Instance variables are created and accessed from within methods called on the object. Įvery object has a set of instance variables which hold the state of the object. Methods are always called on an object - there are no “class methods”, as there are in many other languages (though Ruby does a great job at faking them). At the root of the class hierarchy is the class BasicObject, from which all other classes, including Object, inherit.Įvery class has a set of methods which can be called on objects of that class. Every object has a class and every class has one superclass. Every value in Ruby is an object, even the most primitive things: strings, numbers and even true and false. ![]() Ruby goes to great lengths to be a purely object oriented language. Ruby combines features from Perl, Smalltalk, Eiffel, Ada, Lisp, and Python. The more technically adept can download the Ruby source code and compile it for most operating systems, including Unix, DOS, BeOS, OS/2, Windows, and Linux. You can also download and install Ruby on Windows. Most Linux distributions either come with Ruby preinstalled or allow you to easily install Ruby from the distribution's repository of free software. While Ruby does not borrow many features from Python, reading the code for Python helped Matz develop Ruby. Ruby also borrows from Lisp and Smalltalk. Ruby borrows heavily from Perl and the class library is essentially an object-oriented reorganization of Perl's functionality. It was developed as an alternative to scripting languages like Perl and Python. Development began in February 1993 and the first alpha version of Ruby was released in December 1994. ![]() ![]() The main website of the Ruby programming language is. Ruby is an object-oriented scripting language originally developed by Yukihiro Matsumoto (also known as Matz). You won't see this message or any elements not part of the book's content when you print or preview this page. This is the print version of Ruby Programming
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