gistfile1.txt

require 'terminal-table/import'

array =  [[1,2,3,4],[5,6,7,8],[9,10,11,12]]

t = table do 
  array.each do |a|
    add_row a
  end
end
puts t

results = []

while !array.empty?
  # first row
  results << array.slice!(0)
  # rotate
  array = array.transpose.reverse
end

p results.flatten