From: David L Altenburg <david@...>
Date: 2008-03-21T07:26:22+09:00
Subject: Re: Delcaring a foo[] method

Howdy,

On Mar 20, 2008, at 4:56 PM, Alex Wayne wrote:

> I am trying to define a method that you call like this:
>
>  @obj.foo[123]
>
> I thought I knew how to do this.  I tried to setup the method like so:
>
>  def foo[](value)
>    value * 2
>  end
>


Close. You actually want to override the method named "[]" (and maybe  
"[]=").

So, something like this:

class Foo

   def [](index)
     # logic here
   end

   def []=(index, value)
     # do some stuff
   end

end


So, for the call you want to make work:
 > @obj.foo[123]

@obj.foo needs to return an object with "[]" defined.


HTH,

David