Follow Techotopia on Twitter

On-line Guides
All Guides
eBook Store
iOS / Android
Linux for Beginners
Office Productivity
Linux Installation
Linux Security
Linux Utilities
Linux Virtualization
Linux Kernel
System/Network Admin
Programming
Scripting Languages
Development Tools
Web Development
GUI Toolkits/Desktop
Databases
Mail Systems
openSolaris
Eclipse Documentation
Techotopia.com
Virtuatopia.com

How To Guides
Virtualization
General System Admin
Linux Security
Linux Filesystems
Web Servers
Graphics & Desktop
PC Hardware
Windows
Problem Solutions

  




 

 

Ruby Programming
Previous Page Home Next Page

Extending Objects

Just as you can define an anonymous class for an object using ``class <<obj '', you can mix a module into an object using Object#extend . For example:

module Humor
  def tickle
    "hee, hee!"
  end
end
a = "Grouchy"
a.extend Humor
a.tickle "hee, hee!"

There is an interesting trick with extend. If you use it within a class definition, the module's methods become class methods.

module Humor
  def tickle
    "hee, hee!"
  end
end
class Grouchy
  include Humor
  extend  Humor
end
Grouchy.tickle "hee, hee!"
a = Grouchy.new
a.tickle "hee, hee!"

This is because calling extend is equivalent to self.extend, so the methods are added to self, which in a class definition is the class itself.
Ruby Programming
Previous Page Home Next Page

 
 
  Published under the terms of the Open Publication License Design by Interspire