From: Dave Lenhardt <davidinanhui@...>
Date: 2008-09-21T07:29:39+09:00
Subject: Re: Explaination of a bit of code

Thanks all.

I should note that these are not my programs but snippets from a book 
(Programming Guide to Ruby) that I am trying to make sure I understand.

Here's another snippet I am wondering on:

catch (:done) do
  while line = gets
    throw :done unless fields = line.split(/\t/)
    songlist.add(Song.new(*fields))
  end
songlist.play
end

So, according to the book, it's looking for badly formatted strings.  If 
there is a badly formatted string, the throw clause is invoked.  Now, 
the question is, where does the throw clause go.  I see that catch 
(:done) is right there, but how does the throw clause "find" the catch 
clause.

In other words, I am trying to understand howt his works compared to...

while line = gets
  throw :done unless fields = line.split (/\t/)
  songlist.add(Song.new(*fields))
   end
end

catch :done
  #handle issues
end
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