From: Shawn W_ <shawnw@...>
Date: 2009-09-12T13:06:32+09:00
Subject: Re: Nooby question : multidimensional arrays.

01 class Array2D
02
03   def initialize(width, height)
04   @data = Array.new(width) { Array.new(height) }
05   end
06
07  def [](x, y)
08    @data[x][y]
09  end
10
11  def []=(x, y, value)
12    @data[x][y] = value
13  end
14
15 end

Can someone explain what's going on in this code for a newbie.

I'm getting lost in the looping logic of the second def; and the 3rd def 
I'm guessing has something do do with hashes?

I'm using this code in a simple 2d array. It was working but then I 
changed all of my ranges from (0...value) to (1..value) [I used ranges 
to populate my 2D array with hashes] I now get the error message:

11:in `[]=': undefined method `[]=' for nil:NilClass (NoMethodError)
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