Scala勉強会@東北が見た Scala 2.8.0.final へのあゆみ

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Scala勉強会@東北が見た Scala 2.8.0.final へのあゆみ

Scala Watch

2009-05-27

[scala-lang.org] SID #1 (draft) - Named and Default Arguments

2009-05-28

[scala-lang.org] SID #2 (draft) - Scala Compiler Phase and Plug-in Initialization for Scala 2.8

2009-05-30

[scala-lang.org] SID #3 (draft) - New Collection Classes

2009-06-02

[scala-lang.org] A Taste Of 2.8: Scala Collections
[scala-lang.org] SID #4 (draft) - Early Member Definitions

2009-06-03

[scala-lang.org] A Taste Of 2.8: Named and Default Arguments

2009-06-04

Bay-Area Scala Enthusiasts Meeting: What's New In Scala 2.8
There are a few more months before it is released. A preview is planned for July, followed by the final release in September or October.

2009-06-05

[scala-lang.org] A Taste Of 2.8: Continuations

2009-06-07

[scala-lang.org] A Taste Of 2.8: The Interactive Interpreter (REPL)

2009-06-09

[Scala Trac] Ticket #2047 (scaladoc needs work before 2.8 ships)

2009-06-11

[scala 2.8] Using Implicits to Select Types

2009-06-23

[Liftweb] Lift + Scala 2.8

2009-06-24

[Liftweb] dpp @jonoabroad 1.1 release isn't until September or October. A month after Scala 2.8

2009-07-03

[scala-internals] @specialized arguments

2009-07-13

[scala-user] extra /* chars in 2.8.0 docs

2009-07-21

[Scala Trac] Ticket #2147 2.8: simple for comprehensions involving Stream don't work properly(closed defect: fixed)

2009-07-29

[Liftweb] Lift + Scala 2.8
After we get the next milestone out the door, we'll focus more on the 2.8 parallel branch. I had a chat with Martin and it doesn't look like 2.8 is going to be out in September, so we've got time.

2009-08-08

[scala] Package behaviour change for 2.8?
The new way to do this.

2009-08-11

[scala-user] Any guesstimated release dates for 2.8 final?
We have also decided to release a Scala 2.7.6 in mid-September.

2009-08-12

[scala-user] Re: 2.8.0 converting from Java List to Scala List

2009-08-21

[scala-user] Actors in 2.8
It seems that the .mailboxSize method is no longer available for Actor instances in 2.8
[scala] Re: Can the 2.8 REPL be embedded in a Java application?

2009-08-23

[scala-user] Re: Basic question on Option
Since 2.8,
import scala.util.control.Exception.catching
catching(classOf[NumberFormatException]) opt "55bloogle".toInt

2009-08-27

[blog] Control flows in Heaven with Scala 2.8 continuations - Part 1

2009-08-31

[blog] Control flows in Heaven with Scala 2.8 continuations - Part 2

2009-09-18

[scala-user] Re: Sum of digits
NumericTraversableOps#sum since 2.8

2009-09-25

[scala] NodeSeq, implicit conversions and 2.8
def display(in:Seq[String]):NodeSeq =(in.map(s=>{s}):Seq[Elem])
[scala-user] Re: Has @specialized arrived at trunk?

2009-09-29

[Liftweb] Removing Scala Actors from Lift
The issues (with the Scala Actors in general and Lift's use of them) are ...
About actors in scala 2.8 ...
Here is a list of the things that Akka currently does...

2009-10-01

[scala-internals] Potential bug in 2.8 20090929 build
New Arrays are now truly native Arrays. They are not Seqs anymore on scala 2.8.
[scala-lang.org] SID # 7 (draft) - Scala 2.8 Arrays
[scala-debate] Re: Re: Sequence -> Seq

2009-10-06

[scala] Scala collections 2.8 using bit-partitioned hash tries?
https://lampsvn.epfl.ch/trac/scala/ticket/1509

2009-10-08

[scala-user] Re: How to make the thread created by "Actor" to become a daemon thread ? ? ? ?
On Scala 2.8 it is very easy: just use the `DaemonActor` trait instead of the `Actor` trait.

2009-10-09

[scala-tools] [ANN][netbeans] Scala plugin for NetBeans 6.8 m2 and Scala 2.8.0 snapshot is available as beta

2009-10-15

[Liftweb] Re: Lift 1.1 must use Scala 2.8.x ?
[scala] Array Performance in 2.8
[scala-internals] Scala Meeting report, 2009-10-13

2009-10-21

[scala-internals] Scala Meeting report, 2009-10-20

2009-10-27

[scala-user] Re: Help with Manifest
On Scala2.8: scala> manifest[List[Int]].typeArguments.head

2009-10-28

[scala-announce] Scala 2.7.7 final
[scala-internals] Scala Meeting report, 2009-10-27

2009-11-04

[scala-internals] Lift (kinda) compiles and (sorta) runs on Scala 2.8
Martin Odersky said "We hope to have a feature frozen version by the end of the week".
[scala-internals] Scala Meeting report, 2009-11-03

2009-11-07

[scala-internals] rethinking map2 and friends
[scala] recent changes in 2.8 nightly classpath management

2009-11-10

[scala-user] Re: State of Scala io for 2.8 ?

2009-11-12

[scala-internals] Scala Meeting report, 2009-11-10

2009-11-13

[Liftweb] Re: Lift under 2.8 timeframe ?
We are *very* serious and *VERY* (lots of emphasis) committed to Scala 2.8. I'm expecting that Lift 1.1 ships (currently plans for early Jan) as Scala 2.8 only or as two flavors (2.7.x and 2.8)
[scala-user] Re: vscaladoc on scala-lang out of date
the 2.8 version of Scaladoc is in fact merging functionality from both Scaladoc and vScaladoc, so you'll see some of those changes come up soon.
[scala-internals] First candidate for 2.8.0 beta

2009-11-17

[scala-internals] New SID draft: Scala Specialization
http://www.scala-lang.org/sid/9

2009-11-18

[scala-internals] Scala Meeting report, 2009-11-17

2009-11-20

[scala-internals] Lift compiles on Scala 2.8 and runs the demo

2009-11-25

[scala] Why is containsSlice deprecated in 2.8?
[scala-internals] Scaladoc 2
[scala-internals] Scala Meeting report, 2009-11-24

2009-11-26

[scala-internals] RC2 candidate for the first 2.8.0 beta

2009-12-01

[scala] Re: jvm5 build should be default?
We just decided in the Scala meeting to keep Java 1.5 as not only the default, but the only version required by Scala 2.8.

2009-12-03

[scala-internals] Scala Meeting report, 2009-12-01

2009-12-07

[scala-user] Re: JPA annotations fails when using 2.8 beta (also rc2)
The syntax (for annotations) has changed in 2.8, you should use named arguments.

2009-12-10

[scala-internals] Scala Meeting report, 2009-12-08

2009-12-17

[scala-internals] Scala Meeting report, 2009-12-15
[scala-internals] RC3 candidate for the first 2.8.0 beta

2009-12-18

[scala-internals] RC4 candidate for the first 2.8.0 beta

2009-12-21

[scala-internals] RC5 candidate for the first 2.8.0 beta

2009-12-23

[scala-internals] RC6 candidate for the first 2.8.0 beta

2009-12-24

[scala-internals] Scala Meeting report, 2009-12-22

2009-12-25
- [scala-user] Re: problem with annotations in 2.8
2009-12-29

[scala-user] Re: converting tuple into method parameters
Since 2.8, FunctionX.tuple have been added. As for Scala 2.7, use Function.tupled

2009-12-31

[scala-user] Re: What is <:<
Refer to Scala 2.8's Option.orNull and Either.joinRight
http://gist.github.com/229163
http://gist.github.com/257758

2010-01-07

[scala-internals] Scala Meeting report, 2010-01-05
[scala-internals] releasing 2.8

2010-01-08

[scala-internals] RC7 candidate for the first 2.8.0 beta

2010-01-19

[scala-internals] RC8 candidate for the first 2.8.0 beta

2010-01-22

[scala-internals] 2.8 RC8

2010-01-25

[Liftweb] Lift 2.0 on Scala 2.8 update

2010-01-27

[scala-lang.org] Scala 2.8.0 Beta 1
[Liftweb] Lift and Scala 2.8 Beta1

2010-01-29

[scala-tools] Re: NetBeans Plug for 2.8 BETA1?

2010-01-30

[scala-user] Re: Scala 2.8 Eclipse plugin beta - compilation errors in Lift
There is a change to type inferencing in 2.8. The construct: SHtml.text(hours, hours = _) No longer seems compiler-friendly. Try: SHtml.text(hours, x => hours = x)

2010-02-03

[scala] Re: Scala 2.8 Problem
On scala 2.8, fields.map(_.name)(2) does not work. It should be fields.map(_.name).apply(2) The issue is that map() now takes a second implicit parameter.

2010-02-05

[scala-internals] Scala Meeting report, 2010-02-02
[scala-internals] 2.8 migration guide needed
"in 2.8 throws a MatchError. Arrays are not sequences anymore,"
[scala] 2.8, type parameters, manifests and traits
Predef.=:=
[scala] New draft paper on unique references and Scala compiler plug-in
http://lamp.epfl.ch/~phaller/capabilities.html

2010-02-09

[scala-user] Re: Enhanced actors in 2.8
a `Reactor` is more lightweight than an `Actor`

2010-02-10

[scala] sort on two keys
How about (using 2.8's sortBy):
for ( (a,b) <- m.toSeq.sortBy{ case (a,b) => (-b, a) } ) yield a

2010-02-18

[scala-user] Re: Using 2.8's Context Bounds when a class takes multiple type parameters?
It's covered in the 2.8 Arrays SID document http://www.scala-lang.org/sid/7
Generally, a type parameter with a context bound is of the form[T: Bound]; it is expanded to plain type parameter T together with an implicit parameter of type Bound[T].
[Scala Trac] Changeset 20918
you can no longer do:
   "bob".reverse match { case Seq('b', 'o', 'b') => true } // denied!
   "bob".toArray match { case Seq('b', 'o', 'b') => true } // rejected!
   final class Dunk
   def f3(x: Dunk) = x match { case Seq('b', 'o', 'b') => true } // uh-uh!

2010-02-20

[scala-user] Re: [newbie] problem reading a file
In 2.8, use io.Source#fromPath if you pass a String, and io.Source#fromFile if you pass a java.io.File.

2010-02-21

[scala-user] Re: What's the current status of type specialization?
Development has slowed down quite a bit since I am writing my thesis, and that's part of the reason specialization is still a -Y option (in other words, use on your own risk).

2010-02-24

[scala-debate] Re: 2.8 copy method needs improvement
Martin Odersky says Case class inheritance has a lot of small annoying consequences, ...

2010-02-25

[scala-user] Re: Why Scala actors 15-20 times slower compare to Jetlang and/or Groovy++ messaging
http://groovy.dzone.com/articles/why-scala-actors-15-20-times
Philipp Haller says Indeed, I expect this benchmark to run much, much faster using Reactors in Scala 2.8 (even normal actors).

2010-02-27

[scala-user] I don't understand this list error in 2.8
The previously deprecated method List.+ has been removed on 2.8.

2010-03-07

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

2010-03-08

[scala-user] Scala 2.8B1, sbt and Eclipse screencast
http://www.mgutz.com/2010/03/06/get_started_with_scala_sbt_and_eclipse.html

2010-03-10

[scala] a compiler crash on 2.8.Beta1

2010-03-14

[scala] Re: a compiler crash on 2.8.Beta1
https://lampsvn.epfl.ch/trac/scala/changeset/21164

2010-03-20

[scala-internals] Countdown to 2.8

2010-03-23

[Liftweb] Lift 2.0 and Scala 2.8

2010-03-24

[scala-internals] Scala 2.8 RC 1 next week

2010-03-29

[scala-user] [ANN] lib.web 0.4.0 for Scala 2.8.0.Beta1 + google groups.

2010-04-01

[scala-user] ANN: Akka 0.8 (with Scala 2.8 support) is released

2010-04-15

[scala-announce] Scala 2.8.0 RC.1
[scala-user] [ANN][netbeans] NetBeans(6.8) plugin for Scala 2.8.0 RC1
[lift-reviewboard] lift-scalate module along with a simple helloscalate sample
[scala-internals] Scala Meeting report, 2010-03-30
[scala-internals] Scala Meeting report, 2010-04-07
[scala-internals] Scala Meeting report, 2010-04-13
[Liftweb] Scala 2.8 RC1 and Lift on Scala 2.8

2010-04-18

[Liftweb-assembla] Squeryl integration for Record (Scala 2.8 only)

2010-04-24

[scala-user] Scala 2.8.0.RC1, sbt and ScalaTest step-by-step
http://www.paulbutcher.com/2010/04/scala-2-8-0-rc1-sbt-and-scalatest-step-by-step/

2010-04-30

[scala-user] Re: Problem with scala 2.8 and arrays
If you're using generic array functions like this, the manifest is always required.

2010-05-10

[scala-announce] Scala 2.8.0 RC2

2010-05-11

2010-05-13

[scala-user] Re: Call-by-name problem with implicit conversions
[scala-user] Re: Performance regression in 2.8.0RC2
The immutable collections now have an IndexedSeq that defaults to Vector (which has O(log(n)) lookups).
[scala-internals] Scala Meeting report, 2010-05-11

2010-05-20

[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 Trac] Ticket #3454 class X(private x:Int) is valid on 2.8RC2

2010-05-24

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

2010-05-27

[scala-announce] Scala 2.8.0 RC3
[Scala Trac] Ticket #3488 compile error for _* with default argument

2010-05-29

[Liftweb] Lift -> 2.8.0.RC3

2010-05-30

[scala-internals] Lift 2.8.0(2.0-scala280-SNAPSHOT) in Scala-tools is upgrading to RC3

2010-06-04

[Scala Trac] Changeset 22154
#3436 Source#fromURL will not close its inputstream. was fixed, but scala.io.Source APIs were changed.

2010-06-08

[scala-user] Re: annotation on constructor args disappearing since 2.8.0-RC1
http://lampsvn.epfl.ch/trac/scala/ticket/3421

2010-06-10

[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] @ijuma: Scala 2.8.0.RC4 should be out this week and may be the final according to Martin. #lsug

2010-06-14

[scala-announce] Scala 2.8.0 RC5
[scala-user] The Scala IDE for Eclipse for Scala 2.8.0.RC5 available now!

2010-06-15

[scala-user] Re: change log between rc versions
https://lampsvn.epfl.ch/trac/scala/log/scala/branches/2.8.x

2010-06-16

[scala] Lift 2.0 + Scala 2.8 demo project - all running on stax.net!
http://minesweeper.kevwright.staxapps.net/

2010-06-17

[lift-commiters] Looks like we need a 2.8.0 RC6
https://lampsvn.epfl.ch/trac/scala/changeset/22334

2010-06-18

[scala-internals] Scala Meeting report, 2010-06-16
[scala-announce] Scala 2.8.0 RC6
[scala-tools] The Scala IDE for Eclipse for Scala 2.8.0.RC6 available now!

2010-06-19

[lift-announce] The Lift 2.0-scala280-SNAPSHOT code is now running against Scala 2.8.0.RC6

2010-06-20

[scala] Re: == and equals
FYI here is a summary of ==/equals I sent to -internals on Apr 13....

2010-06-21

[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.'

2010-06-22

[scala] Status of 2.8

2010-06-28

[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).

2010-06-29

[scala-user] Simply Scala 2.8
http://www.simplyscala.com/2.8

2010-07-01

[scala-user] FreeBSD problem (2.8-RC6) (solved)
$ JAVA_OPTS='-Djava.net.preferIPv4Stack=true' fsc -verbose -server
[scala-announce] Scala 2.8.0 RC7
[Liftweb] Lift 2.0, Scala 2.8, and AppEngine
Doing any work for GAE is a waste of time. Why? ...

2010-07-07

[scala-user] pattern matching for Pair compile error

2010-07-08

[scala-internals] Re: scalac failed to load class file produced by javac in RC7

2010-07-13

[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

2010-07-15

[scala-announce] Scala 2.8.0 final
[scala-tools] The Scala IDE for Eclipse for Scala 2.8.0.final available now!

勉強会

第33回勉強会(2009-05-14)

ちょっと気が早いですが、Scala 2.8.0 で新しく導入される幾つかの機能を、コードを参照しながら見てみます。
Scala 2.8 の新機能及び変更点について

第34回勉強会(2009-05-21)

Scala 2.8 で再設計されたコレクションクラスに関する文書 2.8 collections [pdf]を読んでみます。

参考資料: http://scaladocs.jcraft.com/2.8.0/
手元に Scala 2.8 nightly build がない場合: http://scala28-nightly-build.appspot.com/

第35回勉強会(2009-05-28)

Scala 2.8 で導入予定の @specialized annotation について見てみます。

Compiling Generics Through User-Directed Type Specialization[pdf]　を読んでみます。
@specialized が使える処理系を実際に動かしてみて、その動作を確かめてみます。
Type Specialization on Scala 2.8

第48回勉強会(2009-09-17)

９月１１日のSeasar Conference 2009 Autumnにおいて、yuroyoroさんが発表された
Java プログラマに捧げる Scala入門のスライドを見てみたいと思います。また、そちらでは
触れられていない "Javaプログラマにとって有用な事柄" についても紹介してみたいと思います。
参考: Java プログラマがへぇーっていうScalaの話

第49回勉強会(2009-09-24)

前回に引き続き、Scala入門です。
今回は、「Scalaで書きはじめたJava使い向け」というスタンスでやってみます。
資料: Scala 入門 - Scalaで書きはじめたJava使い向け

第68回勉強会(2010-03-04)

scala2.8移行ポイント(takedasoft)

水島さんのエントリを自分で解釈して発表してみます。
これまでScalaWatchやメーリングリストで挙がっているポイントを整理します。
Liftアプリを2.8に移行して気づいたことを挙げます。
その他、2.8で気をつけたほうが良いと思われる内容を、みなさまから教えていただいてサポートいただけるとうれしいです。
資料: http://sb.takeda-soft.jp/pub/27to28.pdf

第72回勉強会(2010-04-01)

Scala 2.8 でのコレクションライブラリの再実装に伴って、String に対しても使えるようになったメソッドが増えています。今回は、どのようなメソッドが使えるようになったかを確認しながら、その実装を見てみます。

参考: Available Methods for String on Scala 2.7 & 2.8
参考: 第16回 Scala 2.8の新機能 (2) --- コレクションライブラリの再実装, 図2●コレクションクラス階層図
参考: Predef.scala
参考: collection/immutable/StringOps.scala, collection/immutable/StringLike.scala
参考: collection/IndexedSeqLike.scala, collection/SeqLike.scala
参考: collection/IterableLike.scala, collection/TraversableLike.scala , collection/TraversableOnce.scala
参考: The nightly Scala API

第77回勉強会(2010-05-20)

Scala 2.8 で追加されたクラス、メソッドをみてみます。

参考： Nifty Traits, Classes and Methods Since Scala 2.8

第79回勉強会(2010-06-03)

第33回勉強会(2009年5月14日開催)において SIP - Named and Default Arguments を見ましたが、その当時の版からいくつかの変更がなされているようです。今回は、@oshitab さんの Named and Default Argument in Scala 2.8 を参考に、改めてもう一度"名前付き＆デフォルト引数"を見てみます。

参考: Named and Default Argument in Scala 2.8 by @oshitab さん
参考: SID#1 - Named and Default Arguments
参考: SIP - Named and Default Arguments
参考: Scala Days 2010: Named and Default Arguments in Scala

第82回勉強会(2010-06-24)

Scala 2.8 から導入される specialized annotation を見てみます。
第35回勉強会(２００９年５月２８日開催)において、specialized annotation について調べてみましたが、当時と比べると実装が変わっており、また trunk に実装が入ってきていて 2.8.0RCで簡単に試せるようになっているので、今一度実際に動かしながら試してみます。また、実装上の制限についても見てみます。

参考: SID # 9 - Scala Specialization
参考: Type specialization on Scala 2.8 (第35回勉強会の資料)
参考: http://gist.github.com/451094
参考: foreachとwhileの速度差 - Onion開発しつつ、PEGEXを開発する日記
参考: Jesper's Blog: Scala Stream Fusion and Specialization
参考: Jesper's Blog: Scala Stream Fusion and Specialization, Part2
参考: https://lampsvn.epfl.ch/trac/scala/ticket/3433

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