From: Orion Hunter <orion2480@...>
Date: 2003-04-25T02:32:37+09:00
Subject: block.call vs. yield

I noticed that the use of block/yield differs slightly when a "break" is 
called in the code.  For example:

class Array
	def myI()
		self.each{ |aa| yield(aa) }
	end
end

[0,1,2].myI { |xx| [10,20,30].myI { |yy| break if(yy==20 and xx==0); puts 
"#{xx}:#{yy}" }}'

RESULT:
0:10
1:10
1:20
1:30
2:10
2:20
2:30

==============================================
class Array
	def myI(&blk)
		self.each{ |aa| blk.call(aa) }
	end
end

[0,1,2].myI { |xx| [10,20,30].myI { |yy| break if(yy==20 and xx==0); puts 
"#{xx}:#{yy}" }}'

RESULT:
0:10
0:30  # This result was not expected
1:10
1:20
1:30
2:10
2:20
2:30

My question is, why, when using the second method, does the "break" not seem 
to break completely out of the loop, but rather acts like a "next" by 
terminating the current unit of iteration.  I would not expect to get the 
"0:30" result.  I was under the impression that block.call/yeild were 
synonymous.

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