Retrieve diagonals from array of arrays in Ruby

diagonals.rb

class Array
  def diagonals
    [self, self.map(&:reverse)].inject([]) do |all_diags, matrix|
      ((-matrix.count + 1)..matrix.first.count).each do |offet_index|
        diagonal = []
        (matrix.count).times do |row_index|
          col_index = offet_index + row_index
          diagonal << matrix[row_index][col_index] if col_index >= 0
        end
        all_diags << diagonal.compact if diagonal.compact.count > 1
      end
      all_diags
    end
  end
end

Hi Scott. I'm studying your diagonals method, and I'm trying to follow what is going on, but I'm not understanding the flow. I'd really appreciate it if you could walk me through what is happening. I played with it in Pry. The output makes sense too. I just want to know, step-by-step, what you're doing. Thank you.

Nima

Hey I must have missed this comment when you made it a few months ago. I know its a bit late, but did you ever get to understanding the flow?

yeap, it is really hard to understand. comments in the code would help