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

6 answers

Rails, Ruby, how to sort an Array?

in my rails app I'm creating an array like so: @messages.each do |message| @list << { :id => message.id, :title => message.title, :time_ago => message.replies.first.created_at } end After making this array I would like to then sort…

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

asked Apr 21 '11 at 03:24

AnApprentice

108,152
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5 answers

How to rename a file in Ruby?

Here's my .rb file: puts "Renaming files..." folder_path = "/home/papuccino1/Desktop/Test" Dir.glob(folder_path + "/*").sort.each do |f| filename = File.basename(f, File.extname(f)) File.rename(f, filename.capitalize +…

ruby file dir

asked Apr 03 '11 at 15:21

delete

votes

2 answers

Why can't a variable name end with `?` while a method name can?

A method name can end with a question mark ? def has_completed? return count > 10 end but a variable name cannot. What is the reason for that? Isn't it convenient to have variable names ending the same way too? Given that we usually can't tell…

ruby

asked Mar 27 '11 at 11:30

nonopolarity

146,324
131
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740

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7 answers

what's different between each and collect method in Ruby

From this code I don't know the difference between the two methods, collect and each. a = ["L","Z","J"].collect{|x| puts x.succ} #=> M AA K print a.class #=> Array b = ["L","Z","J"].each{|x| puts x.succ} #=> M AA K print b.class #=> Array

ruby each collect

asked Mar 18 '11 at 04:06

mko

21,334
49
130
191

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5 answers

How to "soft delete" user with Devise

I currently use Devise for user registration/authentication in a Rails project. When a user wants to cancel their account, the user object is destroyed, which leaves my application in an undesired state. What is the easiest way to implement a "soft…

ruby-on-rails ruby authentication

asked Feb 28 '11 at 10:13

slhck

36,575
28
148
201

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7 answers

Ruby craziness: Class vs Object?

I just started playing with JRuby. This is my first ruby post. I had a hard time understanding classes vs objects in Ruby. It doesnt mean like what classes & objects in other Object oriented laguages. for an example Class.is_a? Object returns…

ruby class object

asked Feb 11 '11 at 09:45

RameshVel

64,778
30
169
213

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3 answers

Changing field separator/delimiter in exported CSV using Ruby CSV

Is it possible to change the default field separator from comma to to some other character, e.g '|' for exporting?

ruby csv

asked Jan 27 '11 at 21:03

Vincent

16,086
18
67
73

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1 answer

Rails: difference between ENV.fetch() and ENV[]

What is the difference between these two syntax: ENV.fetch("MY_VAR") ENV['MY_VAR'] I've seen Rails 5 use both versions of these in difference places and can't figure out what the difference is (apart from the first one being more characters to…

ruby-on-rails ruby ruby-on-rails-5

asked Dec 27 '17 at 02:32

Winker

votes

4 answers

:as in rails routes.rb

In config/routes.rb, I tried both: root :to => 'things#index', :as => 'things' and root :to => 'things#index' When I hit http://localhost:3000/, both approaches work, and nothing seems to be different. What is the :as option used for?

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

asked Jan 14 '11 at 21:38

ryanprayogo

11,587
11
51
66

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5 answers

How do I set a blank value for an f.select form field

I am using the following to allow my users to select their sex in their profile. <%= f.select (:sex, %w{ Male Female }) %> How would I create a blank value that the list would default to if nothing has been passed to the user.sex column? I am…

ruby-on-rails ruby select

asked Dec 14 '10 at 21:40

bgadoci

6,363
17
64
91

votes

2 answers

What does the Ruby method 'to_sym' do?

What does the to_sym method do? What is it used for?

ruby string methods symbols

asked Oct 31 '10 at 11:38

keruilin

16,782
34
108
175

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3 answers

Sinatra vs. Rails

I've worked through some of the Sinatra and Rails samples, but I'm having a hard time figuring out which features belong to which technology. What specifically do I gain by using Sinatra/Rails? Is it just ActionPack/ActionView? Correct me if I'm…

ruby-on-rails ruby sinatra

asked Oct 21 '10 at 16:00

LoveMeSomeCode

3,888
8
34
48

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7 answers

How can I count the number of records that have a unique value in a particular field in ROR?

I have a record set that includes a date field, and want to determine how many unique dates are represented in the record set. Something like: Record.find(:all).date.unique.count but of course, that doesn't seem to work.

ruby-on-rails ruby activerecord

asked Aug 31 '08 at 03:19

Brent

16,259
12
42
42

votes

5 answers

Check if an integer is within a range

Is there a simple way to evaluate whether an integer is within that range using the (2..100) syntax. For example, say I wanted to evaluate as true if my integer x = 100, and my range is (0..200), I'm just looking for the simple, concise ruby-way of…

ruby

asked Aug 17 '10 at 18:02

JP Silvashy

46,977
48
149
227

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12 answers

Why is this RMagick call generating a segmentation fault?

I've been banging my head against the wall for the better part of an hour trying to figure out what's going wrong here, and I'm sure (or rather hoping) it's something fairly obvious that I'm overlooking. I'm using Ruby 1.9.1, Sinatra 1.0, and…

ruby sinatra segmentation-fault rmagick ruby-1.9.1

asked May 14 '10 at 23:46

Grant Heaslip

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Questions tagged [ruby]

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