside a class are not singletons
we will postpone fixing this bug until 2.8.1.
[Scala-Trac] Ticket #3007 Objects and lazy are not thread-safe
(In [22206]) Make local lazy values thread-safe. A local lazy val (defined inside a method) is now guaranteed to be initialized at most once,...
[Twitter] @dpp: Presenting "How Scala does closures" at the JVM Language summit
[Twitter] @ijuma: Scala 2.8.0.RC4 should be out this week and may be the final according to Martin. #lsug
[scala-user] tiscaf-0.3 is released

[scala-user] Re: annotation on constructor args disappearing since 2.8.0-RC1
http://lampsvn.epfl.ch/trac/scala/ticket/3421
[Liftweb] The Lift 3.0 discussion
[Liftweb] Ostrich Integration in ESME
[scala-internals] /tmp/bug6503430*.tmp
Changeset 22195
[scala-user] Re: a scala puzzler for jun 7 2010
What are x1 and x2?
scala> def f[T](x1: T, x2: T) = x1 == x2
f: [T](x1: T,x2: T)Boolean
scala> x1 == x2
res0: Boolean = false
scala> f(x1, x2)
res1: Boolean = true
----
val x1 = java.lang.Double.valueOf(-0d)
val x2 = java.lang.Double.valueOf(0d)

[scala-announce] [ANN] O/R Broker 3.0 RC1
http://www.orbroker.org
[scala-user] Re: Scala compiler plugin to build expression trees
Here is a self contained program which will parse a command line and print the tree...

[scala-user] Re: Math.pow deprecated?
These sort of things have moved to the scala.math package object in 2.8.
[NYSE] Introduction to Scala

[Conference] Portland Code Camp 2010
Scala at Scale, Alex Payne
[scala-user] Re: Acors: Future only thread-based?
You can await a future in an event-based way using the future's input　channel and `react`:
val ft = future { ... }
　　 // ...
ft.inputChannel.react {
case result => ...
}
[scala-user] Re: An example of why I'm finding Scala tricky to learn
Scala has the rule, that implicits without full type information are applicable only after they are defined.

[scala-user] foreachWithIndex
aSeq.zipWithIndex.foreach or aSeq.zipWithIndex.foldLeft etc
someSeq.foldLeft(0) { (idx, x) => printf("item %d == %s\n", idx, x); dx+1 }
someSeq.foldRight(someSeq.length) { (idx, x) => printf("item %d == %s\n", idx, x); idx-1 }
[scala-debate] JDK7 MethodHandle for Scala's Closures?
http://www.java.net/sites/default/files/lambda__JSR292.pdf
[Scala Trac] Ticket #3454 class X(private x:Int) is valid on 2.8RC2

[scala-internals] more error message toys I wrote this weekend
[scala-user] Re: Parameterized Patterns
It's on the hypothetical list. The biggest reason it doesn't exist is that nobody has any chance of making big changes to the pattern matcher,as anyone who could do that should have fixed it by now.

[scala-announce] Scala 2.8.0 RC2

[scala-internals] sizeHint
Let's add a new sizeHint variant to Builder, like this: ...

[Conference] Chicago Code Camp 2010
The Seductions of Scala, Dean Wampler

[lift-announce] **BREAKING CHANGES** Paginator
[Liftweb] Re: dealing with http parameters
case "api" :: "thing" :: Helpers.AsInt(id) :: _ => ...

[scala-tools] Scala, SBT and Emacs
[scala-tools] [ANN] Scalariform, a Scala source formatter + an Eclipse plugin
[LSUG] Scala, Traits & Mixins by Kevin Wright
[BASE] BASE Meeting #24
This month David Pollak will be telling us all about Stambecco, the new name for Goat Rodeo - a next generation full stack framework,...
http://415.im/stambecco_preso_base_2010_04_12.odp

[New York Technology Meetup] Inaugural Meetup
Our first speaker is going to be @harryh from foursquare.
[blog] Introducing Gizzard, a framework for creating distributed datastores
[Liftweb] Re: What type of webapp is the sweet spot for Scala’s Lift framework?
screencast of building a live chat on Liftweb with Netbeans

[scala-internals] collections work

[勉強会] (仮称)クラウド研究会＠札幌第一回勉強会
匠Lab フェローの浅海智晴（あさみともはる）さんが開発/開発中の以下の2つの試作アプリケーションをネタにソースコードを見ながらクラウド・アプリケーション・アーキテクチャ、 Scala、Androidといった話題でディスカッションを行います...
[scala-announce] [ANN] O/R Broker 3.0 beta 1

[勉強会] 第05回名古屋Scala勉強会
[scala-lang.org] Kojo - Scala for Kids
[scala-internals] Scala Meeting report, 2010-03-16
[scala] Re: Your Summer of Code with Scala
The Scala team is proud to inform that we have been accepted as a mentoring organization for the Google Summer of Code!

[Scala Trac] Changeset 21091
new immutable HashMap implementation based on a hash trie.

[Liftweb] **BREAKING CHANGES** in lift-record
[Liftweb] Response Optimizations too aggressive
This is where Lift's FactoryMaker shines. You can modify the behavior of stripComments on a request-by-request basis.

[scala-internal] Actor Implementation with Jetlang, Jetlang

[scala-user] Scala IDEs: Martin said,

That's why I have finally taken the plunge and got personally involved in
rewriting the IDE/compilerinterface. Judge us again in 2-3 months, please.

Scala勉強会＠東北

Scala勉強会＠東北	このサイトを検索

Scala勉強会＠東北

Navigation

Recording events on the Scala community

コメント