From: Paul Brannan <pbrannan@...>
Date: 2003-01-24T23:03:53+09:00
Subject: Re: Definition: iterator

On Fri, Jan 24, 2003 at 08:29:11PM +0900, Bulat Ziganshin wrote:
> technically speaking, it's a higher-order function, or functional
> 
> it's not coroutine, because
> 1) we can call block several times
> 2) we can't return control from middle of block

I don't understand what you mean.  I believe that functions that take blocks
meat both these criteria.

def foo
  puts "1"
  yield
  puts "2"
  yield
  puts "3"
  yield
end

foo do
  puts "this is a test"
  next
  puts "you should not see this message"
end

[pbrannan@zaphod tmp]$ ruby foo.rb
1
this is a test
2
this is a test
3
this is a test

Paul