From: Brian Candler <B.Candler@...>
Date: 2005-07-12T19:02:30+09:00
Subject: Re: accessing index inside map

> IMHO the enumerator approach is slightly superior as your suggestion can
> lead to conflicts with current method arguments as you have noticed.
> Personally I don't have a problem using
> 
> a.to_enum(:each_with_index).inject(0) {|sum,(a,i)| sum + a*i}
> 
> I think this is more flexible and modularized.  And the overhead of a new
> instance creation is usually neglectible compared to the iteration
> overhead.

"Do the simplest thing which will possibly work" :-)

Actually I think my version reads better:

  a.inject(0,:each_with_index) {|sum,(a,i)| sum + a*i}

"Starting with 0, call :each_with_index with the following block".

Regards,

Brian.