File: standard_library.rdoc [Ruby 2.3.4]

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    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

    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

    CGI

    Support for the Common Gateway Interface protocol

    CMath

    Provides Trigonometric and Transcendental functions for complex numbers

    ConditionVariable

    Augments the Mutex class, provided by thread.rb

    CSV

    Provides an interface to read and write CSV files and data

    DEBUGGER__

    Debugging functionality for Ruby

    Delegator

    Provides three abilities to delegate method calls to an object

    DRb

    Distributed object system for Ruby

    E2MM

    Module for defining custom exceptions with specific messages

    English.rb

    Require ‘English.rb’ to reference global variables with less cryptic names

    ERB

    An easy to use but powerful templating system for Ruby

    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)

    Logger

    Provides a simple logging utility for outputing messages

    mathn.rb

    Deprecated library that extends math operations

    MakeMakefile

    Module used to generate a Makefile for C extensions

    Matrix

    Represents a mathematical matrix.

    Monitor

    Provides an object or module to use safely by more than one thread

    Mutex_m

    Mixin to extend objects to be handled like a Mutex

    Net::FTP

    Support for the File Transfer Protocol

    Net::HTTP

    HTTP client api for Ruby

    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

    Net::Telnet

    Telnet client library for Ruby

    Observable

    Provides a mechanism for publich/subscribe pattern in Ruby

    OpenURI

    An easy-to-use wrapper for Net::HTTP, Net::HTTPS and Net::FTP

    Open3

    Provides access to stdin, stdout and stderr when running other programs

    OptionParser

    Ruby-oriented class for command-line option analysis

    OpenStruct

    Class to build custom data structures, similar to a Hash

    PP

    Provides a PrettyPrinter for Ruby objects

    PrettyPrinter

    Implements a pretty printing algorithm for readable structure

    Prime

    Prime numbers and factorization library

    profile.rb

    Runs the Ruby Profiler__

    Profiler__

    Provides a way to profile your Ruby application

    PStore

    Implements a file based persistence mechanism based on a Hash

    Queue

    Synchronized communication between threads, provided by thread.rb

    Racc

    A LALR(1) parser generator written in Ruby.

    Rake

    Ruby build program with capabilities similar to make

    RbConfig

    Information of your configure and build of Ruby

    RDoc

    Produces HTML and command-line documentation for Ruby

    resolv-replace.rb

    Replace Socket DNS with Resolv

    Resolv

    Thread-aware DNS resolver library in Ruby

    REXML

    An XML toolkit for Ruby

    Rinda

    The Linda distributed computing paradigm in Ruby

    RSS

    Family of libraries that support various formats of XML “feeds”

    Gem

    Package management framework for Ruby

    Scanf

    A Ruby implementation of the C function scanf(3)

    SecureRandom

    Interface for secure random number generator

    Set

    Provides a class to deal with collections of unordered, unique values

    Shell

    An idiomatic Ruby interface for common UNIX shell commands

    Shellwords

    Manipulates strings with word parsing rules of UNIX Bourne shell

    Singleton

    Implementation of the Singleton pattern for Ruby

    Synchronizer

    A module that provides a two-phase lock with a counter

    Tempfile

    A utility class for managing temporary files

    ThreadsWait

    Watches for termination of multiple threads

    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

    Tracer

    Outputs a source level execution trace of a Ruby program

    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

    WeakRef

    Allows a referenced object to be garbage-collected

    WEBrick

    An HTTP server toolkit for Ruby

    XMLRPC

    Remote Procedure Call over HTTP support for Ruby

    YAML

    Ruby client library for the Psych YAML implementation

    Extensions

    BigDecimal

    Provides arbitrary-precision floating point decimal arithmetic

    Coverage

    Provides coverage measurement for Ruby

    Date

    A subclass of Object includes Comparable module for handling dates

    DateTime

    Subclass of Date to handling dates, hours, minutes, seconds, offsets

    DBM

    Provides a wrapper for the UNIX-style Database Manager Library

    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

    GDBM

    Ruby extension for the GNU dbm (gdbm) library

    IO

    Extensions for Ruby IO class, including wait and ::console

    JSON

    Implements Javascript Object Notation for Ruby

    NKF

    Ruby extension for Network Kanji Filter

    objspace

    Extends ObjectSpace module to add methods for internal statistics

    OpenSSL

    Provides SSL, TSL 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

    PTY

    Creates and manages pseudo terminals

    Readline

    Provides an interface for GNU Readline and Edit Line (libedit)

    Ripper

    Provides an interface for parsing Ruby programs into S-expressions

    SBDM

    Provides a simple file-based key-value store with String keys and values

    Socket

    Access underlying OS socket implementations

    StringIO

    Pseudo I/O on String objects

    StringScanner

    Provides lexical scanning operations on a String

    Syslog

    Ruby interface for the POSIX system logging facility

    Thread

    Provides support classes for threaded programs

    Tk

    Provides a framework for building a Graphical User Interface (GUI)

    WIN32OLE

    Provides an interface for OLE Automation in Ruby

    Zlib

    Ruby interface for the zlib compression/decompression library