From: Brian Candler <b.candler@...>
Date: 2008-10-17T05:05:46+09:00
Subject: Re: newbie adding to array question

Incidentally, I was able to spot the errors very quickly without really 
having to think, but ruby will help you if you run it with the -w flag:

ruby -w fib.rb

or

#!/usr/bin/ruby -w
... rest of code

This gives a number of warnings when dubious code runs, in particular it 
would have told you where you had mistyped an instance variable name:

fib.rb:10: warning: instance variable @fibresults not initialized

fib.rb:22: warning: instance variable @iteration not initialized

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