From: Austin Ziegler <austin@...>
Date: 2002-11-27T13:45:22+09:00
Subject: Re: each_with_index & collect_with_index?

On Wed, 27 Nov 2002 13:32:24 +0900, Jason Persampieri wrote:
> _why:
>> It would be really cool if, instead of having a million
>> *_with_index methods floating around in Enumerable, we had a
>> method which could be used inside a block to retrieve the number
>> of iterations that the block has undergone.
[...]
>> This implementation is flawed, though, because it creates the
>> `index' method in whatever namespace the block is originally
>> placed. But, you know.. what if??
[...]
> Why not have a global var (eg $# or something) that keeps the
> current index whenever you're iterating through an
> array/string/whatever?
> 
> It would be consistent, extremely useful, less confusing and
> completely straightforward.
> 
> OK... let the criticism flow!

One major problem: global.

Globals aren't threadsafe, and by doing a global, I lose any context
capabilities for nested indexing.

-austin
-- Austin Ziegler, austin@halostatue.ca on 2002.11.26 at 23.42.45