From: Dave Thomas <Dave@...>
Date: 2000-12-31T00:40:08+09:00
Subject: [ruby-talk:8357] Re: Stuck on p40 of Programming Ruby

John Rubinubi <rubinubi@cyberspace.org> writes:

> I did get the above example to work, though. Thanks. I still haven't
> managed to get any form like the example in the book to work, though. I
> mean the [] without the associated Module or Class name. It's OK, though.
> I'll press on and figure it will all come together sometime.

Try something like

  class Offset
    def initialize(n)
      @n = n
    end
    def [](offset)
      @n + offset
    end
  end

  o = Offset.new(10)
  o[0]     #=> 10
  o[99]    #=> 109
  o[-12]   #=> -2


Regards


Dave