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Ruby 2.4.0 Released (ruby#1535)
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‎_data/branches.yml‎

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- name: 2.4
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status: preview
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date:
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status: normal maintenance
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date: 2016-12-25
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eol_date:
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- name: 2.3

‎_data/downloads.yml‎

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preview:
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- version: 2.4.0-rc1
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stable:
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- version: 2.4.0
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url:
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bz2: https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-rc1.tar.bz2
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gz: https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-rc1.tar.gz
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xz: https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-rc1.tar.xz
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zip: https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0-rc1.zip
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bz2: https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0.tar.bz2
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gz: https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0.tar.gz
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xz: https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0.tar.xz
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zip: https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0.zip
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sha256:
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bz2: 3b156b20f9df0dd62cbeeb8e57e66ea872d2a5b55fabdef1889650122bcc2ea7
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gz: e41ada7650eed2a5800534d1201ba7c88f1627085659df994f47ab4c5e327745
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xz: 3f014b3186d10676da6c512d14c65db23ccc4bf200fed9d7c6f9a58fd1e3295b
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zip: 14e6910e36618cddffeb22bad5f1052f907dc31ec93d4aa945bca0905d8a52c4
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stable:
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bz2: 440bbbdc49d08d3650f340dccb35986d9399177ad69a204def56e5d3954600cf
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gz: 152fd0bd15a90b4a18213448f485d4b53e9f7662e1508190aa5b702446b29e3d
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xz: 3a87fef45cba48b9322236be60c455c13fd4220184ce7287600361319bb63690
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zip: 5c2bbfa26fd6a15a2d70961874b0f3a386206fcc5f698e240dd8b0c9f0f18c5e
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- version: 2.3.3
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url:

‎_data/releases.yml‎

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# 2.4 series
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- version: 2.4.0
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date: 2016-12-25
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post: /en/news/2016/12/25/ruby-2-4-0-released/
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- version: 2.4.0-rc1
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date: 2016-12-12
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post: /en/news/2016/12/12/ruby-2-4-0-rc1-released/

‎en/news/_posts/2016-12-25-ruby-2-4-0-released.md‎

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---
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layout: news_post
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title: "Ruby 2.4.0 Released"
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author: "naruse"
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translator:
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date: 2016-12-25 00:00:00 +0000
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lang: en
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---
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We are pleased to announce the release of Ruby 2.4.0.
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Ruby 2.4.0 is the first stable release of the Ruby 2.4 series.
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It introduces many new features, for example:
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## [Introduce hash table improvement (by Vladimir Makarov)](https://bugs.ruby-lang.org/issues/12142)
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Improve the internal structure of hash table (st_table) by introducing open addressing
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and an inclusion order array.
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This improvement has been discussed with many people, especially with Yura Sokolov.
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## Binding#irb: Start a REPL session similar to `binding.pry`
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While you are debugging, you may often use `p` to see the value of variables.
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With [pry](https://github.com/pry/pry) you can use `binding.pry` in your application
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to launch a REPL and run any Ruby code.
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[r56624](https://github.com/ruby/ruby/commit/493e48897421d176a8faf0f0820323d79ecdf94a)
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introduces `binding.irb` which behaves like that with irb.
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## [Unify Fixnum and Bignum into Integer](https://bugs.ruby-lang.org/issues/12005)
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Though [ISO/IEC 30170:2012](http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=59579)
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doesn't specify details of the Integer class,
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Ruby had two visible Integer classes: Fixnum and Bignum.
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Ruby 2.4 unifies them into Integer.
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All C extensions which touch the Fixnum or Bignum class need to be fixed.
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See also [the ticket](https://bugs.ruby-lang.org/issues/12005) and [akr's slides](http://www.a-k-r.org/pub/2016-09-08-rubykaigi-unified-integer.pdf).
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## [String supports Unicode case mappings](https://bugs.ruby-lang.org/issues/10085)
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`String/Symbol#upcase/downcase/swapcase/capitalize(!)` now handle
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Unicode case mappings instead of only ASCII case mappings.
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## Performance improvements
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Ruby 2.4 also contains the following performance improvements including
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language changes:
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### [Array#max, Array#min](https://bugs.ruby-lang.org/issues/12172)
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`[x, y].max` and `[x, y].min` are optimized to not create a temporary array
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under certain conditions.
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### [Regexp#match?](https://bugs.ruby-lang.org/issues/8110)
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Added `Regexp#match?`, which executes a regexp match without creating
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a back reference object and changing `$~` to reduce object allocation.
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### Other performance improvements
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* [speed up instance variable access](https://bugs.ruby-lang.org/issues/12274)
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## Debugging
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### [Thread#report_on_exception and Thread.report_on_exception](https://bugs.ruby-lang.org/issues/6647)
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Ruby ignores exceptions in threads unless another thread explicitly joins them.
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With `report_on_exception = true`,
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you can notice if a thread has died due to an unhandled exception.
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Send us feedback what should be the default for `report_on_exception`
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and about report-on-GC, which shows a report when a thread is
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garbage collected without join.
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### [Thread deadlock detection now shows threads with their backtrace and dependency](https://bugs.ruby-lang.org/issues/8214)
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Ruby has deadlock detection around waiting threads, but its report doesn't
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include enough information for debugging.
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Ruby 2.4's deadlock detection shows threads with their backtrace and
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dependent threads.
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## Other notable changes since 2.3
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* Support OpenSSL 1.1.0 (drop support for 0.9.7 or prior)
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* ext/tk is now removed from stdlib [Feature #8539](https://bugs.ruby-lang.org/issues/8539)
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* XMLRPC is now removed from stdlib [Feature #12160](https://bugs.ruby-lang.org/issues/12160)
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See [NEWS](https://github.com/ruby/ruby/blob/v2_4_0/NEWS)
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or commit logs for details.
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With those changes,
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[2523 files changed, 289129 insertions(+), 84670 deletions(-)](https://github.com/ruby/ruby/compare/v2_3_0...v2_4_0)
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since Ruby 2.3.0!
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Merry Christmas, Happy Holidays, and enjoy programming with Ruby 2.4!
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## Download
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* <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0.tar.bz2>
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SIZE: 12572424 bytes
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SHA1: 944d2588308391b20a89642472454d1dfe7b2360
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SHA256: 440bbbdc49d08d3650f340dccb35986d9399177ad69a204def56e5d3954600cf
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SHA512: bef7bb53f63fb74073d071cc125fb67b273ed0779ef43c2d2969089b9ca21fff1bd012281c5b748f7a3c24dd26e71730d7248c05a01cb23ab2089eb4d02115fe
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* <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0.tar.gz>
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SIZE: 14104044 bytes
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SHA1: d44a3c50a0e742341ed3033d5db79d865151a4f4
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SHA256: 152fd0bd15a90b4a18213448f485d4b53e9f7662e1508190aa5b702446b29e3d
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SHA512: 21c9f596b42dd9cba7a53963a59fed0c2e0c1eb960a4ac7087ea3eaa991ce9252d32639e1edcb75b1d709bc07c4820a6dc336ab427d0643c6e6498e0eacdbc8b
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* <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0.tar.xz>
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SIZE: 9906880 bytes
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SHA1: 038804bbd0e77508dd2510b729a9f3b325489b2e
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SHA256: 3a87fef45cba48b9322236be60c455c13fd4220184ce7287600361319bb63690
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SHA512: 975a5388592adc038461e0acebb6c0efee242891b2ea8621476401458efe2bc0fdd317d3bf99beb745b0b3808410efdff33862da29c95c027f457943721e3ab6
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* <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0.zip>
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SIZE: 15758757 bytes
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SHA1: 29e1bab11551011718c35a51827edcb55bd656fc
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SHA256: 5c2bbfa26fd6a15a2d70961874b0f3a386206fcc5f698e240dd8b0c9f0f18c5e
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SHA512: 31d932372ce490eeac0a70bc8dcf842909a90435422398d069c05cf01d994936064b8f4e60879e28a8655c1296eb8e180e348cb95e001ed6ca73cda0ff77de23

‎ja/news/_posts/2016-12-25-ruby-2-4-0-released.md‎

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---
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layout: news_post
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title: "Ruby 2.4.0 リリース"
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author: "naruse"
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translator:
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date: 2016-12-25 00:00:00 +0000
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lang: ja
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---
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Ruby 2.4シリーズの最初の安定版である、Ruby 2.4.0がリリースされました。
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Ruby 2.4.0 には以下に示すようなたくさんの新機能が含まれています:
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## [Introduce hash table improvement by Vladimir Makarov](https://bugs.ruby-lang.org/issues/12142)
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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。
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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。
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## Binding#irb: Start a REPL session like `binding.pry`
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[pry](https://github.com/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。
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[r56624](https://github.com/ruby/ruby/commit/493e48897421d176a8faf0f0820323d79ecdf94a) 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。
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## [Unify Fixnum and Bignum into Integer](https://bugs.ruby-lang.org/issues/12005)
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Rubyの標準仕様である [ISO/IEC 30170:2012](http://www.iso.org/iso/iso_catalogue/catalogue_tc/catalogue_detail.htm?csnumber=59579) ではIntegerクラスの詳細について定めていませんが、これまでRubyにはFixnumとBignum、2つの整数クラスがありました。
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Ruby 2.4では従来抽象クラスであったIntegerクラスにこの2つを統合しています。
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FixnumクラスやBignumクラスを扱う全てのC拡張ライブラリは修正が必要になります。
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詳細は [Redmineチケット](https://bugs.ruby-lang.org/issues/12005) や [RubyKaigiでの発表](http://www.a-k-r.org/pub/2016-09-08-rubykaigi-unified-integer.pdf)を参照ください。
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## [String supports Unicode case mappings](https://bugs.ruby-lang.org/issues/10085)
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`String/Symbol#upcase/downcase/swapcase/capitalize(!)` は従来ASCIIの範囲でのみ大文字小文字を変換していましたが、Ruby 2.4ではUnicodeの仕様にのっとった変換を行うようになります。
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## Performance improvements
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Ruby 2.4 では以下のような言語レベルでの修正を伴う性能改善が行われています。
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### [Array#max, Array#min](https://bugs.ruby-lang.org/issues/12172)
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一定の条件下において、`[x, y].max` や `[x, y].min` が一時的な配列を生成しないようになりました。
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### [Regexp#match?](https://bugs.ruby-lang.org/issues/8110)
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バックリファレンスの生成や `$~` の変更を行わないことで、極力オブジェクト生成を減らした `Regexp#match?` が追加されました。
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### Other performance improvements
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* [speed up instance variable access](https://bugs.ruby-lang.org/issues/12274)
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## Debugging
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### [Thread#report_on_exception and Thread.report_on_exception](https://bugs.ruby-lang.org/issues/6647)
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Rubyでは、あるスレッドで発生した例外は、別のスレッドに join されない限り無視されます。
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Ruby 2.4 で `report_on_exception = true` を行うと、あるスレッドが例外で終了した場合、標準エラー出力にその旨が出力されます。
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Ruby 2.5 において `report_on_exception` のデフォルトの値がどうあるべきか、ある正常終了したスレッドがGCされた場合に通知する機能も必要かなどについてご意見をお持ちの方はお知らせください。
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### [Thread deadlock detection now shows threads with their backtrace and dependency](https://bugs.ruby-lang.org/issues/8214)
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Rubyにはスレッド待ちのデッドロックを検出する機能がありましたが、その際のエラー出力はデバッグのための十分な情報を出していませんでした。Ruby 2.4ではスレッドのバックトレースや依存関係などを出力します。
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## Other notable changes since 2.3
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* Support OpenSSL 1.1.0 (drop support for 0.9.7 or prior)
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* ext/tk is now removed from stdlib [Feature #8539](https://bugs.ruby-lang.org/issues/8539)
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* XMLRPC is now removed from stdlib [Feature #12160](https://bugs.ruby-lang.org/issues/12160)
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See [NEWS](https://github.com/ruby/ruby/blob/v2_4_0_preview3/NEWS)
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and [ChangeLog](https://github.com/ruby/ruby/blob/v2_4_0_preview3/ChangeLog)
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for details.
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With those changes,
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[2470 files changed, 283051 insertions(+), 64902 deletions(-)](https://github.com/ruby/ruby/compare/v2_3_0...v2_4_0_preview3)
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since Ruby 2.3.0!
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メリークリスマス。Ruby とともに良き休日をおすごしください。
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## Download
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* <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0.tar.bz2>
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SIZE: 12572424 bytes
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SHA1: 944d2588308391b20a89642472454d1dfe7b2360
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SHA256: 440bbbdc49d08d3650f340dccb35986d9399177ad69a204def56e5d3954600cf
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SHA512: bef7bb53f63fb74073d071cc125fb67b273ed0779ef43c2d2969089b9ca21fff1bd012281c5b748f7a3c24dd26e71730d7248c05a01cb23ab2089eb4d02115fe
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* <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0.tar.gz>
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SIZE: 14104044 bytes
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SHA1: d44a3c50a0e742341ed3033d5db79d865151a4f4
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SHA256: 152fd0bd15a90b4a18213448f485d4b53e9f7662e1508190aa5b702446b29e3d
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SHA512: 21c9f596b42dd9cba7a53963a59fed0c2e0c1eb960a4ac7087ea3eaa991ce9252d32639e1edcb75b1d709bc07c4820a6dc336ab427d0643c6e6498e0eacdbc8b
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* <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0.tar.xz>
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SIZE: 9906880 bytes
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SHA1: 038804bbd0e77508dd2510b729a9f3b325489b2e
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SHA256: 3a87fef45cba48b9322236be60c455c13fd4220184ce7287600361319bb63690
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SHA512: 975a5388592adc038461e0acebb6c0efee242891b2ea8621476401458efe2bc0fdd317d3bf99beb745b0b3808410efdff33862da29c95c027f457943721e3ab6
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* <https://cache.ruby-lang.org/pub/ruby/2.4/ruby-2.4.0.zip>
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SIZE: 15758757 bytes
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SHA1: 29e1bab11551011718c35a51827edcb55bd656fc
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SHA256: 5c2bbfa26fd6a15a2d70961874b0f3a386206fcc5f698e240dd8b0c9f0f18c5e
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SHA512: 31d932372ce490eeac0a70bc8dcf842909a90435422398d069c05cf01d994936064b8f4e60879e28a8655c1296eb8e180e348cb95e001ed6ca73cda0ff77de23

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