From: James Edward Gray II <james@...>
Date: 2006-12-02T04:14:32+09:00
Subject: Re: Simple iteration in a function problem

On Dec 1, 2006, at 12:57 PM, Blake Miller wrote:

> i'm trying to do this, and I'm stuck

I've tried to answer your question and Rubyify your code a bit:

class YHolder
   def initialize
     @ys = Array.new
   end

   def add_y(y)
     @ys << y
   end
   alias_method :<<, :add_y

   def fetch_by_id(id)
     @ys.find { |y| y.object_id == id }
   end
   alias_method :[], :fetch_by_id
end

class Y; end
class X < Y; end

holder, ids = YHolder.new, Array.new
10.times do
   new_y_or_x = [Y, X][rand(2)].new

   ids    << new_y_or_x.object_id
   holder << new_y_or_x
end

p holder  # show the collection

# pick one by id
pick = ids[3]
p pick
p holder[pick]

# >> #<YHolder:0x1e2928 @ys=[#<Y:0x1e289c>, #<X:0x1e2874>, #<X: 
0x1e284c>,
# >>                         #<Y:0x1e2824>, #<X:0x1e27fc>, #<Y: 
0x1e27d4>,
# >>                         #<Y:0x1e27ac>, #<X:0x1e2784>, #<X: 
0x1e275c>,
# >>                         #<Y:0x1e2734>]>
# >> 988178
# >> #<Y:0x1e2824>

__END__

Hope that helps.

James Edward Gray II