# Reusing the result of previous iteration step for comparison

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| ???}
}

Regards,
Tammo

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] } }

···

On 8/25/07, Tammo Tjarks <tammo@tammo-tjarks.de> wrote:

Regards,
Tammo

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