From: James Dinkel <jdinkel@...>
Date: 2008-08-19T22:36:38+09:00
Subject: Re: passing a variable from a block back to the method

Michael Morin wrote:
> 
> You can also use catch and throw.  I think this method is a little 
> cleaner.
> 

ah, I think I like the catch and throw method.  That's pretty close to 
what I was visualizing in my head.

Just one thing though:

> class File
> 
>    def self.change(filename)
>      catch(:nochanges) do
>        # read the file, execute a block, then write the file
>        File.open(filename, 'r+') do|file|
>          lines = file.readlines
> 
>          # return if not changing anything
>          return if yield(lines) == false
> 
>          file.pos = 0
>          file.print lines
>          file.truncate(file.pos)
>        end
>      end
>    end
> end
> 

You left in the "return if yield(lines) == false", was that a typo?  I'm 
guessing it was.
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