~/talk

Back to the roots of date

Talkat RubyKaigi 2026 · 2026-04-22..04-24· [ruby, web-platform]
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Pure‑Ruby gem ruby-date rewrites the C Date implementation (first commit Jan 10, tests green Feb 11) by porting and reimplementing Date._parse and other methods with AI assistance; initial ports pass tests but run at only ~20–50% of C speed, fail a regex performance test involving a year with 100,000 zeros until requiring Ruby 3.3, then regain speed with YJIT and a new integer_at API; PR remains under heavy review, work-in-progress but functional.

AI-written summary · about

  1. 0:00Introduction
  2. 2:23Speaker introduction
  3. 3:50Ruby’s date library issues
  4. 9:56Creating ruby-date gem
  5. 15:18DateTime pitfalls
  6. 17:34Regex performance challenge
  7. 20:42Pull request and benchmarks
  8. 25:47Optimization with YJIT
  9. 29:57Latest review progress
  10. 30:42Conclusion and future
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