From: Sean O'Halpin <sean.ohalpin@...>
Date: 2005-12-01T07:44:51+09:00
Subject: Re: Help constructing interesting hash?

On 11/30/05, Chris McMahon <christopher.mcmahon@gmail.com> wrote:
> Suppose I have an array of arrays like
>
> [[A, B, C][1,2,3]]
>
> I can easily make a hash (using each_with_index) where one value is
> the lookup value for the other value:
>
> 1=>A
> 2=>B
> 3=>C
>
> Now suppose I have a AoA like
>
> [[A, B, C,][1,2,2]]
>
> Is there a readable way to construct a hash like
>
> 1=>[A]
> 2=>[B, C]
>
> ?
>
> Thanks,
> -Chris
>

Here's another way:

a = [['A', 'B', 'C'],[1,2,3]]
h = Hash[*a[0].zip(a[1]).flatten]
p h
-- OUTPUT --
{"A"=>1, "B"=>2, "C"=>3}

Regards,

Sean