Ruby 4.0.0 Preview2

kept by eddie nov 19, 25

Ruby 4.0.0 preview2 introduces Unicode 17.0 support, an experimental ZJIT compiler, and language changes like `*nil` no longer calling `nil.to_a`.

Ruby Programming Language
Ruby's redesigned homepage highlights the language's fun, readable syntax, rich gem ecosystem, and supportive community through testimonials from Matz, DHH, and others.
also on Yukihiro Matsumoto, Ruby, #programming-languages, #open-source
What's new in Ruby 4.0
Ruby 4.0 ships Christmas 2025 with a new ZJIT compiler, redesigned Ractor ports, experimental isolated namespaces via Ruby::Box, and faster object allocations.
also on YJIT, Ruby, #programming-languages
Response to "Ruby Is Not a Serious Programming Language"
Ruby's value lies in prioritizing programmer joy and expressiveness over technical metrics, enabling business success despite critiques about its seriousness.
also on Ruby, Shopify, #programming-languages, #developer-tools
Shopify/liquid: Performance: 53% faster parse+render, 61% fewer allocations
Shopify CEO Tobias Lütke used the autoresearch pattern with a coding agent to achieve 53% faster parse+render and 61% fewer allocations in the Liquid template engine.
also on Ruby, Shopify, #open-source, #developer-tools
Pi, Minimal and Performant
Pi's minimal coding harness improves cost and performance by using fewer tools and less context, validated by Databricks' benchmark and Shopify's extensible pi-autoresearch extension.
also on Shopify, #open-source, #developer-tools