From: Brian Candler <B.Candler@...>
Date: 2003-04-25T16:25:52+09:00
Subject: Re: Hashes and Enumerable#each_with_index

On Fri, Apr 25, 2003 at 07:26:01AM +0900, Ryan Pavlik wrote:
> OK, looking at the archives I know this was discussed a few years ago,
> but there seems to be no real conclusion or improvement since then.
> 
> The problem:  Hash#each_with_index returns an index that is not usable
> to address the hash.  That is, given the following:
> 
>     h = Hash.new
>     h.each_with_index {
>         | o, i |
>         ...
>     }
> 
> i is not defined such that h[i] == o, which is both misleading and
> seemingly useless.  (This behavior, as per the previous discussion, can
> be achieved with h.to_a.each_with_index.)

Or indeed just 'h.each' (if you replace |o,i| with |i,o|)

It did seem a bit strange to me at first that the methods don't really line
up:

    Array#each              <=>    Hash#each_value
    Array#each_with_index   <=>    Hash#each   (but with args reversed)

Regards,

Brian.