Ruby Standard Library¶ ↑

The Ruby Standard Library is a vast collection of classes and modules that you can require in your code for additional features.

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

Libraries¶ ↑

MakeMakefile: Module used to generate a Makefile for C extensions
RbConfig: Information of your configure and build of Ruby
Gem: Package management framework for Ruby

Extensions¶ ↑

Coverage: Provides coverage measurement for Ruby
Monitor: Provides an object or module to use safely by more than one thread
objspace: Extends 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: Access underlying OS socket implementations

Default gems¶ ↑

default gems are shipped with Ruby releases and also available as rubygems.
default gems are not uninstallable from Ruby installation.
default gems can be updated used by rubygems.
```
* e.g. `gem update json`
```
default gems can be used with bundler environment like ‘unbundled_env`.
default gems can be used any version on Gemfile.
```
* e.g. `gem "json", ">= 2.6"`
```

Libraries¶ ↑

Abbrev: Calculates a set of unique abbreviations for a given set of strings
Base64: Support for encoding and decoding binary data using a Base64 representation
Benchmark: Provides methods to measure and report the time used to execute code
Bundler: Manage your Ruby application’s gem dependencies
CGI: Support for the Common Gateway Interface protocol
CSV: Provides an interface to read and write CSV files and data
Delegator: Provides three abilities to delegate method calls to an object
DidYouMean: “Did you mean?” experience in Ruby
DRb: Distributed object system for Ruby
English: Provides references to special global variables with less cryptic names
ERB: An easy to use but powerful templating system for Ruby
ErrorHighlight: Highlight error location in your code
FileUtils: Several file utility methods for copying, moving, removing, etc
Find: This module supports top-down traversal of a set of file paths
Forwardable: Provides delegation of specified methods to a designated object
GetoptLong: Parse command line options similar to the GNU C getopt_long()
IPAddr: Provides methods to manipulate IPv4 and IPv6 IP addresses
IRB: Interactive Ruby command-line tool for REPL (Read Eval Print Loop)
OptionParser: Ruby-oriented class for command-line option analysis
Logger: Provides a simple logging utility for outputting messages
Mutex_m: Mixin to extend objects to be handled like a Mutex
Net::HTTP: HTTP client api for Ruby
Observable: Provides a mechanism for publish/subscribe pattern in Ruby
Open3: Provides access to stdin, stdout and stderr when running other programs
OpenStruct: Class to build custom data structures, similar to a Hash
OpenURI: An easy-to-use wrapper for Net::HTTP, Net::HTTPS and Net::FTP
PP: Provides a PrettyPrinter for Ruby objects
PrettyPrinter: Implements a pretty printing algorithm for readable structure
Prism: A portable, error-tolerant Ruby parser
PStore: Implements a file based persistence mechanism based on a Hash
Readline: Wrapper for Readline extencion and Reline
Reline: GNU Readline and Editline by pure Ruby implementation.
Resolv: Thread-aware DNS resolver library in Ruby
resolv-replace.rb: Replace Socket DNS with Resolv
RDoc: Produces HTML and command-line documentation for Ruby
Rinda: The Linda distributed computing paradigm in Ruby
SecureRandom: Interface for secure random number generator
Set: Provides a class to deal with collections of unordered, unique values
Shellwords: Manipulates strings with word parsing rules of UNIX Bourne shell
Singleton: Implementation of the Singleton pattern for Ruby
Tempfile: A utility class for managing temporary files
Time: Extends the Time class with methods for parsing and conversion
Timeout: Auto-terminate potentially long-running operations in Ruby
tmpdir.rb: Extends the Dir class to manage the OS temporary file path
TSort: Topological sorting using Tarjan’s algorithm
un.rb: Utilities to replace common UNIX commands
URI: A Ruby module providing support for Uniform Resource Identifiers
YAML: Ruby client library for the Psych YAML implementation
WeakRef: Allows a referenced object to be garbage-collected

Extensions¶ ↑

BigDecimal: Provides arbitrary-precision floating point decimal arithmetic
Date: A subclass of Object includes Comparable module for handling dates
DateTime: Subclass of Date to handling dates, hours, minutes, seconds, offsets
Digest: Provides a framework for message digest libraries
Etc: Provides access to information typically stored in UNIX /etc directory
Fcntl: Loads constants defined in the OS fcntl.h C header file
Fiddle: A libffi wrapper for Ruby
IO: Extensions for Ruby IO class, including wait, nonblock and ::console
JSON: Implements Javascript Object Notation for Ruby
NKF: Ruby extension for Network Kanji Filter
OpenSSL: Provides SSL, TLS and general purpose cryptography for Ruby
Pathname: Representation of the name of a file or directory on the filesystem
Psych: A YAML parser and emitter for Ruby
StringIO: Pseudo I/O on String objects
StringScanner: Provides lexical scanning operations on a String
Syslog: Ruby interface for the POSIX system logging facility
WIN32OLE: Provides an interface for OLE Automation in Ruby
Zlib: Ruby interface for the zlib compression/decompression library

Bundled gems¶ ↑

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

bundled gems are same as normal gems like ‘rails`, `rack`.

* They are only bundled with Ruby releases.
* They can be uninstallable from Ruby installation.
* They are needed to declare in Gemfile when use with bundler.

Libraries¶ ↑

MiniTest: A test suite with TDD, BDD, mocking and benchmarking
PowerAssert: 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: Family of libraries that support various formats of XML “feeds”
Net::FTP: Support for the File Transfer Protocol
Net::IMAP: Ruby client api for Internet Message Access Protocol
Net::POP3: 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
DEBUGGER__: Debugging functionality for Ruby
Racc: A LALR(1) parser generator written in Ruby.