Extract a new array from an array - Ruby

Question

I have the following exit:

   => [
        [ 0] [
            [0] "CELULA",
            [1] "LENNA                                 ",
            [4] "jul 01",
            [5] " 2015 12:00:00 AM",
            [6] "N",
        ],
        [ 1] [
            [0] "CELULA",
            [1] "ARI
            [4] "jul 01",
            [5] " 2015 12:00:00 AM",
            [6] "P",
        ],
        ...
     ]

I need a new array similar to this one only with the items [1] and [6] of this array.

=> [
        [ 0] [
            [0] "LENNA                                 ",
            [1] "N",
        ],
        [ 1] [
            [0] "ARI
            [1] "P",
        ],
       ...
     ]

Answer 1

We can simplify the code a little bit and leave more "ruby like" :

[["CELULA", "LENNA", "JUL 01", "2015 12:00:00 AM", "N"], ["CELULA", "ARI", "JUL 01", "2015 12:00:00 AM", "P"]].map {|e| [e[1], e[4]] }

[["LENNA", "N"], ["ARI", "P"]]

Basically we create a new Array extracting only the second (index 1) and the fifth (index 4) elements of the Array.

Answer 2

It’s important to leave the code of what you tried to do so the staff will be more motivated to help you.

However, here comes the code that gives you more or less what you need:

dados = [["CELULA", "LENNA", "JUL 01", "2015 12:00:00 AM", "N"], ["CELULA", "ARI", "JUL 01", "2015 12:00:00 AM", "P"]]
novo_array = []

dados.each do |x|
  array_filho = []
  array_filho.push(x[1])
  array_filho.push(x.last)

  novo_array.push(array_filho)
end

p novo_array

What has been done?

• We traverse the array dados. And for each element found in this array (which is another array), we create a new array, with the elements of the second and last position of the array found within the array dados.

• Add the created array (array_filho) in the novo_array