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Ruby - Add class methods at runtime.

, 14 Sep 2006
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Short article showing how to add methods to a class instance at runtime.

Sample Image - Ruby_Dynamic_Methods.jpg


This is a very brief article about one great feature of the Ruby language - dynamically adding methods to classes at runtime.

Basically I have been learning the Ruby language and thought I would share few snippets with people in small articles, so if you are not familiar with Ruby take a quick look and see what you think - you never know it might spark your interest!

Adding methods to class instances

One great feature of Ruby is that it allows you to add methods to individual class instances on the fly. The code is pretty self explanatory so I won't go into any details.

Update - 15 Sep 2006

- In response to some comments regarding how you use reflection etc in ruby I have added a new block of code showing how to reflect against a class, call methods dynamically and a simple benchmark showing the timings for each method.

##   ----  Add methods to a class instance at runtime. ---- ##

# Create a very simple class.
<CODE __designer:dtid="281474976710672">class TestAddMethod
    def method1
        puts "Method1 Called."

More Info

There are other ways to add methods to classes - one is to use a mix-in - where you essentially include all of the methods from a module in a class definition. This allows you to mimic some of the multiple inheritance functionality seen in C++.

Anyway - thanks for your time. Any comments/questions are welcome. As I play with Ruby more I will try to post more articles on things that I find interesting.


Version 1.1


This article has no explicit license attached to it but may contain usage terms in the article text or the download files themselves. If in doubt please contact the author via the discussion board below.

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About the Author

D Leverett
Web Developer
United Kingdom United Kingdom
D Leverett is a software developer who has worked with a variaty of technologies over the years.

I enjoy learning new languages/skills and I am currently working my way through Ruby/Rails.

I am based in the UK and currently work for a recruitment CRM vendor.


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Comments and Discussions

QuestionCan this be doen in C# Pin
supunbula26-Nov-08 19:56
membersupunbula26-Nov-08 19:56 
GeneralDecorator Pin
LucioLucio19-Sep-06 3:51
memberLucioLucio19-Sep-06 3:51 
GeneralDynamic Methods Pin
Baj2213-Sep-06 9:05
memberBaj2213-Sep-06 9:05 
GeneralRe: Dynamic Methods Pin
D Leverett14-Sep-06 23:52
memberD Leverett14-Sep-06 23:52 

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