From: Logan Capaldo <logancapaldo@...>
Date: 2007-08-26T00:15:31+09:00
Subject: Re: reusing the result of previous iteration step for comparison

On 8/25/07, Tammo Tjarks <tammo@tammo-tjarks.de> wrote:
> I have the general the following kind of problem. I want to check somethin
> which has to hold for the whole collection. I need it for the selection comand.
> Simplified it is something like that
>
> a = { "tst1" => [[1,0],[0,1]], "tst2" => [[0,0],[1,1]], "tst3" => [[0,0],[1,1]]}
> a.select {|elemkey,elemattr|
>         equal = true
>         elemattr.each {|v| equal = equal && (v[0]==v[1])}
>         equal == true
> }
>
> That works so far, but I think it is not a nice solution. Because I use the
> fact, that I use the variable equal which is defined outside the each-block.
> I am even unsure if that will work anymore with the next ruby-versions (1.9).
> Is there a solution only working with variables
> inside the each block? I would prefer a solution with:
> a = { "tst1" => [[1,0],[0,1]], "tst2" => [[0,0],[1,1]], "tst3" => [[0,0],[1,1]]}
> a.select {|elemkey,elemattr|
>         equal = elemattr.each {|v| ????????}
> }
>
a.select { |elemkey, elemattr| elemattr.all? { |v| v[0] == v[1] } }

>
> Regards,
> Tammo
>
>
>