6. Ruby 3.1.0 Released

Ruby 3.1.0 Released


  • We are pleased to announce the release of Ruby 3.1.0. Ruby 3.1 keeps compatibility with Ruby 3.0 and also adds many features.

    YJIT: New experimental in-process JIT compiler

    Ruby 3.1 merges YJIT, a new in-process JIT compiler developed by Shopify.

    Since Ruby 2.6 introduced MJIT in 2018, its performance greatly improved, and finally we achieved Ruby3x3 last year. But even though Optcarrot has shown impressive speedups, the JIT hasn’t benefited real world business applications.

    Recently Shopify contributed many Ruby improvements to speed up their Rails application. YJIT is an important contribution, and aims to improve the performance of Rails applications.

    Though MJIT is a method-based JIT compiler and uses an external C compiler, YJIT uses Basic Block Versioning and includes JIT compiler inside it. With Lazy Basic Block Versioning (LBBV) it first compiles the beginning of a method, and incrementally compiles the rest when the type of arguments and variables are dynamically determined. See YJIT: a basic block versioning JIT compiler for CRuby for a detailed introduction.

    With this technology, YJIT achieves both fast warmup time and performance improvements on most real-world software, up to 22% on railsbench, 39% on liquid-render.

    YJIT is still an experimental feature, and as such, it is disabled by default. If you want to use this, specify the --yjit command-line option to enable YJIT. It is also limited to Unix-like x86-64 platforms for now.

    • https://bugs.ruby-lang.org/issues/18229
    • https://shopify.engineering/yjit-just-in-time-compiler-cruby
    • https://www.youtube.com/watch?v=PBVLf3yfMs8

    debug gem: A new debugger

    A completely rewritten debugger debug.gem is bundled. debug.gem has the following features:

    • Improve the debugging performance (it does not slow down the application even with the debugger)
    • Support remote debugging
    • Support rich debugging frontend (VSCode and Chrome browser are supported now)
    • Support multi-process/multi-thread debugging
    • Colorful REPL
    • And other useful features like recod & replay feature, tracing feature and so on.

    Ruby had bundled lib/debug.rb, but it was not well maintained and it had issues about performance and features. debug.gem replaced lib/debug.rb completely.

    error_highlight: Fine-grained error location in backtrace

    A built-in gem, error_highlight, has been introduced. It includes fine-grained error location in backtrace:

    $ ruby test.rb
test.rb:1:in `<main>': undefined method `time' for 1:Integer (NoMethodError)

1.time {}
 ^^^^^
Did you mean?  times

    Currently, only NameError is supported.

    This gem is enabled by default. You can disable it by using a command-line option --disable-error_highlight. See the repository in detail.

    IRB Autocomplete and Document Display

    The IRB now has an autocomplete feature, where you can just type in the code, and the completion candidates dialog will appear. You can use Tab and Shift+Tab to move up and down.

    If documents are installed when you select a completion candidate, the documentation dialog will appear next to the completion candidates dialog, showing part of the content. You can read the full document by pressing Alt+d.

    Other Notable New Features

    Language

    • Values in Hash literals and keyword arguments can be omitted. [Feature #14579]
      • {x:, y:} is a syntax sugar of {x: x, y: y}.
      • foo(x:, y:) is a syntax sugar of foo(x: x, y: y).
    • Pin operator in pattern matching now takes an expression. [Feature #17411]
    Prime.each_cons(2).lazy.find_all{_1 in [n, ^(n + 2)]}.take(3).to_a
#=> [[3, 5], [5, 7], [11, 13]]
    • Parentheses can be omitted in one-line pattern matching. [Feature #16182]
    [0, 1] => _, x
{y: 2} => y:
x #=> 1
y #=> 2

    RBS

    RBS is a language to describe the structure of Ruby programs. See the repository for details.

    Updates since Ruby 3.0.0:

    • Generic type parameters can be bounded. (PR)
    • Generic type aliases are supported. (PR)
    • rbs collection has been introduced to manage gems’ RBSs. (doc)
    • Many signatures for built-in and standard libraries have been added/updated.
    • It includes many bug fixes and performance improvements too.

    See the CHANGELOG.md for more information.

    TypeProf

    TypeProf is a static type analyzer for Ruby. It generates a prototype of RBS from non-type-annotated Ruby code. See the document for detail.

    The main updates since Ruby 3.0.0 is an experimental IDE support called “TypeProf for IDE”.

    Demo of TypeProf for IDE

    The vscode extension shows a guessed (or explicitly written in a RBS file) method signature above each method definition, draws a red underline under the code that may cause a name error or type error, and completes method names (i.e., shows method candidates). See the document in detail.

    Also, the release includes many bug fixes and performance improvements.

    Performance improvements

    • MJIT
      • For workloads like Rails, the default --jit-max-cache is changed from 100 to 10000. The JIT compiler no longer skips compilation of methods longer than 1000 instructions.
      • To support Zeitwerk of Rails, JIT-ed code is no longer cancelled when a TracePoint for class events is enabled.

    Other notable changes since 3.0

    • One-line pattern matching, e.g., ary => [x, y, z], is no longer experimental.
    • Multiple assignment evaluation order has been changed slightly. [Bug #4443]
      • foo[0], bar[0] = baz, qux was evaluated in order baz, qux, foo, and then bar in Ruby 3.0. In Ruby 3.1, it is evaluated in order foo, bar, baz, and then qux.

    • Variable Width Allocation: Strings (experimental) [Bug #18239]

    • Psych 4.0 changes Psych.load as safe_load by the default. You may need to use Psych 3.3.2 for migrating to this behavior. [Bug #17866]

    Standard libraries updates

    • The following default gem are updated.
      • RubyGems 3.3.3
      • base64 0.1.1
      • benchmark 0.2.0
      • bigdecimal 3.1.1
      • bundler 2.3.3
      • cgi 0.3.1
      • csv 3.2.2
      • date 3.2.2
      • did_you_mean 1.6.1
      • digest 3.1.0
      • drb 2.1.0
      • erb 2.2.3
      • error_highlight 0.3.0
      • etc 1.3.0
      • fcntl 1.0.1
      • fiddle 1.1.0
      • fileutils 1.6.0
      • find 0.1.1
      • io-console 0.5.9
      • io-wait 0.2.1
      • ipaddr 1.2.3
      • irb 1.4.1
      • json 2.6.1
      • logger 1.5.0
      • net-http 0.2.0
      • net-protocol 0.1.2
      • nkf 0.1.1
      • open-uri 0.2.0
      • openssl 3.0.0
      • optparse 0.2.0
      • ostruct 0.5.2
      • pathname 0.2.0
      • pp 0.3.0
      • prettyprint 0.1.1
      • psych 4.0.3
      • racc 1.6.0
      • rdoc 6.4.0
      • readline 0.0.3
      • readline-ext 0.1.4
      • reline 0.3.0
      • resolv 0.2.1
      • rinda 0.1.1
      • ruby2_keywords 0.0.5
      • securerandom 0.1.1
      • set 1.0.2
      • stringio 3.0.1
      • strscan 3.0.1
      • tempfile 0.1.2
      • time 0.2.0
      • timeout 0.2.0
      • tmpdir 0.1.2
      • un 0.2.0
      • uri 0.11.0
      • yaml 0.2.0
      • zlib 2.1.1
    • The following bundled gems are updated.
      • minitest 5.15.0
      • power_assert 2.0.1
      • rake 13.0.6
      • test-unit 3.5.3
      • rexml 3.2.5
      • rbs 2.0.0
      • typeprof 0.21.1
    • The following default gems are now bundled gems. You need to add the following libraries to Gemfile under the bundler environment.
      • net-ftp 0.1.3
      • net-imap 0.2.2
      • net-pop 0.1.1
      • net-smtp 0.3.1
      • matrix 0.4.2
      • prime 0.1.2
      • debug 1.4.0

    See NEWS or commit logs for more details.

    With those changes, 3124 files changed, 551760 insertions(+), 99167 deletions(-) since Ruby 3.0.0!

    Merry Christmas, Happy Holidays, and enjoy programming with Ruby 3.1!

    Download

    • https://cache.ruby-lang.org/pub/ruby/3.1/ruby-3.1.0.tar.gz

      SIZE: 20103517
SHA1: e4e8c20dd2a1fdef4d3e5bd5a3461000dd17f226
SHA256: 50a0504c6edcb4d61ce6b8cfdbddaa95707195fab0ecd7b5e92654b2a9412854
SHA512: 76009d325e961e601d9a287e36490cbc1f3b5dbf4878fa6eab2c4daa5ff2fed78cbc7525cd87b09828f97cbe2beb30f528928bcc5647af745d03dffe7c5baaa9

    • https://cache.ruby-lang.org/pub/ruby/3.1/ruby-3.1.0.tar.xz

      SIZE: 14709096
SHA1: 92b603c2a69fb25d66c337a63e94280984edea11
SHA256: 1a0e0b69b9b062b6299ff1f6c6d77b66aff3995f63d1d8b8771e7a113ec472e2
SHA512: a2bb6b5e62d5fa06dd9c30cf84ddcb2c27cb87fbaaffd2309a44391a6b110e1dde6b7b0d8c659b56387ee3c9b4264003f3532d5a374123a7c187ebba9293f320

    • https://cache.ruby-lang.org/pub/ruby/3.1/ruby-3.1.0.zip

      SIZE: 24388179
SHA1: e37435956d6f840a0e8758d7374bc7e0e346105f
SHA256: a3bfcd486d09c065d46421da0ff3d430ce4423fefd80cea63c6595d83ae4af0e
SHA512: 67db71144e06da2c1c25eaf413d1417c99a4b18738a573f9e3371c11ea242eee9dcbdc3de17336f25ab5060039fe034e57298943d344be9cd9eb33bb56e2e1c6

    What is Ruby

    Ruby was first developed by Matz (Yukihiro Matsumoto) in 1993, and is now developed as Open Source. It runs on multiple platforms and is used all over the world especially for web development.

    Posted by naruse on 25 Dec 2021



    https://www.ruby-lang.org/en/news/2021/12/25/ruby-3-1-0-released/
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