Ruby 2.3.0 Released

Author: nurse

en/news/_posts/2015-12-25-ruby-2-3-0-released.md

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+---
+layout: news_post
+title: "Ruby 2.3.0 Released"
+author: "naruse"
+translator:
+date: 2015-12-25 00:00:00 +0000
+lang: en
+---
+
+We are pleased to announce the release of Ruby 2.3.0.
+
+This is the first stable release of Ruby 2.3 series.
+It introduces many new features and improvements for example:
+
+A [Frozen String Literal Pragma](https://bugs.ruby-lang.org/issues/11473)
+is introduced.
+With Ruby 2.1, `"str".freeze` has been optimized to reduce object allocation.
+Ruby 2.3 introduces a new magic comment and command line option to
+freeze all string literals in the source files.
+Additionally for debugging, you can get where the object is created on
+`"can't modify frozen String"` error by
+`--debug=frozen-string-literal` command line option.
+
+A [safe navigation operator](https://bugs.ruby-lang.org/issues/11537)
+([so-called lonely operator](https://instagram.com/p/-M9l6mRPLR/)) `&.`,
+which already exists in C#, Groovy, and Swift, is introduced to ease
+`nil` handling as `obj&.foo`. `Array#dig` and `Hash#dig` are also added.
+Note that this behaves as [try! of ActiveSupport](http://apidock.com/rails/Object/try%21),
+which specially handle only nil.
+
+The [did_you_mean gem is bundled](https://bugs.ruby-lang.org/issues/11252).
+The did_you_mean gem
+shows the candidates on the `NameError` and `NoMethodError` to ease
+debugging.
+
+[RubyVM::InstructionSequence#to_binary and .load_from_binary](https://bugs.ruby-lang.org/issues/11788) are introduced as experimental feature. With these features, we can make a ISeq (bytecode) pre-compilation system.
+
+Ruby 2.3 includes many performance tuning fixes.
+For example,
+[reconsider method entry data structure](https://bugs.ruby-lang.org/issues/11278),
+[introducing new table data structure](https://bugs.ruby-lang.org/issues/11420),
+[optimize Proc#call](https://bugs.ruby-lang.org/issues/11569),
+machine code level tuning for object allocation and method calling code,
+and other many optimizations.
+
+For a complete list of new features and compatibility notes, please see
+[NEWS](https://github.com/ruby/ruby/blob/v2_3_0/NEWS) and
+[ChangeLog](https://github.com/ruby/ruby/blob/v2_3_0/ChangeLog).
+
+With those changes, [1097 files changed, 97466 insertions(+), 58685 deletions(-)](https://github.com/ruby/ruby/compare/v2_2_0...v2_3_0) since Ruby 2.2.0!
+
+## Download
+
+* <https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview2.tar.bz2>
+  * SIZE:   14126752 bytes
+  * SHA1:   7e717ef7a0a1523ad696b5fe693f7f7a613a3810
+  * SHA256: e9b0464e50b2e5c31546e6b8ca8cad71fe2d2146ccf88b7419bbe9626af741cb
+  * SHA512: e397f321d4338edba8d005d871408775f03d975da90c8abcfdb457a1bc7e6c87efe58c53b2c3bc122e9f58f619767b271bcc8d5d9663ed4b4288c60556e8d288
+* <https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview2.tar.gz>
+  * SIZE:   17623519 bytes
+  * SHA1:   2deaf3ccbbfc5e08d3d840a4f1c33ff5f62f931d
+  * SHA256: cb1c745bda33ba9e812b48c87852571ef6486f985c5e6ff4508a137d1c9734a3
+  * SHA512: 83022f99775eb139beec281d59029dcc7c59de1e313182685b0a785334ac53d0c445212460d00d065169b922949263f30a1f981e19fc6e59814e79e6e53ae8e0
+* <https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview2.tar.xz>
+  * SIZE:   11249780 bytes
+  * SHA1:   e1dfca06cd3c2cf6456a7feb0b1cd0752bde1a3b
+  * SHA256: 7c3119268af87c137f415301b299281762453ad78f86e35562be014dabd67b11
+  * SHA512: ab3376145d95a2188e6345984f0e5592c8d33515d7046a2ab2565dc418fa2306cdcf797aae9494d4d10446ada54ba638d8a8ad2d4b7510544d7eaea3de4faa87
+* <https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview2.zip>
+  * SIZE:   19841531 bytes
+  * SHA1:   db7fa5291d90e0a9c6f75c0cd068bc54050520d6
+  * SHA256: 90d036fd1ec40aa8f5493821ac162bf69f505c5977db54afe53b8bf689d79b9d
+  * SHA512: 05784df420018aaae7d09d41e872df708e861cacc74dc8ee97a9e3ac7458cb12b937523ad6def34d5ae2890a0cf037a8d61e365beb88d28acd84879b9391ad65