Flatten Array of Integers

Flatty.rb

class Array

  # Flattens only an array of integers with varying dimensions
  def flatty!
    self.to_s.tr('[]','').split(',').map(&:to_i)
  end

  def flatty_test
    a1 = [[1, 2, [3]], 4]
    a2 = [1, [2, 3, 4], [[[5, [6]]]]]
    puts a1.flatty!.to_s
    puts a2.flatty!.to_s
  end
end