From: Derek Michael <derekwrobel@...>
Date: 2009-12-19T07:19:55+09:00
Subject: Re: Newbie Question: Blocks and Parameters

Thanks guys.  I think I'm slowly wrapping my head around this.

Now sort of in the lines of the callback you mentioned, I started 
reading about the & operator and being able to convert blocks to procs 
and vice versa.

Here is an example of the code I was reviewing:

puts "----Define a method which takes block as a Proc object argument"
def my_method(count, &my_block)
  value = 1

  # Execute the block "count" times while updating the vlaue i
  1.upto(count) do |i|
    value = value * i
    my_block.call(i, value)
  end

end

puts "----Invoke the method passing a code block"
my_method(5) {|i, result| puts "my_method(#{i}) = #{result} "}


So in this case, the variable 'i' gets the value of variable 'count' 
assigned to it when executing the upto method which invokes a yield?  Am 
I understanding this correctly?  It took me a while looking at that code 
again, to understand where the 'i' was getting it's value...
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