From: Tammo Tjarks <tammo@...>
Date: 2007-08-26T00:20:05+09:00
Subject: Re: reusing the result of previous iteration step for comparison

Thank you very match, 
that helps.

Regards,
Tammo

Logan Capaldo wrote:

> 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
>>
>>
>>