Extending String and Array with bitmask helpers

bitmask_helpers.rb

# Convert a number in a string to a different base (stolen from stackoverflow.com)
class String
  def convert_base(from, to)
    self.to_i(from).to_s(to)
  end
end

# Convert an array to it's maximum value if it were representing binary and filled with 1's
class Array
  def max_bitmask
    self.map{1}.join().convert_base(2,10).to_i
  end
end