From: Julian Snitow <vangczung@...>
Date: 2003-03-26T05:24:12+09:00
Subject: Re: Iterate over two lists in parallel

Han Holl wrote:
> 
> It may be more Rubyesque, but unfortunately it doesn't work:
> 
> puts ex.get
> puts "---"
> puts ex.get
> puts "***"
> 
> produces:
> foo
> ---
> bar
> ---
> baz
> ---
> qux
> ---
> florp
> ---
> bzaa
> ---
> worble
> ---
> nil
> ---
> foo
> ***

Presumably you'd test for nil, making this like a non-destructive 
version of the shift method.  (I.e., the collection itself doesn't have 
to manage the state of the iteration.)