From: James Edward Gray II <james@...>
Date: 2005-03-22T10:57:35+09:00
Subject: Re: stepping through arrays simultaneously

On Mar 21, 2005, at 7:51 PM, tsuraan wrote:

> Suppose I have two arrays, one holding times, and the other holding 
> events corresponding to the times.  I want to step through both arrays 
> at the same time.  Is there an elegant way to do this?  For example:
>
> times = [ '1', '2', '3', '4', '5']
> events = [ 'eat', 'sleep', 'eat', 'play', 'sleep' ]
>
> times.size.times { |cnt|
>   puts times[cnt] + ": " + events[cnt]
> }
>
> That's not too pretty; at least, I think the times.size.times {block} 
> is ugly.

For that, I would use Array#each_index().

> Is there a way to join the arrays into an array of n-tuples and step 
> through them one tuple at a time?

Sure is.  You want Array#zip().

Hope that helps.

James Edward Gray II