From: daz <dooby@...10.karoo.co.uk>
Date: 2005-10-13T13:46:53+09:00
Subject: Re: array1 + array2 newb question


Mike Schramm wrote:
> Hey all,
>
> I'm a ruby newbie, so this will be obvious, but I can't figure it out.
>
> 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]].
>
> so far the closest I have gotten is
>
> a1.collect!{|x| [x, a2.collect!{|y| y}]}
>

The outer iteration should be on a2 ...

#----------------------------------------------------
ANSWER = [[1, :a], [2, :a], [3, :a], [1, :b], [2, :b], [3, :b], [1, :c], [2, :c], [3, :c]]

a1 = [1,  2,  3]
a2 = [:a, :b, :c]

r = [];  a2.each { |e2| r += a1.map {|e1| [e1, e2] } }

p r, ANSWER
p r == ANSWER
#----------------------------------------------------


daz

(Thought I'd better bail out some of the duff answerers ;p)