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‎ko/news/_posts/2023-05-12-ruby-3-3-0-preview1-released.md

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---
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layout: news_post
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title: "Ruby 3.3.0-preview1 Released"
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author: "naruse"
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translator:
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date: 2023-05-12 00:00:00 +0000
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lang: en
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---
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{% assign release = site.data.releases | where: "version", "3.3.0-preview1" | first %}
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We are pleased to announce the release of Ruby {{ release.version }}. Ruby 3.3 adds a new pure-Ruby JIT compiler named RJIT, uses Lrama as a parser generator, and many performance improvements especially YJIT.
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## RJIT
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* Introduced a pure-Ruby JIT compiler RJIT and replaced MJIT.
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* RJIT supports only x86\_64 architecture on Unix platforms.
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* Unlike MJIT, it doesn't require a C compiler at runtime.
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* RJIT exists only for experimental purposes.
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* You should keep using YJIT in production.
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* If you are interested in developing JIT for Ruby, please check out [k0kubun's presentation on Day 3 of RubyKaigi](https://rubykaigi.org/2023/presentations/k0kubun.html#day3).
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## Use Lrama instead of Bison
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* Replace Bison with [Lrama LALR parser generator](https://github.com/yui-knk/lrama) [Feature #19637](https://bugs.ruby-lang.org/issues/19637)
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* If you have interest, please see [The future vision of Ruby Parser](https://rubykaigi.org/2023/presentations/spikeolaf.html)
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## YJIT
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* Significant performance improvements over 3.2
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* Splat and rest arguments support has been improved.
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* Registers are allocated for stack operations of the virtual machine.
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* More calls with optional arguments are compiled.
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* `Integer#!=`, `String#!=`, `Kernel#block_given?`, `Kernel#is_a?`,
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`Kernel#instance_of?`, `Module#===` are specially optimized.
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* Instance variables no longer exit to the interpreter
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with megamorphic Object Shapes.
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* Metadata for compiled code uses a lot less memory.
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* Improved code generation on ARM64
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* Option to start YJIT in paused mode and then later enable it manually
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* `--yjit-pause` and `RubyVM::YJIT.resume`
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* This can be used to enable YJIT only once your application is done booting
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* Exit tracing option now supports sampling
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* `--trace-exits-sample-rate=N`
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* Multiple bug fixes
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## Other Notable New Features
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### Language
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## Performance improvements
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* `defined?(@ivar)` is optimized with Object Shapes.
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## Other notable changes since 3.2
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## Compatibility issues
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Note: Excluding feature bug fixes.
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### Removed constants
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The following deprecated constants are removed.
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### Removed methods
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The following deprecated methods are removed.
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## Stdlib compatibility issues
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### `ext/readline` is retired
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* We have `reline` that is pure Ruby implementation compatible with `ext/readline` API. We rely on `reline` in the future. If you need to use `ext/readline`, you can install `ext/readline` via rubygems.org with `gem install readline-ext`.
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* We no longer need to install libraries like `libreadline` or `libedit`.
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## C API updates
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### Updated C APIs
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The following APIs are updated.
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### Removed C APIs
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The following deprecated APIs are removed.
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## Standard library updates
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The following default gems are updated.
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* RubyGems 3.5.0.dev
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* bigdecimal 3.1.4
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* bundler 2.5.0.dev
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* csv 3.2.7
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* fiddle 1.1.2
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* fileutils 1.7.1
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* irb 1.6.4
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* optparse 0.4.0.pre.1
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* psych 5.1.0
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* reline 0.3.3
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* stringio 3.0.7
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* strscan 3.0.7
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* syntax_suggest 1.0.4
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* time 0.2.2
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* timeout 0.3.2
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* uri 0.12.1
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The following bundled gems are updated.
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* minitest 5.18.0
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* rbs 3.1.0
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* typeprof 0.21.7
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* debug 1.8.0
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See GitHub releases like [Logger](https://github.com/ruby/logger/releases) or
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changelog for details of the default gems or bundled gems.
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See [NEWS](https://github.com/ruby/ruby/blob/{{ release.tag }}/NEWS.md)
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or [commit logs](https://github.com/ruby/ruby/compare/v3_2_0...{{ release.tag }})
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for more details.
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With those changes, [{{ release.stats.files_changed }} files changed, {{ release.stats.insertions }} insertions(+), {{ release.stats.deletions }} deletions(-)](https://github.com/ruby/ruby/compare/v3_2_0...{{ release.tag }}#file_bucket)
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since Ruby 3.2.0!
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## Download
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* <{{ release.url.gz }}>
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SIZE: {{ release.size.gz }}
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SHA1: {{ release.sha1.gz }}
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SHA256: {{ release.sha256.gz }}
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SHA512: {{ release.sha512.gz }}
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* <{{ release.url.xz }}>
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SIZE: {{ release.size.xz }}
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SHA1: {{ release.sha1.xz }}
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SHA256: {{ release.sha256.xz }}
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SHA512: {{ release.sha512.xz }}
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* <{{ release.url.zip }}>
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SIZE: {{ release.size.zip }}
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SHA1: {{ release.sha1.zip }}
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SHA256: {{ release.sha256.zip }}
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SHA512: {{ release.sha512.zip }}
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## What is Ruby
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Ruby was first developed by Matz (Yukihiro Matsumoto) in 1993,
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and is now developed as Open Source. It runs on multiple platforms
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and is used all over the world especially for web development.

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