Ruby Standard Library¶ ↑

The Ruby Standard Library is a large collection of classes and modules you can require in your code to gain additional features.

Below is an overview of the libraries and extensions, followed by a brief description of each.

Libraries¶ ↑

• MakeMakefile: A module used to generate a Makefile for C extensions

• RbConfig: Information about your Ruby configuration and build

• Gem: A package management framework for Ruby

Extensions¶ ↑

• Coverage: Provides coverage measurement for Ruby

• Monitor: Provides a reentrant mutex

• objspace: Extends the ObjectSpace module to add methods for internal statistics

• PTY: Creates and manages pseudo-terminals

• Ripper: Provides an interface for parsing Ruby programs into S-expressions

• Socket: Accesses underlying OS socket implementations

Default gems¶ ↑

• Default gems are shipped with Ruby releases and also available as rubygems.

• Default gems are not uninstallable from the Ruby installation.

• Default gems can be updated using rubygems.

  • e.g. gem update json

• Default gems can be used with bundler environments like unbundled_env.

• Default gems can be used at any version in a Gemfile.

  • e.g. gem "json", ">= 2.6"

Libraries¶ ↑

• Bundler (GitHub): Manage your Ruby application’s gem dependencies

• CGI (GitHub): Support for the Common Gateway Interface protocol

• Delegator (GitHub): Provides three abilities to delegate method calls to an object

• DidYouMean (GitHub): “Did you mean?” experience in Ruby

• English (GitHub): Provides references to special global variables with less cryptic names

• ERB (GitHub): An easy-to-use but powerful templating system for Ruby

• ErrorHighlight (GitHub): Highlight error locations in your code

• FileUtils (GitHub): Several file utility methods for copying, moving, removing, etc.

• Find (GitHub): This module supports top-down traversal of a set of file paths

• Forwardable (GitHub): Provides delegation of specified methods to a designated object

• IPAddr (GitHub): Provides methods to manipulate IPv4 and IPv6 IP addresses

• OptionParser (GitHub): Ruby-oriented class for command-line option analysis

• Net::HTTP (GitHub): HTTP client API for Ruby

• Open3 (GitHub): Provides access to stdin, stdout, and stderr when running other programs

• OpenURI (GitHub): An easy-to-use wrapper for URI::HTTP, URI::HTTPS, and URI::FTP

• PP (GitHub): Provides a PrettyPrinter for Ruby objects

• PrettyPrint (GitHub): Implements a pretty printing algorithm for readable structure

• Prism (GitHub): A portable, error-tolerant Ruby parser

• Resolv (GitHub): Thread-aware DNS resolver library in Ruby

• SecureRandom (GitHub): Interface for a secure random number generator

• Set (GitHub): Provides a class to deal with collections of unordered, unique values

• Shellwords (GitHub): Manipulates strings with the word parsing rules of the UNIX Bourne shell

• Singleton (GitHub): Implementation of the Singleton pattern for Ruby

• Tempfile (GitHub): A utility class for managing temporary files

• Time (GitHub): Extends the Time class with methods for parsing and conversion

• Timeout (GitHub): Auto-terminate potentially long-running operations in Ruby

• TSort (GitHub): Topological sorting using Tarjan’s algorithm

• UN (GitHub): Utilities to replace common UNIX commands

• URI (GitHub): A Ruby module providing support for Uniform Resource Identifiers

• YAML (GitHub): The Ruby client library for the Psych YAML implementation

• WeakRef (GitHub): Allows a referenced object to be garbage-collected

Extensions¶ ↑

• Date (GitHub): Represents dates, with a subclass for dates with time and timezones

• Digest (GitHub): Provides a framework for message digest libraries

• Etc (GitHub): Provides access to information typically stored in the UNIX /etc directory

• Fcntl (GitHub): Loads constants defined in the OS fcntl.h C header file

• IO.console (GitHub): Extensions for the IO class, including IO.console, IO.winsize, etc.

• JSON (GitHub): Implements JavaScript Object Notation for Ruby

• OpenSSL (GitHub): Provides SSL, TLS, and general-purpose cryptography for Ruby

• Pathname (GitHub): Representation of the name of a file or directory on the filesystem

• Psych (GitHub): A YAML parser and emitter for Ruby

• StringIO (GitHub): Pseudo-I/O on String objects

• StringScanner (GitHub): Provides lexical scanning operations on a String

• TmpDir (GitHub): Extends the Dir class to manage the OS temporary file path

• Zlib (GitHub): Ruby interface for the zlib compression/decompression library

Bundled gems¶ ↑

• Bundled gems are shipped with Ruby releases and also available as rubygems.

  • They are only bundled with Ruby releases.

  • They can be uninstalled from the Ruby installation.

  • They need to be declared in a Gemfile when used with bundler.

Libraries¶ ↑

• minitest: A test library supporting TDD, BDD, mocking, and benchmarking

• power_assert: Power Assert for Ruby

• rake: Ruby build program with capabilities similar to make

• test-unit: A compatibility layer for MiniTest

• rexml: An XML toolkit for Ruby

• rss: A family of libraries supporting various XML-based “feeds”

• net-ftp: Support for the File Transfer Protocol

• net-imap: Ruby client API for the Internet Message Access Protocol

• net-pop: Ruby client library for POP3

• net-smtp: Simple Mail Transfer Protocol client library for Ruby

• matrix: Represents a mathematical matrix

• prime: Prime numbers and factorization library

• rbs: RBS is a language to describe the structure of Ruby programs

• typeprof: A type analysis tool for Ruby code based on abstract interpretation

• debug: Debugging functionality for Ruby

• racc: A LALR(1) parser generator written in Ruby

• mutex_m: Mixin to extend objects to be handled like a Mutex

• getoptlong: Parse command line options similar to the GNU C getopt_long()

• base64: Support for encoding and decoding binary data using a Base64 representation

• bigdecimal: Provides arbitrary-precision floating point decimal arithmetic

• observer: Provides a mechanism for the publish/subscribe pattern in Ruby

• abbrev: Calculates a set of unique abbreviations for a given set of strings

• resolv-replace: Replace Socket DNS with Resolv

• rinda: The Linda distributed computing paradigm in Ruby

• drb: Distributed object system for Ruby

• nkf: Ruby extension for the Network Kanji Filter

• syslog: Ruby interface for the POSIX system logging facility

• csv: Provides an interface to read and write CSV files and data

• ostruct: A class to build custom data structures, similar to a Hash

• benchmark: Provides methods to measure and report the time used to execute code

• logger: Provides a simple logging utility for outputting messages

• pstore: Implements a file-based persistence mechanism based on a Hash

• win32ole: Provides an interface for OLE Automation in Ruby

• reline: GNU Readline and Editline in a pure Ruby implementation

• readline: Wrapper for the Readline extension and Reline

• fiddle: A libffi wrapper for Ruby

Tools¶ ↑

• IRB (GitHub): Interactive Ruby command-line tool for REPL (Read Eval Print Loop)

• RDoc (GitHub): Documentation generator for Ruby