Hacker News with Generative AI: Ruby

Fast Allocations in Ruby 3.5 (railsatscale.com)
Many Ruby applications allocate objects. What if we could make allocating objects six times faster? We can! Read on to learn more!

Ruby, Performance, Programming Languages, Optimization

252 points by tekknolagi 1 day ago | 62 comments

Fast Allocations in Ruby 3.5 (railsatscale.com)
Many Ruby applications allocate objects. What if we could make allocating objects six times faster? We can! Read on to learn more!

Ruby, Performance, Optimization

11 points by Ocha 2 days ago | 0 comments

SDB Scans the Ruby Stack Without the GVL (github.com/yfractal)

Ruby, Programming, Performance

30 points by ksec 4 days ago | 8 comments

What Is the Difference Between a Block, a Proc, and a Lambda in Ruby? (2013) (awaxman.com)
While it looks like these are all very similar, there are subtle differences that I will cover below.

Ruby, Programming Languages, Code, Development, Syntax

83 points by Tomte 5 days ago | 52 comments

Demystifying Ruby: It's all about threads (2024) (papey.fr)
Ruby is a dynamic, interpreted, open-source programming language known for its simplicity, productivity, and its “human-readable” syntax. Ruby is often used in web development, particularly with the Ruby on Rails framework. It supports object-oriented, functional, and imperative programming paradigms.

Ruby, Programming Languages, Web Development

78 points by kadrek 8 days ago | 6 comments

Coding agent in 94 lines of Ruby (radanskoric.com)
“It’s not that hard to build a fully functioning, code-editing agent.”

Programming, Ruby, Artificial Intelligence, Software Development, Code Generation

151 points by radanskoric 9 days ago | 84 comments

ZJIT has been merged into Ruby (railsatscale.com)
Following Maxime’s presentation at RubyKaigi 2025, the Ruby developers meeting, and Matz-san’s approval, ZJIT has been merged into Ruby. Hurray! In this post, we will give a high-level overview of the project, which is very early in development.

Ruby, Programming Languages, Open Source, Software Development, Performance

50 points by tekknolagi 9 days ago | 6 comments

Ruby 3.5 Feature: Namespace on read (ruby-lang.org)
This replaces #19744

Ruby, Programming Languages, New Releases

218 points by ksec 11 days ago | 107 comments

Show HN: A backend agnostic Ruby framework for building reactive desktop apps (codeberg.org)
A backend agnostic ruby framework for building reactive desktop applications

Ruby, Desktop Applications, Frameworks, Reactive Programming

92 points by zero-st4rs 14 days ago | 34 comments

CVE-2025-46336 (rack-session): Rack session gets restored after deletion (rubysec.com)
When using the Rack::Session::Pool middleware, simultaneous rack requests can restore a deleted rack session, which allows the unauthenticated user to occupy that session.

Security, Ruby, Web Development, Middleware

6 points by unripe_syntax 14 days ago | 0 comments

Unicorn Unix Magic Tricks (2014) (thorstenball.com)
Unicorn is a webserver written in Ruby for Rails and Rack applications. When I first used it I was amazed. This is magic, I thought. It had to be. Why?

Web Servers, Ruby, Rails, Programming

6 points by Tomte 21 days ago | 0 comments

The Unofficial Ruby Usage Guide (caliban.org)
You may be interested to know that this document was originally written for internal use in the Operations department at Google.

Ruby, Programming Languages, Software Development, Guides

18 points by Tomte 21 days ago | 1 comments

Fast(er) regular expression engines in Ruby (serpapi.com)
Performance-oriented comparison of alternative regexp engines that may (or may not) speed up your Ruby code.

Ruby, Regular Expressions, Performance, Optimization

60 points by davidsojevic 22 days ago | 6 comments

Creating beautiful charts with JRuby and JFreeChart (headius.com)
I recently returned from RubyKaigi where I had the opportunity to sit down with members of the Japanese Ruby community and show them a little bit of JRuby. One of the items that came up a few times was the difficulty of utilizing external libraries from Ruby: if it’s a C library, typically you have to either write a C extension or do the extra work of writing up an FFI binding.

Ruby, Charting, JRuby, Libraries

67 points by headius 23 days ago | 25 comments

Homebrew 4.5.0 (brew.sh)
Today, I’d like to announce Homebrew 4.5.0. The most significant changes since 4.4.0 are major improvements to brew bundle/services, preliminary Linux support for casks, official Support Tiers, Tier 2 ARM64 Linux support, Ruby 3.4 and several deprecations.

Software, New Releases, Linux, Homebrew, Ruby

17 points by chmaynard 24 days ago | 4 comments

Write an Interpreter in Ruby (speakerdeck.com)

Programming, Ruby, Interpreters

52 points by ksec 28 days ago | 2 comments

mruby 3.4.0 (mruby.org)
We are announcing the first stable release of mruby 3.4 series - mruby 3.4.0.

New Releases, Programming Languages, Ruby

13 points by shaicoleman 29 days ago | 0 comments

RubyKaigi: Empowering Developers with HTML-Aware ERB Tooling (speakerdeck.com)
ERB tooling has lagged behind modern web development needs, especially with the rise of Hotwire and HTML-over-the-wire. Discover a new HTML-aware ERB parser that unlocks advanced developer tools like formatters, linters, and LSP integrations, enhancing how we build and ship HTML in our Ruby applications.

Ruby, Web Development, Programming Languages, Development Tools, Hotwire

4 points by ksec 31 days ago | 0 comments

Show HN: I built a Ruby gem that handles memoization with a ttl (github.com/mishalzaman)
MemoTTL is a thread-safe memoization utility for Ruby that supports TTL (Time-To-Live) and LRU (Least Recently Used) eviction.

Ruby, Programming, Software, Memoization, Caching

48 points by hp_hovercraft84 31 days ago | 26 comments

Blogging with Ruby, Middleman and Tailwind CSS (harrisonbroadbent.com)
You probably haven’t heard of Middleman, a Ruby static site generator.

Web Development, Ruby

8 points by hbroadbent 35 days ago | 0 comments

Ruby: Proposal to Upstream ZJIT (ruby-lang.org)
For the past 3 months, the YJIT team at Shopify has been working on a next-generation Ruby JIT, which we refer to as ZJIT. This new compiler is currently being developed in a private fork, with the hope that we can eventually upstream it into ruby/ruby. Maxime Chevalier-Boisvert will give a talk at RubyKaigi 2025 to officially announce the project to the Ruby community and the broader public.

Ruby, Programming Languages, JIT Compilers, Open Source

9 points by ksec 35 days ago | 2 comments

JRuby 10 released with support for Ruby 3.4 (jruby.org)
The JRuby community is pleased to announce the release of JRuby 10.0.0.0.

New Releases, Programming Languages, Ruby, Java

12 points by headius 39 days ago | 3 comments

MonkeysPaw – A prompt-driven web framework in Ruby (worksonmymachine.substack.com)
Meet MonkeysPaw: a web framework where all the pages are prompts and what you see is whatever the LLM thinks you meant. Welcome to the first installment of “Works on Your Machine” where I’m sharing things that have graduated beyond just working on my machine.

Web Frameworks, Ruby, Generative AI

137 points by daviducolo 47 days ago | 28 comments

RubyUI (Former PhlexUI): Ruby Gem for RubyUI Components (github.com/ruby-ui)
Beautifully designed components that you can copy and paste into your apps. Accessible. Customizable. Open Source.

Ruby, Web Development, UI Libraries, Open Source, Programming

168 points by ksec 52 days ago | 39 comments

Ruby makes advanced CLI options easy (searls.co)
If you're not a "UNIX person", the thought of writing a command line application can be scary and off-putting.

Ruby, Programming, Software Development

12 points by thunderbong 55 days ago | 0 comments

The Gang of Four is wrong and you don't understand delegation (2012) (saturnflyer.com)
The Gang of Four got it wrong. Ruby's standard library has it wrong. Rails has it wrong.

Programming, Software Design, Ruby, Object-Oriented Programming

28 points by Tomte 58 days ago | 54 comments

Nōdo – Call Node.js from Ruby (github.com/mtgrosser)

Ruby, Node.js, Software, Programming Languages, Interoperability

8 points by namiwang 59 days ago | 0 comments

Exploring Ruby Ractors – I paid for for 10 cores I'm gonna use 10 cores (jpterry.com)
“I paid for 10 cores, I’m gonna use 10 cores!”

Ruby, Programming, Performance, Multithreading

15 points by todsacerdoti 61 days ago | 0 comments

Ruby, Ractors, and lock-free data structures (iliabylich.github.io)
This story is about concurrent data structures in the context of Ruby. The goal here is to demonstrate how true parallelism can be achieved with global mutable state (which at the time of writing, is not supported by built-in Ruby primitives).

Ruby, Programming Languages, Concurrency, Data Structures

138 points by ksec 61 days ago | 9 comments

Ratomic: Provides Mutable data structures for use with Ruby's Ractors (github.com/mperham)

Ruby, Programming, Data Structures, Concurrency

9 points by ksec 61 days ago | 2 comments