From: Dennis Newbold <dennisn@...>
Date: 2002-04-06T03:51:37+09:00
Subject: Re: Question abt. Operation of Iterators

On Fri, 5 Apr 2002, Yohanes Santoso wrote:

> 
> Both Array and String fall under the mathematical list category, not
>  mathematical set. So, their iterators travel in a definite order. In
>  the case of #each, the traversal is from the first subcomponent to
>  the last in that order. That is why there is #reverse on both Array
>  and String.
> 
> YS.
> 
Cool.  Thanks for the quick feedback.  It appears from the documentation
I've been able to find, that the Array class has a very useful
reverse_each iterator, but that the String class only has a reverse
operator.  Since Ruby, overall, seems to be very committed to providing
a very rich polymorphic set of methods applicable to a wide range of
objects (e.g., most everything has a to_s method), it makes me wonder --
do you know why reverse_each was implemented only for Arrays and not for
Strings?  Any plans to add a reverse_each iterator for strings in a
subsequent Ruby release?  Thanks again.

Dennis