From: Hans Mackowiak <lists@...>
Date: 2013-03-11T21:27:54+09:00
Subject: Re: Confusion with block local variable declaration with block variable declaration within the pipe

***capitalize! returns nil when no changes are made***

so you can do:

if(str.capitalize!)
  puts "Changed!"
else
  puts "Not Changed!"
end

***append (<<) a nil value to the string***

a=""
a << " ".capitalize! #raise an error

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