MacRuby: The Definitive Guide
by Matt Aimonetti
Publisher: O'Reilly Media 2010
MacRuby is Apple's implementation of the Ruby programming Language which uses the well known and proven Objective-C runtime. This book is an introduction to MacRuby. Topics covered: Introduction, The Cocoa Environment, Foundation, Application Kit, Core Data, Xcode.
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This book is a great collection of ideas, tricks, and skills that could be useful for Hackers. It's a unique extraction reference, summarizes a lot of research and experience. Rubyfu is a book to use not only to read, it's where ruby goes evil.
by Zed A. Shaw - LCodeTHW
The book assumes absolutely no prior programming knowledge and will guide you carefully and slowly through the learning process. When you are done with it you will have the skill to move on to other books about Ruby and be ready to understand them.
by Huw Collingbourne - No Starch Press
A comprehensive tutorial to the Ruby language. Each chapter is accompanied by ready-to-run source code for all the examples. There is also an Introduction which explains how to use the source code in Ruby In Steel or any other IDE of your choice.
by Heiko Webers - OWASP
In order to prevent attacks, minimize their impact and remove points of attack, first of all, we have to fully understand the attack methods in order to find the correct countermeasures. That is what this security guide aims at.