转换十六进制,十进制,八进制和ASCII？

Question

尝试在Ruby中使用基础...我已经列出的代码似乎非常重复.还有更好的方法吗？

module Converter
  def self.convert(value, from, to)
    case from
    when :hex
      case to
      when :dec
        # code to change hex to dec
      when :oct
        # code to change hex to oct
      when :bin
        # code to change hex to bin
      when :ascii
        # code to change hex to ascii
      end
    when :dec
      case to
      when :hex
        # code to change dec to hex
      when :oct
        # code to change dec to oct
      when :bin
        # code to change dec to bin
      when :ascii
        # code to change dec to ascii
      end
    when :oct
      case to
      when :hex
        # code to change oct to hex
      when :dec
        # code to change oct to dec
      when :bin
        # code to change oct to bin
      when :ascii
        # code to change oct to ascii
      end
    when :bin
      case to
      when :hex
        # code to change bin to hex
      when :dec
        # code to change bin to dec
      when :oct
        # code to change bin to oct
      when :ascii
        # code to change bin to ascii
      end
    when :ascii
      case to
      when :hex
        # code to change ascii to hex
      when :dec
        # code to change ascii to dec
      when :oct
        # code to change ascii to oct
      when :bin
        # code to change ascii to bin
      end
    end
  end
end

Answer 1

class String
  def convert_base(from, to)
    self.to_i(from).to_s(to)
    # works up-to base 36
  end
end

p '1010'.convert_base(2, 10) #=> "10"
p 'FF'.convert_base(16, 2)   #=> "11111111"