From: Fabian Streitel <karottenreibe@...>
Date: 2009-07-14T21:52:01+09:00
Subject: Re: Twelve rules of Ruby

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I'd say one of the main suspects here is closures:
returning from a block is different from returning from a lambda is
different from returning from a Proc, ...:
   def f block
        block.call
        'f'
   end

   f(Proc.new { return 'Proc.new' }) #=> LocalJumpError
   f(proc { return 'proc' }) #=> 'f' in 1.8, LocalJumpError in 1.9
   f(lambda { return 'lambda' }) # => 'f'

   def g
       f(Proc.new { return 'Proc.new' })
       'g'
   end

   g() #=> 'Proc.new'

etc. etc. See also this very nice summary here:
http://innig.net/software/ruby/closures-in-ruby.rb
If you know that, you should be able to impress a bunch of people *g*

Greetz!

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