From: Devin Mullins <twifkak@...>
Date: 2005-10-13T13:18:53+09:00
Subject: Re: array1 + array2 newb question

> I'm trying to create a map grid from arrayed names of streets.  I  
> want to go from [1,2,3] and [a,b,c] to [[1,a], [2,a], [3,a],  
> [1,b],... [3,c]].


Given:

a1=[1,2,3]
a2=%w{a b c}

The brute force way:

a = []; a1.length.times {|i| a << [a1[i],a2[i]]}

The Ruby Way:

a = a1.zip a2

Plenty of other ways, too, using inject, Enumerator, etc. I'm sure 
they'll all be contributed in a few minutes.

collect! is a whole 'nother beast -- it can be munged to do the task at 
hand,* but isn't quite appropriate, since it doesn't tell the block what 
index you're currently at. Have you read the ri documentation on it?

Devin

*i = -1; a1.collect! { i+=1; [a1[i],a2[i]] }