From: Roshan James <roshanj@...>
Date: 2005-03-10T21:52:43+09:00
Subject: Is iterating in lock-step possible?

I have been wondering is there is a way to do this. Can I have two
itertors working in lock-step - ie, can I have both of them return a
value each into the same loop body ? 
 
a = [1, 2, 3, 4]
b = [5, 6, 7, 8]
a.each {|a1|
    b.each {|b1|
        # this nests the call to b inside a
    }
}
 
Is there someway I can do something like - 
a = [1, 2, 3, 4]
b = [5, 6, 7, 8]
(a.each, b.each) {|a1, b1|
	#so that I get one value from a and one from b 
}

I hope I have made the idea clear, the above syntax is only illustrative
of what I mean. 

This is possible in python because the iterators are fundamentally
objects that require an explicit next() call and are not bound to the
the loop body/block by syntax as in ruby.

Thanks in advance,
Roshan