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

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10 answers

Rails, How to render a view/partial in a model

In my model I have: after_create :push_create I push_create I need to render a view. I'm trying to do that like so: def push_event(event_type) X["XXXXX-#{Rails.env}"].trigger(event_type, { :content => render( :partial…

ruby-on-rails ruby ruby-on-rails-3

asked Jun 11 '11 at 22:42

AnApprentice

108,152
195
629
1,012

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4 answers

Create a ruby method that accepts a hash of parameters

I don't know how to create a ruby method that accepts a hash of parameters. I mean, in Rails I'd like to use a method like this: login_success :msg => "Success!", :gotourl => user_url What is the prototype of a method that accepts this kind of…

ruby

asked Feb 24 '09 at 20:23

collimarco

34,231
36
108
142

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11 answers

How to group by count in array without using loop

arr = [1,2,1,3,5,2,4] How can I count the array by group value with sorting? I need the following output: x[1] = 2 x[2] = 2 x[3] = 1 x[4] = 1 x[5] = 1

ruby

asked Mar 29 '11 at 09:55

Mr. Black

11,692
13
60
85

votes

6 answers

Super keyword in Ruby

What is the super for in this code? def initialize options = {}, &block @filter = options.delete(:filter) || 1 super end As far as I know it's like calling the function recursively, right?

ruby

asked Jan 08 '11 at 03:48

mabounassif

2,311
6
29
46

votes

8 answers

How do I use RVM and create globally available gems?

I'm running Mac OSX 10.6.4 and have installed RVM. Its been great so far, I really love the way it lets me manage having multiple versions of rails and ruby on the same machine without headaches! However, I don't want to have to install certain…

ruby-on-rails ruby macos rubygems

asked Oct 24 '10 at 04:19

GiH

14,006
13
43
56

votes

5 answers

What is the difference between "if" statements with "then" at the end?

What's the difference between these two Ruby if statements when we put a then at the end of the if statement? if(val == "hi") then something.meth("hello") else something.meth("right") end and if(val == "hi") something.meth("hello") else …

ruby

asked Jun 21 '10 at 09:55

Mo.

40,243
37
86
131

votes

15 answers

Count the number of lines in a file without reading entire file into memory?

I'm processing huge data files (millions of lines each). Before I start processing I'd like to get a count of the number of lines in the file, so I can then indicate how far along the processing is. Because of the size of the files, it would not…

ruby

asked Apr 16 '10 at 04:02

smnirven

1,518
1
13
15

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5 answers

What Ruby and Rails Developers Ought To Know?

What should someone know as an Entry Level, Mid-level, and Senior Developer working with Rails? Across the board: theoretical knowledge, development tools, gems and more. What issues usually are at the interview?

ruby-on-rails ruby

asked Apr 02 '10 at 22:21

akrisanov

3,212
6
33
56

votes

5 answers

Set the display precision of a float in Ruby

Is it possible to set the display precision of a float in Ruby? Something like: z = 1/3 z.to_s #=> 0.33333333333333 z.to_s(3) #=> 0.333 z.to_s(5) #=> 0.33333 Or do I have to override the to_s method of Float?

ruby floating-point precision

asked Dec 19 '09 at 19:49

salt.racer

21,903
14
44
51

votes

5 answers

What does the "$" character mean in Ruby?

Been playing with Ruby on Rails for awhile and decided to take a look through the actual source. Grabbed the repo from GitHub and started looking around. Came across some code that I am not sure what it does or what it references. I saw this code…

ruby-on-rails ruby global-variables dollar-sign load-path

asked Dec 13 '09 at 15:53

Scott Radcliff

1,501
1
9
13

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11 answers

gem install fails with openssl failure

I tried to install cocoapods (http://cocoapods.org/) on my OSX Mountain Lion. moshe-mbp:~ moshem$ gem install cocoapods ERROR: Could not find a valid gem 'cocoapods' (>= 0), here is why: Unable to download data from https://rubygems.org/ -…

ruby macos rubygems openssl cocoapods

asked Mar 08 '13 at 23:55

Moshe Marciano

2,349
4
33
44

votes

7 answers

Ruby XML to JSON Converter?

Is there a library to convert XML to JSON in Ruby?

xml ruby json converters

asked Oct 07 '09 at 08:42

Lance

75,200
93
289
503

votes

4 answers

What does to_proc method mean in Ruby?

I am learning rails and following this thread. I am stuck with the to_proc method. I consider symbols only as alternatives to strings (they are like strings but cheaper in terms of memory). If there is anything else I am missing for symbols, then…

ruby syntax block symbols proc

asked Feb 14 '13 at 17:58

swapnesh

26,318
22
94
126

votes

8 answers

How can I password-protect my /sidekiq route (i.e. require authentication for the Sidekiq::Web tool)?

I am using sidekiq in my rails application. By Default, Sidekiq can be accessed by anybody by appending "/sidekiq" after the url. I want to password protect / authenticate only the sidekiq part. How can i do that?

ruby ruby-on-rails-3 redis rescue sidekiq

asked Sep 04 '12 at 14:16

sagar junnarkar

1,240
2
10
18

votes

4 answers

How to save a base64 string as an image using ruby

I'm integrating my Ruby on Rails app with a usps shipping system. Once you make a postage request, you pay for that postage and it's nonrefundable. Postage requests will return you an xml response including a base64 string, which is the shipping…

ruby-on-rails ruby image file-io base64

asked Jul 21 '09 at 18:02

Ricky

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Questions tagged [ruby]

Documentation, Announcements, Issue Tracker

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Books

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