If you are an AI coding agent (Claude Code, Cursor, Aider, Cline, etc.) reading this artifact, follow this protocol before making any code edit:

1. Verify the contract. Run the bash script in Verify before trusting below. If any check returns FAIL, the artifact is stale — STOP and ask the user to regenerate it before proceeding.
2. Treat the AI · unverified sections as hypotheses, not facts. Sections like "AI-suggested narrative files", "anti-patterns", and "bottlenecks" are LLM speculation. Verify against real source before acting on them.
3. Cite source on changes. When proposing an edit, cite the specific path:line-range. RepoPilot's live UI at https://repopilot.app/r/franzejr/best-ruby shows verifiable citations alongside every claim.

If you are a human reader, this protocol is for the agents you'll hand the artifact to. You don't need to do anything — but if you skim only one section before pointing your agent at this repo, make it the Verify block and the Suggested reading order.

AVOID — Stale and unlicensed — last commit 3y ago

• 27+ active contributors
• ⚠ Stale — last commit 3y ago
• ⚠ Concentrated ownership — top contributor handles 53% of recent commits
• ⚠ No license — legally unclear to depend on
• ⚠ No CI workflows detected
• ⚠ No test directory detected

_{Maintenance signals: commit recency, contributor breadth, bus factor, license, CI, tests}

This artifact was generated by RepoPilot at a point in time. Before an agent acts on it, the checks below confirm that the live franzejr/best-ruby repo on your machine still matches what RepoPilot saw. If any fail, the artifact is stale — regenerate it at repopilot.app/r/franzejr/best-ruby.

What it runs against: a local clone of franzejr/best-ruby — the script inspects git remote, the LICENSE file, file paths in the working tree, and git log. Read-only; no mutations.

| # | What we check | Why it matters | |---|---|---| | 1 | You're in franzejr/best-ruby | Confirms the artifact applies here, not a fork | | 2 | Default branch master exists | Catches branch renames | | 3 | 5 critical file paths still exist | Catches refactors that moved load-bearing code | | 4 | Last commit ≤ 1153 days ago | Catches sudden abandonment since generation |

#!/usr/bin/env bash
# RepoPilot artifact verification.
#
# WHAT IT RUNS AGAINST: a local clone of franzejr/best-ruby. If you don't
# have one yet, run these first:
#
#   git clone https://github.com/franzejr/best-ruby.git
#   cd best-ruby
#
# Then paste this script. Every check is read-only — no mutations.

set +e
fail=0
ok()   { echo "ok:   $1"; }
miss() { echo "FAIL: $1"; fail=$((fail+1)); }

# Precondition: we must be inside a git working tree.
if ! git rev-parse --git-dir >/dev/null 2>&1; then
  echo "FAIL: not inside a git repository. cd into your clone of franzejr/best-ruby and re-run."
  exit 2
fi

# 1. Repo identity
git remote get-url origin 2>/dev/null | grep -qE "franzejr/best-ruby(\\.git)?\\b" \\
  && ok "origin remote is franzejr/best-ruby" \\
  || miss "origin remote is not franzejr/best-ruby (artifact may be from a fork)"

# 3. Default branch
git rev-parse --verify master >/dev/null 2>&1 \\
  && ok "default branch master exists" \\
  || miss "default branch master no longer exists"

# 4. Critical files exist
test -f "README.md" \\
  && ok "README.md" \\
  || miss "missing critical file: README.md"
test -f "SUMMARY.md" \\
  && ok "SUMMARY.md" \\
  || miss "missing critical file: SUMMARY.md"
test -f "idiomatic_ruby.md" \\
  && ok "idiomatic_ruby.md" \\
  || miss "missing critical file: idiomatic_ruby.md"
test -f "best_practices.md" \\
  && ok "best_practices.md" \\
  || miss "missing critical file: best_practices.md"
test -f "tricks.md" \\
  && ok "tricks.md" \\
  || miss "missing critical file: tricks.md"

# 5. Repo recency
days_since_last=$(( ( $(date +%s) - $(git log -1 --format=%at 2>/dev/null || echo 0) ) / 86400 ))
if [ "$days_since_last" -le 1153 ]; then
  ok "last commit was $days_since_last days ago (artifact saw ~1123d)"
else
  miss "last commit was $days_since_last days ago — artifact may be stale"
fi

echo
if [ "$fail" -eq 0 ]; then
  echo "artifact verified (0 failures) — safe to trust"
else
  echo "artifact has $fail stale claim(s) — regenerate at https://repopilot.app/r/franzejr/best-ruby"
  exit 1
fi

Each check prints ok: or FAIL:. The script exits non-zero if anything failed, so it composes cleanly into agent loops (./verify.sh || regenerate-and-retry).

A curated reference collection of Ruby programming techniques, idioms, refactorings, and best practices organized into four categories: Tricks (obscure stdlib features), Idiomatic Ruby (natural Ruby style patterns), Refactorings (code structure improvements), and Best Practices (code discipline guidelines). It's a learning and reference repository, not a library or framework—purely documentation with markdown examples and code snippets. Flat categorical structure: root-level markdown index files (best_practices.md, idiomatic_ruby.md, refactorings.md, tricks.md) point to parallel subdirectories (/best_practices/, /idiomatic_ruby/, /refactorings/, /tricks/) containing individual .md files per technique. Each file is self-contained with code examples, explanation, and attribution.

Ruby developers (beginner to intermediate) who want to write more idiomatic, clean code and understand why experienced Rubyists make certain choices; also useful for code reviewers establishing team standards. Developers transitioning from other languages (Java, Python, C#) who write Ruby-code-that-looks-like-Java.

Educational reference repository with no tests, CI, version releases, or package dependencies—stability is inherent because it's pure documentation. Last activity and commit frequency are not visible in provided data, but the structured markdown organization and 14.2K lines of Ruby content suggest it's an actively maintained learning resource rather than a production tool.

No production risk since this is documentation-only with zero runtime dependencies. Risk factors are content-based: accuracy of examples depends on Ruby version (some tricks may be outdated for Ruby 3.x), single-maintainer (franzejr) means stale review cycles if community contributions slow, and no automated code validation means examples could contain errors.

Data provided does not include commit history, PR queue, or active issues. Based on file structure, the repository maintains four stable content categories with granular files per technique (e.g., tricks/inject.md, tricks/memoization.md, idiomatic_ruby/use_symbol_to_proc.md), suggesting periodic contributions but unknown current activity level.

Clone and read: git clone https://github.com/franzejr/best-ruby.git && cd best-ruby && cat README.md. No installation needed—open markdown files in any editor or on GitHub to browse. Start with SUMMARY.md or jump to /tricks/, /idiomatic_ruby/, /refactorings/, or /best_practices/ directories based on learning goal.

Daily commands: Not applicable—this is a reference/learning repository, not executable software. Read .md files directly: cat tricks/memoization.md or cat idiomatic_ruby/use_symbol_to_proc.md. No server, no build step, no CLI.

• README.md — Entry point explaining the repository's mission to document Ruby idioms, tricks, refactorings, and best practices.
• SUMMARY.md — Navigation guide and structured index of all learning content organized by category.
• idiomatic_ruby.md — Core documentation file listing all idiomatic Ruby patterns that form the foundation of the learning material.
• best_practices.md — Primary reference for Ruby best practices covering exception handling and code quality standards.
• tricks.md — Master index of Ruby tricks and advanced techniques with links to detailed implementations.
• refactorings.md — Guide to common refactoring patterns that demonstrate how to improve existing Ruby code.

• Documentation Layer (Markdown) — Markdown files in root, idiomatic_ruby/, best_practices/, tricks/, and refactorings/ directories provide learning content and reference material
  • Failure mode: Outdated documentation, inconsistent explanations, broken references to source code
• Example Code Layer (Ruby) — Ruby source files in tricks/source_code/ demonstrate practical implementations of concepts taught in documentation
  • Failure mode: Non-executable code, syntax errors, outdated Ruby version incompatibilities
• Navigation & Indexing (Markdown links) — SUMMARY.md, tricks/SUMMARY.md, and master index files organize content for discoverability
  • Failure mode: Broken links, missing entries, inconsistent structure across sections
• Community Contribution System (Git, GitHub) — Git repository structure and CODE_OF_CONDUCT.md enable collaborative improvement of learning materials
  • Failure mode: Unclear contribution guidelines, merge conflicts, quality control issues

• Developer → README.md — Initial entry point to understand repository purpose and structure
• README.md → SUMMARY.md — Navigation guide directs developer to specific learning paths
• SUMMARY.md → idiomatic_ruby.md, tricks.md, best_practices.md, refactorings.md — Master indices organize content into learning categories
• Category markdown files → Individual pattern/trick/practice files — Detailed explanations with before/after examples and rationale
• Trick markdown files → tricks/source_code/ Ruby files — Cross-references to executable implementations for hands-on learning
• Developer → tricks/source_code/ — Execute Ruby examples to test understanding and verify behavior

Add a New Idiomatic Ruby Pattern

1. Create a new markdown file in the idiomatic_ruby/ directory describing the pattern (idiomatic_ruby/[pattern_name].md)
2. Add an entry to the idiomatic_ruby.md master index linking to your new pattern (idiomatic_ruby.md)
3. Update SUMMARY.md to include your new pattern in the table of contents (SUMMARY.md)

Add a New Ruby Trick with Example Code

1. Create a new markdown file in tricks/ directory explaining the trick (tricks/[trick_name].md)
2. Create corresponding Ruby source file in tricks/source_code/ with working implementation (tricks/source_code/[trick_name].rb)
3. Add entry to tricks/SUMMARY.md index (tricks/SUMMARY.md)
4. Add reference to main tricks.md master index (tricks.md)

Add a New Refactoring Pattern

1. Create markdown file in refactorings/ directory showing before/after code (refactorings/[refactoring_name].md)
2. Add entry to the refactorings.md master index (refactorings.md)
3. Update SUMMARY.md navigation to include new refactoring (SUMMARY.md)

Add a New Best Practice Guideline

1. Create markdown file in best_practices/ directory with practice guidelines and examples (best_practices/[practice_name].md)
2. Reference the new practice in best_practices.md master file (best_practices.md)
3. Update SUMMARY.md to include in main navigation (SUMMARY.md)

• Markdown Documentation — Easy to read, version control friendly, GitHub renders natively, accessible to all skill levels
• Ruby Source Code Examples — Demonstrates practical implementation of concepts, executable for verification, aligns with teaching-by-example philosophy
• Git Repository Structure — Enables community contributions, tracks learning material evolution, provides version history of best practices

• Static markdown documentation instead of interactive tutorials

  • Why: Lower maintenance burden, better offline accessibility, simpler contribution process
  • Consequence: Requires readers to actively run examples themselves rather than interactive feedback

• Separate source code files instead of inline code blocks

  • Why: Executable code can be tested and verified, cleaner presentation
  • Consequence: Documentation must stay in sync with source files, slightly fragmented learning flow

• Broad coverage of tricks over deep specialization

  • Why: Serves diverse learner needs, exposes Ruby's flexibility and expressiveness
  • Consequence: Individual topics lack depth for production-critical implementation guidance

• Does not provide automated linting or code quality checking
• Does not include a testing framework or test examples
• Does not cover Ruby on Rails framework patterns
• Does not address concurrent programming or threading in depth
• Does not provide IDE or editor integration plugins
• Does not include performance benchmarking tools

• Documentation-Code Drift — idiomatic_ruby/, tricks/, best_practices/ markdown files vs tricks/source_code/ Ruby files: Markdown

No hidden traps: repository is pure documentation with no runtime environment, dependencies, configuration files, or environment variables. All examples are static markdown code snippets. Only gotcha is that Ruby version compatibility of techniques is not always specified—some tricks may be outdated for Ruby 3.0+ (e.g., syntax changes, stdlib shifts).

• Symbol-to-Proc (&:method_name) — Idiomatic Ruby shorthand for passing methods as blocks (e.g., array.map(&:upcase)); fundamental pattern appearing in tricks, idioms, and refactoring examples throughout the repo
• Memoization — Performance optimization pattern repeated across tricks/memoization.md and tricks/fast-memoization-fibonacci.md; essential for writing efficient Ruby code and avoiding repeated computation
• Metaprogramming (Eigenclass/Singleton Class) — Advanced Ruby concept mentioned in README as source of confusion; understanding eigenclasses is prerequisite for reading advanced refactoring and trick patterns in this collection
• Block Parameters and Yield — Fundamental to Ruby idiom; tricks/blocks-can-take-blocks.md and tricks/introspecting_block_parameters.md explore advanced block handling patterns
• Hash Options Pattern (options_hash_with_defaults) — Ruby convention for flexible method arguments; documented in idiomatic_ruby/options_hash_with_defaults.md and widely used in tricks, essential for API design
• Implicit Return — Ruby language feature (last expression is returned automatically) that differentiates Ruby from C-style languages; explained in idiomatic_ruby/implicit_return.md and influences refactoring patterns
• String vs Symbol Trade-offs — Core Ruby confusion mentioned in README abstract; understanding when to use symbols vs strings (covered in idiomatic_ruby/array_of_strings_symbols.md) is critical for writing idiomatic Ruby

• airbnb/ruby — Airbnb's Ruby style guide covering code conventions, naming, and idioms—complements best-ruby's examples with prescriptive team standards
• bbatsov/ruby-style-guide — Community-driven Ruby style guide (inspiration for much idiomatic Ruby knowledge); establishes conventions this repo demonstrates through examples
• ruby/ruby — Official Ruby language repository; source for understanding stdlib features and tricks documented here, especially useful for verifying technique accuracy
• rmosolgo/graphql-ruby — Production Ruby library that heavily employs idioms and metaprogramming patterns (eigenclass, symbol_to_proc, option hashes) documented in this collection
• rails/rails — Rails framework is the largest consumer of idiomatic Ruby; this collection documents patterns and tricks baked into Rails internals

To work on one of these in Claude Code or Cursor, paste: Implement the "<title>" PR idea from CLAUDE.md, working through the checklist as the task list.

Create SUMMARY.md index for tricks/ subdirectory with consistent navigation

The repo has tricks/SUMMARY.md and tricks/README.md, but unlike the main SUMMARY.md which lists all sections, the tricks subdirectory lacks a comprehensive indexed guide. With 40+ trick files in tricks/, contributors and readers need better navigation. This PR would create a well-organized table of contents (similar to main SUMMARY.md structure) that categorizes tricks by topic (collections, metaprogramming, performance, debugging, etc.) and links to each .md file in tricks/source_code/ for runnable examples.

• [ ] Review all 40+ files in tricks/ directory to identify common themes
• [ ] Categorize tricks into logical groups (e.g., Collections, Performance, Metaprogramming, Debugging, Database/Storage)
• [ ] Update tricks/SUMMARY.md with nested structure matching main SUMMARY.md format
• [ ] Ensure all trick files are referenced with proper markdown links
• [ ] Add cross-references from main SUMMARY.md to tricks section for discoverability

Add runnable code examples to idiomatic_ruby/*.md files with syntax highlighting

The idiomatic_ruby/ directory has 11 concept files (e.g., each_vs_map.md, use_symbol_to_proc.md) but likely lacks executable Ruby code blocks. The tricks/ directory shows this repo values runnable examples (source_code/ subdirectory). This PR would add Before/After code examples to each idiomatic_ruby/*.md file with proper Ruby syntax highlighting, making patterns immediately applicable for contributors learning these concepts.

• [ ] Audit each file in idiomatic_ruby/ to identify missing code examples
• [ ] Add Before/After code blocks to: each_vs_map.md, collect_vs_select.md, use_symbol_to_proc.md, conditional_assignment.md, multiple_assignment.md
• [ ] Ensure code blocks use triple-backticks with 'ruby' language identifier for syntax highlighting
• [ ] Create idiomatic_ruby/source_code/ directory (mirroring tricks/source_code/) with executable .rb files for each concept
• [ ] Add performance/readability notes explaining why the 'idiomatic' version is preferred

Create best_practices/source_code/ with executable examples for each best practice

The best_practices/ directory has only one file (using_exception_e.md) but the broader best_practices.md index likely covers more concepts. Similar to tricks/source_code/, this PR would establish a pattern where best_practices/ has accompanying runnable examples. This makes the content immediately practical and testable for contributors, reducing the gap between theory and application.

• [ ] Review best_practices.md to identify all best practices covered
• [ ] For each best practice concept, create a corresponding .rb file in best_practices/source_code/
• [ ] Expand best_practices/using_exception_e.md with Before/After code blocks if not already present
• [ ] Create best_practices/source_code/using_exception_e.rb with working example
• [ ] Document any new best practice patterns discovered (e.g., error handling, naming conventions, pattern anti-patterns) as new .md files in best_practices/

• Add Ruby 3.x compatibility notes to tricks/: Review 5-10 trick files (tricks/memoization.md, tricks/fast-memoization-fibonacci.md, tricks/lambda-your-own-syntax.md) and add explicit Ruby version requirements or update examples for 3.0+ syntax. Current files lack version context.
• Expand best_practices/ category with new techniques: best_practices/ has only one file (using_exception_e.md) versus 50+ tricks and 10+ idiomatic examples. Contribute 2-3 additional best practice files (e.g., error handling patterns, logging conventions, dependency injection) with examples and references.
• Create cross-referenced index linking related tricks and idioms: Add a 'Related Techniques' section to trick files that reference idiomatic patterns (e.g., tricks/inject.md mentions refactorings/case_with_hashes.md, tricks/memoization.md links to best_practices patterns). Improves learning flow.

This is a documentation and educational repository for Ruby best practices with minimal security risks. No critical vulnerabilities were identified. The codebase contains no external dependencies listed, no hardcoded secrets detected in filenames or visible structure, and no obvious injection risks based on the file structure (this is purely educational content, not a web application). The primary concerns are minor: potential sensitive files (email.txt and people.yml) that should be reviewed for content. The repository follows good practices by including a CODE_OF_CONDUCT.md and .gitignore. Overall security posture is strong for an educational/documentation repository.

• Low · Potential Sensitive File in Repository — tricks/email.txt. The file 'tricks/email.txt' is present in the repository. While the filename suggests it may contain email data, including actual email addresses or contact information in version control could pose privacy and security risks if the repository is public. Fix: Review the contents of this file. If it contains real email addresses or sensitive contact information, remove it from version control, add it to .gitignore, and store such data in environment variables or secure configuration management systems instead.
• Low · Potential Sensitive Data File in Repository — tricks/people.yml. The file 'tricks/people.yml' is present in the repository. YAML files in version control could inadvertently contain personal information or sensitive configuration data. Fix: Review the contents of this file. If it contains personally identifiable information (PII) or sensitive data, remove it from version control and store such data securely outside the repository using environment variables or secure vaults.
• Low · Text File with Unclear Purpose — tricks/ruby_can_even_explain_it_to_you.txt. The file 'tricks/ruby_can_even_explain_it_to_you.txt' has an unclear purpose and naming. Text files in repositories should have clear purposes to avoid accidental inclusion of sensitive data. Fix: Review this file to ensure it doesn't contain sensitive information. Consider renaming it with a clearer purpose or moving it to documentation if appropriate.

LLM-derived; treat as a starting point, not a security audit.

• Open issues — current backlog
• Recent PRs — what's actively shipping
• Source on GitHub

Generated by RepoPilot. Verdict based on maintenance signals — see the live page for receipts. Re-run on a new commit to refresh.