Questions tagged [ruby]

Ruby is a multi-platform open-source, dynamic object-oriented interpreted language. The [ruby] tag is for questions related to the Ruby language, including its syntax and its libraries. Ruby on Rails questions should be tagged with [ruby-on-rails].

The ruby tag is for questions related to the Ruby language, including its syntax and its libraries. Questions specifically about the Ruby on Rails framework should be tagged with ruby-on-rails in addition to ruby. Do not use this to tag ruby used in the Japanese language.

Ruby is an open-source dynamic object-oriented interpreted language that combines concepts from Perl, Smalltalk, and Lisp. It supports multiple programming paradigms including functional, object-oriented, and imperative. It also has a dynamic type system and automatic memory management; it is, therefore, similar in varying respects to Smalltalk, Python, Perl, Lisp, Dylan, and CLU. Ruby's primary purpose is to "help every programmer in the world to be productive, and to enjoy programming, and to be happy." Ruby focuses on simplicity and productivity.

Ruby was initially conceived on February 24, 1993, by Yukihiro Matsumoto ('Matz') and version 1.0 was released in 1996. Ruby's mindshare spiked around 2005 due to Ruby on Rails, an MVC (Model, View, Controller) framework for building web applications and usage continues to grow as of 2016 with Ruby continuing to find acceptance in the commercial marketplace. The current stable version is 3.2.0 (2022-12-25).

Documentation, Announcements, Issue Tracker

Ruby Programming Language
Official Issue tracker
Ruby Doc, Ruby Core API Documentation
Ruby Doc, Ruby Standard Library API Documentation
Security announcements for Ruby, Rails, RubyGems, Bundler, and more

Unofficial Reference

Implementations, Installers

Ruby version managers. chruby, rbenv, rvm, pik (Windows)
Ruby, the official implementation also known as Matz' Ruby Implementation (MRI), YARV-Ruby. Official Site, GitHub
JRuby, an implementation of Ruby on top of Java with access to the JVM
Rubinius, an implementation of Ruby supporting native OS threads and a core library written almost entirely in Ruby
Ruby Enterprise Edition (not maintained anymore), a branch of MRI Ruby made for efficiency
MacRuby, an implementation of Ruby on Apples Objective-C and Cocoa frameworks
MagLev an implementation on top of VMWare's GemStone virtual machine
IronRuby is an implementation of Ruby on top of Microsoft's .NET CLR/DLR platform
Cardinal is an implementation of Ruby for the Parrot Virtual Machine
Topaz is an implementation of Ruby written in Python, on top of RPython
RubyMotion is an implementation of Ruby to develop native iOS and OS X applications

Gems (Library)

Ruby Gems - The Standard Library
Ruby Toolbox - Ruby Gems categorization, ranking, and statistics
Awesome Ruby - A categorized collection of awesome Ruby libraries, tools, frameworks, and software. The essential Ruby to build modern Apps and Web Apps
Bundler - Manage your application's gem dependencies
DevKit - A windows toolkit that makes it easy to build and use native C/C++ extensions

Tools

repl.it - Online REPL
RSpec - A testing tool for Ruby
Minitest - A testing tool for Ruby
Rubular - A Ruby regular expression tool
Pry - REPL and debugger for Ruby
Rubocop - A Ruby linter and code formatter

Online Courses

Ruby for Beginners
Ruby Tutorial
Codeacademy - Learn the fundamentals of Ruby and dynamic programming
RubyMonk - Free, interactive tutorials
Learn Ruby The Hard Way - Free
Why's (Poignant) Guide to Ruby - Free
Pluralsight - Video Lessons, Coding Challenges, and Screencasts
Ruby Tapas - Video Lessons and Screencasts - A wide variety of intermediate to advanced Ruby concepts and techniques, as well as core object-oriented design principles
The Pragmatic Studio - Project Driven Online Courses
Web Application Architectures - Learn how to build and deploy modern web application architectures – applications that run over the Internet, in the "cloud," using a browser as the user interface. We're going to learn about web apps through the Ruby on Rails framework. Rails is a framework for creating web applications that are built on top of the Ruby programming language.
Flatiron School's Intro to Ruby - Free, introductory course with instructors available for help
The Odin Project - Free online curriculum for beginners.

Books

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228397 questions

votes

1 answer

RSpec allow/expect vs just expect/and_return

In RSpec, specifically version >= 3, is there any difference between: Using allow to set up message expectations with parameters that return test doubles, and then using expect to make an assertion on the returned test doubles Just using expect to…

ruby testing rspec mocking rspec3

asked Jan 18 '15 at 03:41

Paul Fioravanti

16,423
7
71
122

votes

6 answers

How to elegantly symbolize_keys for a 'nested' hash

Consider the following code: hash1 = {"one" => 1, "two" => 2, "three" => 3} hash2 = hash1.reduce({}){ |h, (k,v)| h.merge(k => hash1) } hash3 = hash2.reduce({}){ |h, (k,v)| h.merge(k => hash2) } hash4 = hash3.reduce({}){ |h, (k,v)| h.merge(k…

ruby-on-rails ruby hash dry

asked Jul 24 '14 at 07:33

SHS

7,651
3
18
28

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2 answers

How do I write a complex multi-line if condition in Ruby?

How do I write this multi-line, complex condition if statement in Ruby? if ( (aa != nil && self.prop1 == aa.decrypt) || (bb != nil && self.prop2 == bb.decrypt) ) && (self.id.nil? || self.id != id) return true end I'm getting…

ruby if-statement conditional-statements

asked Jan 28 '14 at 21:42

Chloe

25,162
40
190
357

votes

6 answers

Calling method in parent class from subclass methods in Ruby

I've used super to initialize parent class but I cannot see any way of calling parent class from subclass methods. I know PHP and other languages do have this feature but cannot find a good way to do this in Ruby. What would one do in this…

ruby

asked Aug 26 '13 at 16:37

Passionate Engineer

10,034
26
96
168

votes

8 answers

"rmagick" gem installation issue

I am having issue while trying to install "rmagick" gem on centos. Following is the output I am having. Can anyone please help me identifying what package I am missing? I have installed all mentioned another stack-overflow thread: RMagick install…

ruby rubygems

asked May 27 '13 at 13:39

Rana

5,912
12
58
91

votes

3 answers

How to organize minitest/unit tests?

After using RSpec for several projects, I'm giving minitest/unit a go. I'm liking it so far, but I miss using describe/context blocks to group my tests/specs in a logical way. I know minitest/spec provides this functionality, but I like that…

ruby-on-rails ruby minitest

asked Jan 10 '13 at 17:33

Doug Johnston

votes

9 answers

Convert CSV file into array of hashes

I have a csv file, some hockey stats, for example: 09.09.2008,1,HC Vitkovice Steel,BK Mlada Boleslav,1:0 (PP) 09.09.2008,1,HC Lasselsberger Plzen,RI OKNA ZLIN,6:2 09.09.2008,1,HC Litvinov,HC Sparta Praha,3:5 I want to save them in an array of…

ruby csv multidimensional-array

asked Jan 07 '13 at 16:17

Mythago

votes

5 answers

Ruby deleting directories

I'm trying to delete a non-empty directory in Ruby and no matter which way I go about it it refuses to work. I have tried using FileUtils, system calls, recursively going into the given directory and deleting everything, but always seem to end up…

ruby directory

asked Sep 09 '12 at 00:36

Ced

1,117
1
8
16

votes

4 answers

How do you use global variables or constant values in Ruby?

I have a program that looks like: $offset = Point.new(100, 200); def draw(point) pointNew = $offset + point; drawAbsolute(point) end draw(Point.new(3, 4)); the use of $offset seems a bit weird. In C, if I define something outside of any…

ruby global-variables

asked Jun 25 '09 at 06:03

nonopolarity

146,324
131
460
740

votes

10 answers

Rails: An elegant way to display a message when there are no elements in database

I realized that I'm writing a lot of code similar to this one: <% unless @messages.blank? %> <% @messages.each do |message| %> <%# code or partial to display the message %> <% end %> <% else %> You have no messages. <% end %> Is there…

ruby-on-rails ruby loops iterator

asked Jun 22 '09 at 15:33

Jakub Troszok

99,267
11
41
53

votes

9 answers

Ruby: merge nested hash

I would like to merge a nested hash. a = {:book=> [{:title=>"Hamlet", :author=>"William Shakespeare" }]} b = {:book=> [{:title=>"Pride and Prejudice", :author=>"Jane Austen" }]} I would like the merge to…

ruby hash merge nested

asked Feb 21 '12 at 16:48

user1223862

1,193
2
9
10

votes

10 answers

Rails 3. How to add a helper that ActiveAdmin will use?

I'm creating a helper to be used by Formtastic but I get the undefined local variable or method error. I don't know where to put it so it can work. I already tried in the application_helper.rb and in app/helpers/active_admin/view_helpers.rb

ruby-on-rails ruby helper activeadmin

asked Dec 29 '11 at 20:35

leonel

10,106
21
85
129

votes

7 answers

How to check if a variable is a number or a string?

How to check if a variable is a number or a string in Ruby?

ruby

asked Dec 23 '11 at 12:56

Leem.fin

40,781
83
202
354

votes

35 answers

Why learn Perl, Python, Ruby if the company is using C++, C# or Java as the application language?

I wonder why would a C++, C#, Java developer want to learn a dynamic language? Assuming the company won't switch its main development language from C++/C#/Java to a dynamic one what use is there for a dynamic language? What helper tasks can be done…

c# java python ruby perl

asked Sep 17 '08 at 15:16

szabgab

6,202
11
50
64

votes

6 answers

When do Ruby instance variables get set?

class Hello @hello = "hello" def display puts @hello end end h = Hello.new h.display I created the class above. It doesn't print anything out. I thought the instance variable @hello was set during the class declaration. But when I…

ruby syntax instance-variables

asked May 05 '09 at 20:16

pez_dispenser

4,394
7
37
47

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Questions tagged [ruby]

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