From: Brian Candler <b.candler@...>
Date: 2010-04-11T16:30:50+09:00
Subject: Re: Hash name increment on iteration?

Shaz wrote:
> Each with index worked for me - didn't realize each variable in the
> array has an index that can be called.

Not exactly. The 'each_with_index' method just yields the array index to 
the block being called.

Inside it will be implemented something like this:

module Enumerable
  def each_with_index
    i = 0
    each do |elem|
      yield elem, i
      i += 1
    end
  end
end

But you could consider it like this:

class Array
  def each_with_index
    size.times do |i|
      yield self[i], i
    end
  end
end
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