<h1>Ruby 3.4.0 Released: Key Features and Improvements</h1>
Ruby 3.4.0 brings a wealth of new features and enhancements that aim to improve the developer experience and performance of the language. Here are the key highlights of this release:
<h2>Key Features and Improvements</h2>
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‘it’ Block Parameter Reference: Developers can now use <code>it</code> as a block parameter reference without having to specify a variable name. This feature simplifies the syntax and improves code readability.
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Prism as Default Parser: Prism has replaced <code>RubyVM::AbstractSyntaxTree</code> as the default parser, offering better performance and more accurate parsing.
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Happy Eyeballs Version 2: The socket library now supports Happy Eyeballs Version 2, improving connectivity performance and reliability in network applications.
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Enhanced YJIT Performance: The YJIT (Yet Another Ruby JIT) has received significant performance improvements, making Ruby 3.4.0 faster for Just-in-Time compilation tasks.
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Modular Garbage Collector: A modular garbage collector has been introduced, which improves memory management efficiency and application performance. Major Garbage Collection has been disabled by default, contributing to these advancements.
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<h2>Notable Updates</h2>
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Core Classes and Standard Libraries: Several core classes and standard libraries have been updated. For example, key methods in the <code>Array</code> class have been rewritten for better performance, while the <code>Hash</code> and <code>Pathname</code> classes also get performance boosts.
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Deprecation Warnings: Deprecation warnings are now issued for mutated string literals without a <code>frozen_string_literal</code> comment. Warnings for unused method blocks in verbose mode have also been added.
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Keyword Splatting with <code>nil</code>: The language now supports keyword splatting with <code>nil</code>, adding more flexibility to method parameter handling.
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Memory Performance Improvements: Enhancements have been made to reduce memory usage in single and double splat arguments, contributing to overall efficiency.
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JSON Parsing: JSON parsing has been optimized, with notable improvements in version 2.8.0 making it faster than previous releases.
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REPL Type Completer: The Read-Eval-Print Loop (REPL) type completer is now bundled by default, offering developers an improved interactive coding experience.
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<h2>Compatibility Changes and Deprecations</h2>
This release also includes various compatibility changes and deprecations that developers should be aware of. For instance, the <code>frozen_string_literal</code> pragma will be removed in future versions, signaling a shift towards immutable string literals by default.
Overall, Ruby 3.4.0 marks a significant step forward in terms of performance, usability, and modern language features, reaffirming Ruby’s position as a preferred programming language for developers.

Collections

Ruby 3.4.0 introduces notable features and improvements, including the 'it' block parameter reference for simpler syntax, Prism as the default parser for better performance, and the Happy Eyeballs Version 2 for improved network connectivity. Significant enhancements to YJIT and memory performance, updates to core classes and standard libraries, along with new deprecation warnings and keyword splatting with `nil`, contribute to its elevated performance and usability.

Ruby 3.4.0 Released with Key Features and Performance Enhancements