1. Tech

Your suggestion is on its way!

An email with a link to:

http://ruby.about.com/popular.htm

was emailed to:

Thanks for sharing About.com with others!

Ruby: Most Popular Articles

These articles are the most popular over the last month.
A Quick Guide to Creating and Using Hashes in...
This article explains and teaches how to use a associative arrays (hashes) as a way to store multiple variables in one data structure.
A Quick Guide to Forming Command Line Arguments...
Use command-line arguments to pass parameters to your Ruby scripts from the command line.
What Every Coder Should Know About Running Ruby...
Learn how to use the command line interface on Windows, Linux and OS X to run rb files and use the interactive Ruby program. Page 2.
How to Fix Missing Class or Module Errors
Problem: You encounter an error reading NameError: uninitialized constant Something or NameError: uninitialized constant Object::Something (with various class names in place of Something).
How to Create Arrays in Ruby
This article explains and teaches how to use a arrays as a way to store multiple variables in one data structure.
A Quick Guide to Using Environmental Variables...
Using environment variables in Ruby.
A Quick Guide to Installing Ruby on Linux
How to install Ruby on the Linux operating system.
How to Create a URL Shortener in Ruby on Rails...
URL shortening is a useful feature for any Rails application. Making it easy for people to share links to your content is always a good thing.
NameError: undefined local variable or method...
Problem: You encounter an error reading NameError: undefined local variable or method `a' for # or NameError: undefined local variable or method `a' for main:Object (with various identifiers in place of 'a').
Splitting Strings
Unless user input is a single word or number, that input will need to be split, or turned into a list of strings or numbers.
Using the 'split' Method in Ruby
String manipulation using the split method in Ruby. Split strings into a list of substrings.
How to Use 'Loops' in Ruby (While, Until, Each,...
Loops, including while and include loops, are one of the most commonly used constructs in computer programs. Page 2.
How to Use Comments for Ruby Code
Use comments to annotate your Ruby code.
Using Strings
Using and manipulating strings and substrings in Ruby. Page 4.
Here's What Ruby Is
What type of language is the Ruby programming language?
How to Use OptionParser: Ruby's Powerful...
Ruby comes equipped with a powerful and flexible tool to parse command-line options, OptionParser. The class is an alternative to GetoptLong for analyzing command line options.
A Simple Guide to Using the Command Line in Ruby
How to use the command line interface on Windows, Linux and OS X to run Ruby scripts and use the interactive Ruby program.
Check Email With Ruby
Learn to use Ruby's pre-installed POP3 libraries to check your email.
How to Use 'DIR.GLOB' with Directories in Ruby
In the previous article in this series, we discussed the basics of the Dir class. Particularly useful was the Dir.for each method for iterating over all files in a directory. However, this only goes so far. What if you want to iterate over only some files (for example, just XML files) in a directory?
A Simple Guide to Using Aliases in Ruby
Aliasing is a powerful Ruby feature that allows more than one method to be referred to by multiple names. This can be used to give a programmer more expressive options or to create copies of a method, allowing you to change the behavior of a class.
Checking Your Email with Ruby
How to check POP3 email accounts in Ruby.
Creating a URL Shortener in Rails
The following is a list of articles that will show you how to write, style and deploy a URL shortener (like TinyURL) application in Ruby on Rails.
Using Attributes
There are two basic things you can do with an object: call a method on it and access an attribute. Ruby doesn't make a distinction between these things, but it does give you some tools to make some methods act like attributes.
Making Deep Copies in Ruby
It's often necessary to make a copy of a value in Ruby. While this may seem simple, and it is for simple objects, as soon as you have to make a copy of a data structure with multiple array or hashes on the same object, you will quickly find there are many pitfalls.
How to Use 'OptionParser' for Command Parsing...
Using OptionParser to parse command line options is a preferable alternative to GetoptLong or looking through ARGV manually. But how do you use it?
Wondering if You Should Overlook The "Require"...
The 'require' method is the reusable code mechanism in Ruby. It allows you to import other source files into your programs.
Generating Random Numbers in Ruby
It's often useful in games, simulation and unit testing to generate random numbers, Ruby provides easy access to a pseudo-random number generator.
Instantiation and the Initialize Method
Ruby objects are instantiated using the Class.new method, and initialize using their own initialize methods.
How to Use Case (Switch) Statements in Ruby
The case statement is a control structure that is usually quite limited in other programming langauges. However, it's quite powerful and flexible in Ruby.
Instance Variables
Instance variables are some of the most common and important variables types in Ruby. They begin with the at sign (@) and allow objects to track their internal state.
How to Use 'Ternary' (Conditional) Operators in...
class="no-js" itemscope itemtype="http://schema.org/Article" > itemprop="description" >The ternary (or
How to Install JSON Gem in Ruby
It's easy to jump into parsing and generating JSON in Ruby with the json gem. It provides an API for parsing JSON from text as well as generating JSON text from arbitrary Ruby objects. It's easily the most used JSON library in Ruby.
3 Ruby Scripts for Twitter Automation
Exploring and knowing the Twitter API is fine, but what do you do from there? Here are 3 practical scripts to help you follow followers on Twitter, update your Twitter account via an RSS feed and to be notified of your friend's new Tweets as they come in.
Two Dimensional Arrays in Ruby
We'll use a two dimensional array to represent the 2048 game board, but how do we create a 2D array in Ruby?
Installing RVM on Linux
Installing the Ruby Version Manager (RVM) on Linux
Global Variables
Global variables are not often used in Ruby, however, you should at least understand their usage should you ever encounter them.
Using the Logger Library--How to Write Log...
How to use the logger library to create and write to log files in Ruby.
Part 3: Implementing
In this part, we'll implement a complete working application.
Iterating Over Strings
It's not a very common thing in Ruby. You have more sophisticated string tools (such as split or scan), but there are times when you'd want to iterate over the characters in a string. Unicode complicates this matter, but Ruby makes it simple.
Quick Rails 4 Blog Tutorial
What do you do when a new version of Rails comes out? Build a blog, of course. The blog is kind of the hello, world application of the web application world.
How to Use String Substitution in Ruby
class="no-js" itemscope itemtype="http://schema.org/Article" > itemprop="description" >Splitting a string
How to Install Ruby's Development Environment...
In the past, the Ruby “One-Click Installer” was the primary choice for installing Ruby on Windows. However, the One-Click Installer fell into disrepair and was eventually abandoned. Something new was needed, and thus, RubyInstaller was born.
How to Install Ruby
How to install the Ruby interpreter on Windows, Linux and OS X.
What is Ruby?
New to Ruby? Or even to programming? Find out what Ruby really is (and isn't) and why you should (and shouldn't) use it.
Install Ruby on Windows
How to install the Ruby interpreter on the Windows operating system.
Can I add empty directories to Git repositories?
Can I add empty directories to Git repositories?
25 Gem Commands for RubyGems
The gem command is one of the most used Ruby-related commands. This article shows 25 Gem Commands and their functions.
How to Install and Use Ruby's Tk Toolkit
Directions of how to install the Tk GUI and its Ruby bindings on Windows, Linux and Mac OS X.
Boolean Operators
While simple boolean expressions will get you pretty far, you'll soon find yourself wanting to act on more than one condition. For that you'll need boolean operators.
How to Install Gems from Git Repositories in Ruby
How to install gems from git repositories.
Understanding 'String Literals' in Ruby
The basics of strings, string interpolation, single and double quotes, escape sequences and alternate string literal syntaxes.
Making a Text Adventure Game in Ruby
Text adventure games were a very popular game genre on minicomputers and microcomputers from the 1970's through the 1990's. This article series will take you through each step of making a text adventure game in Ruby.
Net::SSH--The SSH (Secure Shell) Protocol
Net::SSH is a way for Ruby to interact with SSH (Secure Shell) protocol. It relies on the OpenSSL library for encryption.
Be Notified of New Twitter Updates by IM
Be notified of Twitter updates by IM, using this Ruby script. It's a pain to switch to a Web browser every you want to check your Twitter account. This script solves that by sending you an instant message (IM) using the Jabber protocol when there's something new to see on Twitter.
What is Bundler?
Bundler is a gem dependency manager for Ruby.
How Does Ruby Compare to the Java Programming...
What features do Ruby and the Java programming language share? How are they alike and how are they different?
4 Ways Ruby is Better Than Your Programming...
A comparison of Ruby to other programming languages, including Perl, Java, Python and PHP.
Mapping Arrays
Iterating over arrays isn't the only trick up Ruby's sleeve. Having the ability to map arrays (and other enumerable collections) is a powerful feature.
Getting Started with Bundler
The basics of using Bundler are very trivial, you can be up and running in just a few minutes.
Agile Development
The principles of Agile Development and how agile applies to Ruby on Rails.
CSV Example: Parsing CSV
A crash course on what CSV is, what it is used for and how it is parsed. A method for parsing CSV files using only Ruby's built-in string methods is presented and discussed.
Rails Blog Tutorial - Allowing Comments
Part four of the Ruby on Rails blog tutorial shows you how to create a comments table to allow users to comment on your blog posts.
Creating Hashes from Arrays
How do you create hashes from tabular data? There are a few ways, but there's a way built into Ruby that fits onto a single line.
How Does Ruby Compare to Python?
How do Ruby and Python compare in terms of features, form and function?
The 10 Fantastic Free Ways to Learn Ruby
Sometimes the old adage rings true: the best things in life are free. If you've wanted to learn a little Ruby, but haven't been able to fit a programming course into your budget, don't worry. There are a number of places on the Web to begin your learning, without sacrificing money or quality.
Visual Tutorial: Installing Ruby on Windows
A visual walkthrough on installing Ruby on Windows. Page 3.
How Use RMV to Install Ruby On OS X Snow Leopard
OS X has pretty easy access to a GCC development environment installed with XCode (an IDE and development
Doing Things Wrong in Ruby: Number Guessing...
Doing things wrong in Ruby: to to (and how not to) write a number guessing game in Ruby.
RubyMine 5.0
I've always been a Vim person. Just give me a good solid editor and I'll take it from there. But I decided to give RubyMine a good honest try, and here's what I think about it.
extconf.rb:1:in `require': no such file to load...
Problem: You're trying to install a gem and you encounter an error reading no such file to load -- mkmf. This doesn't always occur, only when you're trying to install gems with native C code that must be compiled.
What is Cloud Computing?
What is cloud computing? Interviews with industry experts help us define cloud computing, software as service, platform as service and more.
Mouse and Keyboard Input in Gosu
Games are, by definition, interactive. Gosu makes this interaction straightforward with a simple interface for detecting and reacting to key and mouse button presses.
What is Rack?
There’s a lot of talk about Rack , but unless you’re a framework author yourself, you rarely see it. So what is Rack? And why, as an application developer, should you care about it?
Combining Arrays in Ruby
There are a number of ways to combine arrays in Ruby.
Keyword Arguments
Until Ruby 2.0, Ruby has not had true keyword arguments. You could simulate them using a hash, but as of Ruby 2.0 there's no longer any need to do that.
How to Use and Create Blocks in Ruby
How to use blocks in Ruby.
5 Must Know Features of the Ruby Language
If you're going to program in the Ruby language, there are some basic features you absolutely must know. Here are the Top 5.
Optional Method Parameters with Hashes
Using hashes to simulate optional named parameters in methods.
Adding and Installing Gems from the Ruby Gems...
Learn to search the Ruby Gems repository to find gems to add and install to your library.
Sorting Arrays
One of the most common tasks when dealing with arrays is to sort them. Luckily, Ruby makes this simple and flexible.
Load Vs. Require
You probably know about the 'require' method (yes, it is a method, it's not a keyword), but what about the 'load' method? What's so different about it?
Constant Variables
class="no-js" itemscope itemtype="http://schema.org/Article" > itemprop="description" >The speed of light
Using Rack
In the previous article, you learned what Rack is. Now, it’s time to start using Rack and serve up some pages.
How to Display Your Ruby Version in Your Bash...
With RVM installed on your system, it's easy to have many versions of Ruby installed. And, especially if you switch between them often, it's easy to forget which Bash command prompt is using which Ruby version. You can solve this by putting your Ruby version in your Bash prompt.
Riding Shotgun with Sinatra
Now that you can write controller logic and views and Haml, you can start putting together some more complex application. There's one very annoying thing though: Sinatra does not reload its code whenever you make a change. If you make a change, you have to stop and restart the server. This is just an extra step and generally an annoyance. This where shotgun comes in.
A Beginner's Guide to Creating a Blog in Ruby
Part one of the Ruby on Rails blog tutorial focuses on creating a Rails project and scaffolding a basic blog post data structure.
Overloading Operators
What does a + b mean? That all depends on what 'a' is. Ruby allows you to define a number of arithmetic operators and they're called on the left-hand side of any such expression.
Rails Application Flow
When you program with any framework, you relinquish flow control in favor of convenience. The following is a description of what happens to a request as it passes through Ruby on Rails.
Router Basics
The Ruby on Rails router is responsible for determining which action to run depending on the HTTP request type and URL passed by the web server.
NoSQL and Document Oriented Databases
Chances are, you've spent your entire database life with relational databases. Data gets organized into columns, and stored in rows. You manipulate data with SQL (Structured Query Language) and there's really no other way to do it. There are competing SQL servers out there (MySQL, SQLite, etc), but they all more or less operate in the same way. But there's much more out there than SQL databases, especially with all the new software in the past few years.
Installing Gosu
While Gosu does require native compilation, the developers thankfully require pre-compiled packages for all platforms. On Windows, Linux and OS X, Gosu can be installed with a single gem command.
Building Hashes
A hash is an associative array. Instead of using numerical indexes, any object (but typically symbols) can be used. They can be both a fast way to retrieve an object based on a key, and a convenient key/value store. There's no doubt, hashes are one of the most used types in Ruby.
undefined method `to_sym' for nil:NilClass
Problem: Seemingly at random, you've encountered the error undefined method `to_sym' for nil:NilClass, or a similar error message for any method name other than to_sym.
What's New in Rails 4?
Now that Rails 4 is out, let's see what's new.
Rapid Game Prototyping in Ruby
Myth: Ruby is unsuitable for game development. It's much too slow, there are no good libraries and it's too hard to deploy your games written in Ruby.
Buttons and Submitting Forms
class="no-js" itemscope itemtype="http://schema.org/Article" > itemprop="description" >Buttons primarily
Block Parameters and Yielding
class="no-js" itemscope itemtype="http://schema.org/Article" > itemprop="description" >Block parameters
How Can I Store Key/Value Pairs in Ruby?
Storing key/value pairs in Ruby doesn't always need to be accomplished by using a hash. You can also use the Struct and OpenStruct classes.
What is Sinatra?
Sinatra is a web framework. Simply put, it's a library that allows you to write web applications with a minimum of red tape.
Creating and Distributing Gems with Bundler
Creating Ruby gems has always been a bit of a pain. When you get right down to it, it's not a hard thing to do, but it's easy to forget how if you don't do it often enough. There are quite a few gems to help you write other gems, but if you're using Rails 3, there's already a gem on your system that does this: Bundler.
Finding Links
class="no-js" itemscope itemtype="http://schema.org/Article" > itemprop="description" >Most likely, you'll
Reading Files
Ruby programs rarely exist in their own little world. And while many choose to communicate over the internet, there's still plenty of need to access plain old files.
The Algorithm
Before we start coding, we take some time to look at the game of 2048.
Step 3: Authentication with Devise
Before we get too invested in our blog, we need to set up some authentication. We'll be using the popular and capable Devise gem to handle authentication.
What's New in Ruby 1.9.1? -The Lambda Operator
Among the new features in release of Ruby 1.9.1 is the Lambda operator, a shortcut used to make nameless methods. Learn how to use this feature introduced in Ruby 1.9.1.
Net:SSH--Executing Programs with Net::SSH
Running programs with Net::SSH is simple enough. The Session object gives you two convenient methods with which to accomplish this task.
Installing Ruby
Instructions for installing Ruby on Windows, Mac OS X and Linux as well as instructions for installing a few Ruby-related extras.
Test Driven Development in Ruby -- Writing Code
Learn to start writing Ruby code using Test-Driven Development.
Using the Enumerable Module
By using the Enumerable module, you can make any of your classes act like Ruby standard collections. All you need to do is implement the 'each' method.
Everything You Need to Know About Variables
Variables are named references to objects in memory. Their several variants (local, instance, class, constant, etc) each have their own subtleties.
Constants in Ruby
Like just about every programming language every conceived, Ruby supports constants. A constant is a variable whose value cannot be changed. However, in Ruby, this has some caveats.
Installing jRuby With RVM on OS X
As with most flavors of Ruby, the easiest, cleanest and least painful way to install jRuby is with RVM, the Ruby Version Manager. And although jRuby is different than MRI, the official Ruby interpreter, it can be installed just as easily, arguably easier.
Base64 in Ruby
Base64 is a way to represent any data as ASCII data. Ruby provides a few handy functions to encode and decode Base64.
Hello, Sinatra! Using Sinatra in Ruby
How to get started in Sinatra, including how to use actions, parameters, ERB and views.
Eval: Running Code on the Fly
Most non-compiled languages have some kind of eval function, which will take a string and execute it as code.
Logging what Mechanize Does
class="no-js" itemscope itemtype="http://schema.org/Article" > itemprop="description" >In order to analyze
What is Ruby on Rails?
Learn about the concepts of Ruby on Rails, a Model-View-Controller framework for creating database-driven websites in Ruby.
Running the Ruby Profiler
Running the Ruby profiler to determine which methods are most expensive and which need to be optimized.
A Few of my Favorite Ruby Gems
We all have our favorite gems. These are gems that we either use very often, or we loved using so much we find reasons to use them. The following is a list of some of my personal favorite gems in no particular order.
Net:SSH--Transferring Files with Net::SCP
SSH is not just for running commands, it's a general conduit for encrypted communications between two hosts. One common use for SSH is to transfer files using the SCP protocol over SSH. You can use SCP in your Ruby programs with the Net::SCP library, which is a supplement to Net::SSH. Page 5.
Overlooking Input and Output? Using the Input /...
Input and output methods are often overlooked by many Ruby programmers. How often have you used the <b>gets</b> and <b>puts</b> methods without giving them a second glance? Learn all the features of these methods to better put them to use in your code.
Using RVM Gemsets
One of the most powerful, useful and often overlooked features of RVM is the gemset. A gemset is a separate gem directory, so the gems in one gemset don't conflict with the gems in another gemset.
RVM and 'sudo'
RVM is great. However, there may be times where you must run Ruby scripts with RVM as root (or another user) via sudo.
Cryptographic Hashes in Ruby
Generating cryptographic hashes in Ruby is quite easy. Ruby provides both a built in method and gives access to OpenSSL's hashing algorithms in most installations.
Checkboxes and Radiobuttons
class="no-js" itemscope itemtype="http://schema.org/Article" > itemprop="description" >Checkboxes and
What is Test-Driven Development in Ruby?
You may have heard of Test-Driven Development, but what does it really mean? Learn the reasons for using TDD and the features of it.
One Tree to Rule Them All
Some problems seem difficult, there are just too many things to consider and it's going to become a mess. However, if you analyze it, there's often a single data structure that will make the whole thing easier.
An Introduction to Distributed Ruby
Distributed Ruby, or DRb, is a library that allows you to communicate with remote Ruby objects and programs, using TCP/IP network protocols.
Adding Files to a Repository
How to add files to a Git repository.
Using Git With Ruby on Rails
You don't have to use version control, but you should be. In the past, version control software has been large, clunky, required servers and really was only used when working in groups. But with Git, it's so easy that you really have no excuse, you should be using version control.
Getting the Domain From a Hostname
class="no-js" itemscope itemtype="http://schema.org/Article" > itemprop="description" >The question was
Basic Array Operations
Beyond creating arrays using literals, there are a few things you should know to get by with Arrays.
Quick Tip: Install Gems Faster
Some larger projects, especially Ruby on Rails, come with quite a bit of documentation. This is good, documentation is good, but the code that processes this documentation (RDoc) into HTML and ri format is not exactly speedy. On slower computers, or with larger projects, the time this takes becomes and annoyance.
Installing Ruby on Rails on OS X
While Apple does include both Ruby and Ruby on Rails by default with OS X, you'll need to install newer versions. This is a bit of a process, but thankfully you'll only need to get through this just once.
Special Characters & Escape Sequences
Aside from the basic regular expression operators such as groupings and quantifiers, there are some other special characters and escape sequences (backslash followed by a character) that can help you out when you're working with Ruby.
Reddit Clone in Rails Part 1: Setting up
In this tutorial we'll set up the project. We'll generate the Rails project, set up git, and create a dummy User model we'll need for the next step.
Structure of a JSON Document
JSON is a data serialization format for communicating between applications. It's a text format that features a lightweight syntax and closely mirrors the common data structures in modern programming languages.
Visual Tutorial: Installing Rubygame on Windows
A visual tutorial with screenshots showing how to install the Rubygame library on Windows, including installing all needed DLL files. Page 4.
Can't Modify Frozen String
I'm trying to modify a frozen string, but I keep getting this exception. Why?
The Double Bang Operator: !! in Ruby
The Double Bang Operator: !! in Ruby, is this a good way to convert an object to a boolean?
Ruby on Rails 3 Tutorial: Learn Rails by Example
Ruby on Rails 3 Tutorial: Learn Rails by Example by Michael Hartl is a hands on introduction to not only Ruby on Rails but all the related software and services many Rails developers use such as Git, Github, Heroku and RSpec. There are no long-winded discussions on theory or REST or MVC, each and every part of every chapter is a hands on exercise in building a Rails application. This book is recommended for anyone who prefers a hands on approach to learning.
How to Use the Twitter Gem for Ruby
Using the Twitter RubyGem, making API requests to Twitter is even easier than using the twitter method.
List of Rack Middleware
The following is a list of Rack middleware applications that come with the Rack gem. A brief description of each middleware is given.
Installing Ruby on Rails on Windows
Installing Ruby, Rails and the few other things you'll need way always a pain on Windows. It's just not a very friendly environment for the task. But fear not, the guys at EngineYard have made RailsInstaller, and this task is braindead simple and will be done in minutes.
Worked Example: Number Guessing Game
A number guessing game is written, and each of its features explored.
Sinatra URL Matching
How do do various types of URL matching in Sinatra.
Package Manager
A package manager is software on a Linux system that manages the other software installed on the system.
Step 1: Scaffolding Posts
Without a framework like Rails, and particularly the scaffold generator, getting up and running with any project was a pain. You'd be doing a lot of configuring and planning and typing out all the methods to create blog posts and interact with the database. Rails does all this in just a few commands, and while it's not something you'll want to deploy right away, it does give you an excellent starting point.
Embedding Images in Gosu Programs
Games can rarely run from a single file. Even if all of the game's code fits in a single file, there's bound to be image and sound data that accompanies it. Traditionally, to distribute a game, you zip the code and data up in a zip archive and distribute this file. However, sending a zip file isn't very transparent, and you often need a file hosting service to host the zip file.

©2015 About.com. All rights reserved.