From: "Jan E." <lists@...>
Date: 2012-04-17T09:19:48+09:00
Subject: Re: A Beginner's Question about Metaprogramming

Phil Stone wrote in post #1056802:
> But when I say
>     class MyClass
>        def self.hello
>           "hi"
>        end
>     end
>
> The above is also true in this example: No other class gets the "hello"
> method, and I didn't have to use a Singleton method.

This *is* a singleton method. It's just a different syntax: Instead of 
explicitly opening the singleton class of "my_object" and defining the 
method "my_method" in it, you can also write

def my_object.my_method ...
  ...
end

It's kind of a short form. However, you cannot use the "def" syntax for 
dynamic method definitions. That's why you either have to open the 
singleton class explicitly or call Module#define_singleton_method, which 
is available in Ruby 1.9 (like I suggested earlier).

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