We had an "object oriented Ruby" morning on today's course. "But everything's an object in Ruby" you'll tell me and you're sort of right (we could argue about what symbols and code blocks are), but there are certain elements of object orientation which require specific coverage.

Here are links to three examples:

[link] - a straightforward example of a class definintion, no inheritance, nothing fancy (thout it does have an attribute accessor)

[link] - a demonstration that shows inheritance, embedding of classes within a module, static variable and methods, operator overloading, a singleton method and much more. There are plenty of comments in the source code of this example.

[link] - showing the difference between object and class (dymanic and static) variables.

The following new examples have also been added in other areas:

[link] - command line parameters to a Ruby program

[link] - BEGIN and END blocks, and autosplit

[link] - a comparison of symbols and strings in Ruby

[link] Commenting a regular expression in Ruby

(written 2010-02-03, updated 2010-02-04)

 R110 - Ruby - Special Variables and Pseudo-Variables
  [990] Ruby - Totally Topical - (2006-12-16)
  [1586] Variable types in Ruby - (2008-03-21)
  [1587] Some Ruby programming examples from our course - (2008-03-21)
  [1891] Ruby to access web services - (2008-11-16)
  [2296] Variable scope - what is it, and how does it Ruby? - (2009-07-18)
  [2613] Constants in Ruby - (2010-02-01)
  [3757] Ruby - a teaching example showing many of the language features in short but useful program - (2012-06-09)
  [4502] Reading and parsing a JSON object in Ruby - (2015-06-01)
  [4682] One line scripts - Awk, Perl and Ruby - (2016-05-20)

R109 - Ruby - Strings and Regular Expressions
  [970] String duplication - x in Perl, * in Python and Ruby - (2006-12-07)
  [986] puts - opposite of chomp in Ruby - (2006-12-15)
  [987] Ruby v Perl - interpollating variables - (2006-12-15)
  [1195] Regular Express Primer - (2007-05-20)
  [1305] Regular expressions made easy - building from components - (2007-08-16)
  [1588] String interpretation in Ruby - (2008-03-21)
  [1875] What are exceptions - Python based answer - (2008-11-08)
  [1887] Ruby Programming Course - Saturday and Sunday - (2008-11-16)
  [2293] Regular Expressions in Ruby - (2009-07-16)
  [2295] The dog is not in trouble - (2009-07-17)
  [2608] Search and replace in Ruby - Ruby Regular Expressions - (2010-01-31)
  [2614] Neatly formatting results into a table - (2010-02-01)
  [2621] Ruby collections and strings - some new examples - (2010-02-03)
  [2980] Ruby - examples of regular expressions, inheritance and polymorphism - (2010-10-02)
  [3424] Divide 10000 by 17. Do you get 588.235294117647, 588.24 or 588? - Ruby and PHP - (2011-09-08)
  [3621] Matching regular expressions, and substitutions, in Ruby - (2012-02-23)
  [3758] Ruby - standard operators are overloaded. Perl - they are not - (2012-06-09)
  [4388] Global Regular Expression matching in Ruby (using scan) - (2015-01-08)
  [4505] Regular Expressions for the petrified - in Ruby - (2015-06-03)
  [4549] Clarrissa-Marybelle - too long to really fit? - (2015-10-23)

R108 - Ruby - More Classes and Objects
  [184] MTBF of coffee machines - (2005-01-20)
  [656] Think about your design even if you don't use full UML - (2006-03-24)
  [1217] What are factory and singleton classes? - (2007-06-04)
  [2292] Object Orientation in Ruby - intermediate examples - (2009-07-16)
  [2601] Ruby - is_a? v instance_of? - what is the difference? - (2010-01-27)
  [2603] Ruby objects - a primer - (2010-01-29)
  [2604] Tips for writing a test program (Ruby / Python / Java) - (2010-01-29)
  [2616] Defining a static method - Java, Python and Ruby - (2010-02-01)
  [2620] Direct access to object variable (attributes) in Ruby - (2010-02-02)
  [2717] The Multiple Inheritance Conundrum, interfaces and mixins - (2010-04-11)
  [2977] What is a factory method and why use one? - Example in Ruby - (2010-09-30)
  [3142] Private and Public - and things between - (2011-01-22)
  [3154] Changing a class later on - Ruby - (2011-02-02)
  [3158] Ruby training - some fresh examples for string handling applications - (2011-02-05)
  [3260] Ruby - a training example that puts many language elements together to demonstrate the whole - (2011-04-23)
  [3760] Why you should use objects even for short data manipulation programs in Ruby - (2012-06-10)
  [3781] Private, Protected, Public in Ruby. What about interfaces and abstract classes in Ruby? - (2012-06-23)
  [3782] Standard methods available on all objects in Ruby - (2012-06-23)
  [4366] Changing what operators do on objects - a comparison across different programming languages - (2014-12-26)
  [4504] Where does Ruby load modules from, and how to load from current directory - (2015-06-03)
  [4550] Build up classes into applications sharing data types in Ruby - (2015-10-23)
  [4551] Testing your new class - first steps with cucumber - (2015-10-23)

Back to Handling unusual and error conditions - exceptions

Previous and next or Horse's mouth home

Forward to Skyline and looking up in London

Saturdays out from Melksham - to Oxford, to Didcot or to Swindon
On Malachite Green
Both feet on the same pavement
Skyline and looking up in London
Object Oriented Ruby - new examples
Handling unusual and error conditions - exceptions
Passing code to procedures and yield in Ruby
What are Ruby Symbols?