# Simple implementation
# (note that a method named #rotate already exists on Array, so there's some
# risk of confusion)
class Array
  def rotate_right
    transpose.map(&:reverse)
  end
 
  def rotate_left
    map(&:reverse).transpose
  end
end
 
# More general implementation
class Array
  # Positive numbers rotate clockwise, negative number rotate counter-clockwise
  def rotated(times = 1)
    case times % 4
    when 1, -3
      transpose.map(&:reverse)
    when 2, -2
      reverse.map(&:reverse)
    when 3, -1
      map(&:reverse).transpose
    else
      self.dup # rotate 360; no change
    end
  end
end
 
array = [[1, 2, 3],
         [4, 5, 6],
         [7, 8, 9]]
 
puts "Original array:"
puts array.map { |row| row.map(&:to_s).join(" ") }
 
puts "Rotated once clockwise:"
puts array.rotated.map { |row| row.map(&:to_s).join(" ") }
 
puts "Rotated once counter-clockwise:"
puts array.rotated(-1).map { |row| row.map(&:to_s).join(" ") }
 
puts "Rotated twice:"
puts array.rotated(2).map { |row| row.map(&:to_s).join(" ") }
 

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