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Changing a class later on - Ruby
In Ruby, you can define a class ... and then come back and add methods to it. But why would you want to? Let's suppose that you've got a base class - I'll use "Rectangle" as my example, and you've already subclassed it to "Square" and perhaps a few other things, via a required file that you share between a number of programs. Then you want to use that group of classes in a new application, but with a modification to one of the base methods. The example I used during yesterday's course was that the rectangles were pictures, and I wanted to add a frame, 1 unit wide, around them in my new code. [full source]. Well - given that scenario, you've got an excellent excuse for going back within your own code and replacing the methods of Rectangle that are changed when you add a frame, and it'll be the new routines that are run when you call methods in the already-defined subclasses. It's very neat indeed, and the alternative would be ugly. (written 2011-02-02) Associated topics are indexed under R108 - Ruby - More Classes and Objects[3260] Ruby - a training example that puts many language elements together to demonstrate the whole - (2011-04-23) [3158] Ruby training - some fresh examples for string handling applications - (2011-02-05) [3142] Private and Public - and things between - (2011-01-22) [2980] Ruby - examples of regular expressions, inheritance and polymorphism - (2010-10-02) [2977] What is a factory method and why use one? - Example in Ruby - (2010-09-30) [2717] The Multiple Inheritance Conundrum, interfaces and mixins - (2010-04-11) [2623] Object Oriented Ruby - new examples - (2010-02-03) [2620] Direct access to object variable (attributes) in Ruby - (2010-02-02) [2616] Defining a static method - Java, Python and Ruby - (2010-02-01) [2604] Tips for writing a test program (Ruby / Python / Java) - (2010-01-29) [2603] Ruby objects - a primer - (2010-01-29) [2601] Ruby - is_a? v instance_of? - what is the difference? - (2010-01-27) [2292] Object Orientation in Ruby - intermediate examples - (2009-07-16) [1587] Some Ruby programming examples from our course - (2008-03-21) [1217] What are factory and singleton classes? - (2007-06-04) [656] Think about your design even if you don't use full UML - (2006-03-24) [184] MTBF of coffee machines - (2005-01-20)
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A new monopoly on the ferry to Northern IrelandSplitting data reading code from data processing code - Ruby Rake - a build system using code written in Ruby Changing a class later on - Ruby Points West to Belfast Jargon busting Disassembling Python and Java - previously compiled code Python dictionaries - mutable and immutable keys and values Looking back at www.wellho.net |
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