Ruby 2.3.0-preview2 Released

Posted by naruse on 11 Dec 2015

We are pleased to announce the release of Ruby 2.3.0-preview2.

Ruby 2.3.0-preview2 is the second preview of Ruby 2.3.0. Many new features and improvements are included.

A Frozen String Literal Pragma 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 using the --debug=frozen-string-literal command line option.

A safe navigation operator (so-called lonely operator) &., 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.

The did_you_mean gem is bundled. The did_you_mean gem shows the candidates on the NameError and NoMethodError to ease debugging.

RubyVM::InstructionSequence#to_binary and .load_from_binary are introduced as experimental features. With these features, we can make an ISeq (bytecode) pre-compilation system.

Ruby 2.3 includes many performance tuning fixes. For example, optimizing Proc#call, reconsidering method entry data structure, introducing new table data structure, machine code level tuning for object allocation and method calling code, and many other optimizations.

Try and enjoy programming with Ruby 2.3.0-preview2, and report us your knowledge!

Notable Changes since 2.2

See NEWS and ChangeLog for details.

With those changes, 1097 files changed, 97466 insertions(+), 58685 deletions(-) since Ruby 2.2.0!

Download

  • https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview2.tar.bz2

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  • https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview2.tar.gz

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  • https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview2.tar.xz

    • SIZE: 11249780 bytes
    • SHA1: e1dfca06cd3c2cf6456a7feb0b1cd0752bde1a3b
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  • https://cache.ruby-lang.org/pub/ruby/2.3/ruby-2.3.0-preview2.zip

    • SIZE: 19841531 bytes
    • SHA1: db7fa5291d90e0a9c6f75c0cd068bc54050520d6
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Release Comment

See also the release schedule and other information:

ReleaseEngineering23