From: tsuraan <tsuraan@...>
Date: 2005-03-22T11:04:38+09:00
Subject: Re: stepping through arrays simultaneously


On Mar 21, 2005, at 8:57 PM, James Edward Gray II wrote:

> 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().

Ok, that looks good.  I missed it :)

>> 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().

I remember seeing that in pickaxe 2, but it's not in the documentation 
of Array.  It's in the online docs of course, but it's missing from the 
book.  Strange.  Thanks though; I like that function.

>
> Hope that helps.

Very much! Thanks!

--jay