Use this skill to understand Ruby code and its runtime, from objects, blocks, and exceptions to files, concurrency, and memory management. It also covers RubyGems and Bundler, command-line tools, environment variables, and the standard library.
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Use when working with Ruby — the dynamic, object-oriented language and its runtime (MRI/CRuby). Covers the object model, metaprogramming, core types, blocks/procs/lambdas, control flow and exceptions, I/O and encoding, the concurrency model (Threads, Fibers, Ractors, GVL), garbage collection and ObjectSpace, the RubyGems/Bundler package system, the interpreter CLI and tooling (irb, erb, rake, rdoc/ri), environment variables, and the standard library. Triggers on: "ruby", "Ruby", "MRI", "CRuby", "YARV", "Ripper", "object model", "method lookup", "eigenclass", "singleton class", "metaprogramming", "define_method", "method_missing", "class_eval", "instance_eval", "Refinements", "Binding", "Proc", "lambda", "block", "yield", "rescue", "ensure", "raise", "begin", "end", "Encoding", "String#encode", "Thread", "Fiber", "Ractor", "GVL", "GIL", "Mutex", "ObjectSpace", "GC", "WeakRef", "gem", "Gemfile", "Bundler", "gemspec", "bundle exec", "irb", "erb", "rake", "Rakefile", "rdoc", "ri", "RUBYOPT", "RUBYLIB", "GEM_HOME", "GEM_PATH", "BUNDLE_GEMFILE", "frozen string literal", "RUBY_VERSION", "RUBY_ENGINE".
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Comprehensive reference for the Ruby programming language and its reference implementation (MRI/CRuby) — covering the object model, metaprogramming, core types, control flow, I/O and encoding, concurrency, garbage collection, the RubyGems/Bundler package system, the interpreter CLI and tooling, environment variables, and the standard library.
Source file (.rb)
→ Ripper (parse to AST)
→ YARV compiler (compile AST to bytecode instructions)
→ YARV VM (per-instruction dispatch)
→ runtime services (ObjectSpace, GC, Thread scheduler, load path)
→ I/O, exit
Load the reference that matches your task. When in doubt, load multiple references.
| Keywords | Reference |
|---|---|
| object model, class, module, BasicObject, Object, Kernel, ancestor, method lookup, eigenclass, singleton class, superclass, super, included, prepended, inherited, ancestors, const_get, constants, autoload, refine, using, Module vs Class, instance variable, class variable, @@, constant resolution, toplevel, ::, ObjectSpace.each_object, method_missing | references/object-model.md |
| metaprogramming, define_method, class_eval, instance_eval, module_eval, eval, Binding, send, send, public_send, respond_to?, method, method_missing, method_added, Refinements, refine, using, Module.new, Class.new, remove_method, undef_method, alias_method, attr_accessor, attr_reader, attr_writer, define_singleton_method, const_set, trace_point, TracePoint, set_trace_func, caller, caller_locations | references/metaprogramming.md |
| String, Symbol, Integer, Float, Numeric, Rational, Complex, BigDecimal, Array, Hash, Range, Regexp, MatchData, Proc, Method, nil, NilClass, true, false, TrueClass, FalseClass, Boolean, truthiness, eql?, equal?, ==, ===, <=>, Comparable, freeze, frozen?, immutability, dup, clone, deep_copy, hash, inspect, to_s, to_str, coerce | references/types.md |
| block, yield, proc, lambda, Proc, Method, method(:foo), to_proc, &block, ampersand, &, proc call, lambda call, return in block, return in lambda, argument strictness, arity, curry, splat, double splat, **, block_given?, &method(:foo), proc vs lambda | references/blocks-procs-lambdas.md |
| if, unless, case, when, while, until, for, loop, break, next, redo, retry, throw, catch, raise, begin, rescue, ensure, else, Exception, StandardError, RuntimeError, custom exception, rescue modifier, rescue chain, $!, $@, $ERROR_INFO, retry, else clause, fail | references/control-flow.md |
| IO, File, StringIO, File::open, File.open, IO.foreach, IO.read, IO.write, Encoding, String#encode, Encoding.default_external, Encoding.default_internal, magic comment, # encoding, # coding, # frozen_string_literal, external encoding, internal encoding, transcoding, binary mode, text mode, STDIN, STDOUT, STDERR, ARGF, ARGV, open, File.read, File.write, flock, IO.select, pipe, IO.pipe, io/nonblock | references/io-encoding.md |
| Thread, Fiber, Ractor, GVL, GIL, Mutex, ConditionVariable, Queue, SizedQueue, Thread::SizedQueue, Thread::Mutex, Thread::Queue, Thread.group, Thread.list, Thread.current, Thread.main, Thread.pass, Fiber.new, Fiber.resume, Fiber.yield, Fiber.schedule, scheduler, non-blocking, concurrent-ruby, async, Async, actor, Ractor.new, Ractor.receive, Ractor.send, Ractor.yield, Thread.pool, Thread.abort_on_exception, thread variable, Thread.current[:name], GVL release | references/concurrency.md |
| ObjectSpace, ObjectSpace.each_object, ObjectSpace.define_finalizer, ObjectSpace._id2ref, GC, GC.start, GC.stat, GC.disable, GC.enable, GC.stress, generational GC, RGENGC, write barrier, weak reference, WeakRef, WeakMap, ObjectSpace::WeakMap, finalizer, _id2ref, VALUE, immediate value, tagged pointer, RVALUE, RSTRING, memory layout, object shape, shape pool, frozen heap, malloc/free | references/gc-memory.md |
| RubyGems, gem, gem install, gem list, gem uninstall, gem update, gem env, gem which, gemspec, Gem::Specification, Gemfile, Gemfile.lock, Bundler, bundle, bundle install, bundle update, bundle exec, bundle config, bundle add, bundle outdated, bundle lock, bundle check, bundle clean, bundle open, bundle binstubs, groups, :development, :test, :production, source, rubygems.org, git source, path source, BUNDLE_GEMFILE, Gemfile.lock, vendor/cache, Gem::Version, Gem::Requirement | references/gems-bundler.md |
| ruby, ruby interpreter, ruby flag, -e, -I, -r, -n, -p, -a, -F, -l, -0, -K, -E, -w, -W, -d, --enable-gems, --disable-gems, --enable-frozen-string-literal, --disable-frozen-string-literal, irb, .irbrc, binding.irb, erb, ERB, Rake, Rakefile, rake task, rake file task, rake namespace, rake multitask, rake rule, rdoc, ri, RDoc, RDoc::Markup, ripper, ruby-prof, stackprof, memory_profiler, debug, debug.rb, byebug, rdbg, rbs, typeprof, rubocop, standard, ruby version manager, rvm, rbenv, chruby, asdf | references/cli.md |
| environment variable, RUBYOPT, RUBYLIB, RUBY_ENGINE, RUBY_VERSION, RUBY_PLATFORM, RUBY_PATCHLEVEL, RUBY_RELEASE_DATE, RUBY_DESCRIPTION, GEM_HOME, GEM_PATH, GEM_ROOT, GEM_RC, BUNDLE_GEMFILE, BUNDLE_PATH, BUNDLE_FROZEN, BUNDLE_JOBS, BUNDLE_WITHOUT, BUNDLE_BIN, BUNDLE_IGNORE_CONFIG, RUBY_CONFIGURE_OPTS, BUNDLER_VERSION, BUNDLE_CACHE_PATH, PATH modifications, rubyopt parsing, frozen-string-literal default | references/environment.md |
| standard library, stdlib, set, monitor, singleton, forwardable, delegate, observer, logger, optparse, fileutils, pathname, tempfile, tmpdir, json, yaml, psych, csv, erb, digest, securerandom, time, date, matrix, tsort, pp, prettyprint, benchmark, debug_inspector, objspace, io/console, io/nonblock, socket, openssl, net/http, net/smtp, net/pop, net/imap, uri, cgi | references/stdlib.md |
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Use this reference to manage software with Homebrew on macOS or Linux, understand formulas and casks, maintain Brewfiles and services, troubleshoot installations, or work on formula and cask development tasks.
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Use this reference to build and maintain terminal user interfaces in Go with Bubble Tea. It explains the Model/Update/View cycle, commands and messages, input, rendering, program lifecycle, tests, component composition, and patterns for larger applications.
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Use this reference for JavaScript and TypeScript development with Bun. It explains CLI commands, dependency and lockfile management, testing, bundling code, runtime APIs for files and servers, the Bun shell, configuration, and environment variables.
中文简介正在准备中。当前显示英语简介。
Use this reference to manage Git work with the GitButler CLI (`but`), including virtual and stacked branches, assigning changes, editing commits, resolving conflicts, and creating pull requests. It also covers the workspace, operation history, interactive TUI, configuration, and AI agent setup.
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Build and maintain carapace shell completions for command-line tools. The reference covers YAML specs, custom completion actions, shell setup, DSL-aware parsing, MCP use, and documentation for suggested values.
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Use this reference to work with Cargo, Rust’s package manager and build tool. It explains project manifests, dependencies, features, workspaces, build profiles, configuration, registries, publishing, and commands for building, testing, and inspecting projects.
中文简介正在准备中。当前显示英语简介。