Ruby on Rails Tutorial
This book is the only Rails book that does test-driven development the entire time, an approach highly recommended by the experts but which has never been so clearly demonstrated before. Finally, by including Git, GitHub, and Heroku in the demo examples, the author really gives you a feel for what it’s like to do a real-world project. The tutorial’s code examples are not in isolation.
Author(s): Michael Hartl
NA Pages 
This page covers the following topics related to Ruby : Casting type conversions, Arrays, Classes, Hashes, Blocks and procs and lambdas, Inheritance, Control flow, Strings, Symbols, Exceptions, Thread, Methods, Method missing, Numbers, Iteration, Regular Expressions and regex based operations, Comparable, Gem usage, Design patterns and idioms, Loading source files, Range, Comments, Special constants in Ruby, Modules, Ruby version manager, Gem creation / management, Constants, Variable scope and visibility, rbenv, Environment variables, Singletons, File I/O, Time, Queue, Destructuring, IRB, Enumerators, C extensions, Struct, Metaprogramming, Dynamic evaluation, instance eval, Message passing, Keyword arguments, DateTime, Truthiness, JSON with Ruby, Implicit receives, understanding, Monkey patching, Introspection, Monkey patching, Refinements, Monkey patching in Ruby, Catching exceptions with begin rescue, Command line apps, Debugging, Pure RSpec JSON API testing, Recursion, Installation, ERB, Introspection, Random numbers, Getting started with Hanami, OptionParser, Splat operator, Multidimensional Arrays, Enumerable, Ruby access modifiers, Operating system or shell commands, Contributors.
Author(s): programming-books.io
NA Pages
Ruby Programming by Wikibooks.org
This book is currently broken down into several sections and is intended to be read sequentially. Topics covered includes: Notation conventions, Basic Ruby, Ruby Semantic reference, Built in Classes, Standard Library.
Author(s): Wikibooks.org
NA Pages
