From: Tobias Reif <tobiasreif@...>
Date: 2001-11-30T02:24:40+09:00
Subject: [ruby-talk:26940] Re: short article draft for review

David,


>   def my_iterator
>     i = 0
>     while i < 10
>       yield i * 2
>       i += 1
>     end
>   end
> 
>   my_iterator do |result|
>     print "Next result is: "
>     puts result
>   end

Thank you very much for your feedback!

The first example uses an iterator, the second one implements one.
The implementation uses recursion, and thus passes the block.

I think it makes sense to leave both in: the first one is very simple,
and the second one shows blocks and arguments, and recursion.

I see your point of including a simple implementation of an iterator,
without recursion, and thus without passing blocks.

I built an example from your snippet:

-----
def upto limit,modifier='default'
   if modifier == 'even'
     number = 2
     step   = 2
   elsif modifier == 'odd'
     number = 1
     step   = 2
   else
     number = 1
     step   = 1
   end
   while number <= limit
     yield number
     number += step
   end
end

upto 5 do |number|
   puts number
end
upto 5,'even' do |number|
   puts number
end
upto 5,'odd' do |number|
   puts number
end
-----

but the article is very short, and I don't want to feature three 
examples for iterators, two of them implementing one.

Thanks again,

Tobi

-- 
Tobias Reif
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