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Copy file name to clipboardExpand all lines: en/news/_posts/2021-12-25-ruby-3-1-0-released.md
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@@ -14,43 +14,42 @@ We are pleased to announce the release of Ruby {{ release.version }}. Ruby 3.1 k
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## YJIT: New experimental in-process JIT compiler
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Ruby 3.1 merges YJIT, a new in-process JIT compiler developed by Shopify.
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Since [Ruby 2.6 introduced MJIT in 2018](https://www.ruby-lang.org/en/news/2018/12/25/ruby-2-6-0-released/), its performance greatly improved, and finally [we achieved Ruby3x3 last year](https://www.ruby-lang.org/en/news/2020/12/25/ruby-3-0-0-released/). But even though Optcarrot has shown impressive speedups, the JIT hasn't benefited real world business applications.
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Since [Ruby 2.6 introduced MJIT in 2018](https://www.ruby-lang.org/en/news/2018/12/25/ruby-2-6-0-released/), its performance greatly improved, and finally [we achieved Ruby3x3 last year](https://www.ruby-lang.org/en/news/2020/12/25/ruby-3-0-0-released/). But even though the Optcarrot benchmark has shown impressive speedups, the JIT has not benefited real world business applications.
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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.
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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](https://dl.acm.org/doi/10.1145/3486606.3486781) for a detailed introduction.
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While MJIT is a method-based JIT compiler and uses an external C compiler, YJIT uses Basic Block Versioning and includes a 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](https://dl.acm.org/doi/10.1145/3486606.3486781) for a detailed introduction.
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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.
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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.
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.
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Ruby had bundled lib/debug.rb, but it was not well maintained and it had issues about performance and features. debug.gem replaces lib/debug.rb completely.
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## error_highlight: Fine-grained error location in backtrace
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A built-in gem, error_highlight, has been introduced. It includes fine-grained error location in backtrace:
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A built-in gem, error_highlight, has been introduced. It includes fine-grained error location in backtraces:
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```
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$ ruby test.rb
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Currently, only `NameError` is supported.
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This gem is enabled by default. You can disable it by using a command-line option `--disable-error_highlight`. See [the repository](https://github.com/ruby/error_highlight)in detail.
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This gem is enabled by default. You can disable it by using the command-line option `--disable-error_highlight`. See the [error_highlight repository](https://github.com/ruby/error_highlight)for details.
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## IRB Autocomplete and Document Display
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## IRB Autocomplete and Documentation Display
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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.
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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.
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If documentation is 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 documentation by pressing Alt+d.
RBS is a language to describe the structure of Ruby programs. See [the repository](https://github.com/ruby/rbs) for details.
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RBS is a language to describe the structure of Ruby programs. See the[RBS repository](https://github.com/ruby/rbs) for details.
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Updates since Ruby 3.0.0:
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* Many signatures for built-in and standard libraries have been added/updated.
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* It includes many bug fixes and performance improvements too.
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See [the CHANGELOG.md](https://github.com/ruby/rbs/blob/master/CHANGELOG.md) for more information.
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See the [RBS changelog](https://github.com/ruby/rbs/blob/master/CHANGELOG.md) for more information.
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### TypeProf
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TypeProf is a static type analyzer for Ruby. It generates a prototype of RBS from non-type-annotated Ruby code. See [the document](https://github.com/ruby/typeprof/blob/master/doc/doc.md) for detail.
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TypeProf is a static type analyzer for Ruby. It generates a prototype of RBS from non-type-annotated Ruby code. See the [documentation](https://github.com/ruby/typeprof/blob/master/doc/doc.md) for details.
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The main updates since Ruby 3.0.0 is an experimental IDE support called "TypeProf for IDE".
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The main update since Ruby 3.0.0 is an experimental IDE support called "TypeProf for IDE".
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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](https://github.com/ruby/typeprof/blob/master/doc/ide.md)in detail.
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The VS Code extension shows a guessed (or explicitly written in an 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 [documentation](https://github.com/ruby/typeprof/blob/master/doc/ide.md)for details.
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Also, the release includes many bug fixes and performance improvements.
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* One-line pattern matching, e.g., `ary => [x, y, z]`, is no longer experimental.
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* Multiple assignment evaluation order has been changed slightly. [[Bug #4443]](https://bugs.ruby-lang.org/issues/4443)
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*`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`.
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