Ruby 4.0.0 Released

66 points by havenwood

zverok

The annotated, explained changelog from my Ruby Changes project.

As per the project goals statement:

Full: unlike most "What's new in Ruby x.y?" blog posts, the information here targets to cover all the NEWS file of the current Ruby version (with the accent on the language changes, not internal/implementation changes, of which this year were plenty);
Comprehensive: unlike the NEWS file itself (and most of blog-posts, too), the site provides full context for each change:
- Where and how it was discussed;
- Related documentation at ruby-doc.org;
- Code examples;
- Reasoning for the change, if known.
Concise: given the two goals above, content still tries to stay short and focused so the changes can be quickly navigated through;
Well-structured: both regarding order/explanations of each particular change, and design of the site, it is intended to be easily and logically navigated.
Open: the source of the changelog is available on GitHub and is open for fixes and suggestions.

rsanheim

Love the simple, boring dev focused improvements: smarter backtraces, moving pathname and set into core, “ #instance_variables_to_inspect ”, ruby top level constant, and of course ZIT. it looks like ZIT will be the future of continual performance improvements we’ve seen with every major ruby version bump.

I still don’t really understand the concurrency story with ractors and fibers, I really wish there was something more first class like actors or goroutines/channels. But it’s fine, I use concurrent-ruby for complex things or parallel ruby for simple stuff.l

The biggest improvement I want is multi platform distribution via whatever means required, and faster bundler. Those are really hurting more as command line tools become even more important in this ai/agentic age.

schneems

Aaron pushed some perf updates to Bundler recently.

multi platform distribution

What do you mean exactly? Like precompile gems for multiple platforms or you mean the app itself?
- aae
  
  I think they're referring to rv without referring to rv
jptsh

I haven't written anything of substance in Ruby in 15 years; at the time I found some things about it irritating & never gave it a second chance. My taste has evolved & it'd be nice to give it another shot on a side project sometime. I'm curious if long-time Ruby users have an opinion about a nice framework/library to accompany a side project. Any CLI/TUI library, game/GUI library, or web framework that is nice to work with & feels very Ruby-as-it-is-written-in-2025? (Or is the best answer just Rails? I would ideally find something smaller?)
- ChaelCodes
  
  For games, DragonRuby is a good choice. It ships with some tutorial games.
- brudish
  
  It really depends on what you're building. You can do a lot in vanilla Ruby, but depending on what you're building there are a wide variety of gems to support it. I'm a big fan (and I don't think this is a particularly unique take) of eschewing Rails wherever possible.
- sarna
  
  As far as Rails replacements go, many people these days use Roda, Bridgetown, or Hanami.
  
  For CLI/TUI there's https://ttytoolkit.org/ but I didn't use it much, honestly.
schneems

Available on Heroku https://devcenter.heroku.com/changelog-items/3521
lpil

These are some really lovely sounding improvements. I’ve not used Ruby in some time, but I still really enjoy reading about some old bugbears of mine being resolved.