Ruby 2.4.0-preview3 リリース

Posted by naruse on 9 Nov 2016

Ruby 2.4.0-preview3がリリースされました.

これはRuby 2.4.0に向けた3番目のプレビューリリースになります。 プレビューリリースとはRubyコミュニティのフィードバックを得るためにリリースされています。 何かお気づきの際は、Ruby 2.4.0をよりよくするためにRuby バグレポートガイドラインを参考にしてバグレポートや提案を送ってください。

Introduce hash table improvement by Vladimir Makarov

従来Rubyのハッシュテーブルの内部実装 (st_table) ではに双方向連結リストとチェイン法を用いた実装が使われていましたが、挿入順の配列にオープンアドレス法を用いることによる高速化が行われました。 この改善に際しては多くの方による議論が行われ、とりわけ Yura Sokolov 氏によって多大な貢献がありました。

Binding#irb: Start a REPL session like binding.pry

pry を用いると binding.pry とアプリケーションに書くことで、その場で対話型実行環境を起動することができ、デバッグの際に便利です。 r56624 にて binding.irb と書くことで同様なことをirbを用いて行える機能が入りました。

Unify Fixnum and Bignum into Integer

Though ISO/IEC 30170:2012 doesn’t specify details of the Integer class, Ruby had two visible Integer classes: Fixnum and Bignum. Ruby 2.4 unifies them into Integer. All C extensions which touch the Fixnum or Bignum class need to be fixed.

See also the ticket and akr’s slides.

String supports Unicode case mappings

String/Symbol#upcase/downcase/swapcase/capitalize(!) now handle Unicode case mappings instead of only ASCII case mappings.

Performance improvements

Ruby 2.4 also contains the following performance improvements including language changes:

Array#max, Array#min

[x, y].max and [x, y].min are optimized to not create a temporary array under certain conditions.

Regexp#match?

Added Regexp#match?, which executes a regexp match without creating a back reference object and changing $~ to reduce object allocation.

Other performance improvements

Debugging

Thread#report_on_exception and Thread.report_on_exception

Ruby ignores exceptions in threads unless another thread explicitly joins them. With report_on_exception = true, you can notice if a thread has died due to an unhandled exception.

Send us feedback what should be the default for report_on_exception and about report-on-GC, which shows a report when a thread is garbage collected without join.

Thread deadlock detection now shows threads with their backtrace and dependency

Ruby has deadlock detection around waiting threads, but its report doesn’t include enough information for debugging. Ruby 2.4’s deadlock detection shows threads with their backtrace and dependent threads.

Try and enjoy programming with Ruby 2.4.0-preview3, and send us feedback!

Other notable changes since 2.3

  • Support OpenSSL 1.1.0
  • ext/tk is now removed from stdlib [Feature #8539]
  • XMLRPC is now removed from stdlib [Feature #12160]

See NEWS and ChangeLog for details.

With those changes, 2470 files changed, 283051 insertions(+), 64902 deletions(-) since Ruby 2.3.0!

Download

  • https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-preview3.tar.bz2

    • SIZE: 12615328 bytes
    • SHA1: fefe49f6a7d5b642936c324f3b05aaac827355db
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  • https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-preview3.tar.gz

    • SIZE: 15758023 bytes
    • SHA1: f6a6ec9f7fedad0bf4efee2e42801cc963f60dca
    • SHA256: c35fe752ccfabf69bf48e6aab5111c25a05938b428936f780638e2111934c9dd
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  • https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-preview3.tar.xz

    • SIZE: 9957596 bytes
    • SHA1: 66592b1a52f985638d639e7c3dd6bdda4e0569d0
    • SHA256: b14be2b5c80bff0d6894ae2b37afdb17a968413e70236ec860f3e2d670b4c317
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  • https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-preview3.zip

    • SIZE: 17579012 bytes
    • SHA1: 15d08cff952da3844ae54887b7f74b12d47c9ee2
    • SHA256: b95a8f67fb7d6e852db77c5660c8878c14d68eb72c5501dac164a7e640ecb06e
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Release Comment

See also the release schedule and other information:

ReleaseEngineering24