base 62 encoding in ruby (versão devops)

base_62.rb

# monkey patch to have base62 encoding over Integers and Strings

class Integer
  def to_base62()
    char = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"[self%62,1]
    return char if self < 62
    return (self/62).to_base62 + char
  end
end

class String
  def from_base62()
      idx = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz".index(self[-1])
      return idx if self.size == 1
      return idx + self[0..-2].from_base62 * 62  
  end
end
                                                                           
i = 4777
c =  "1F3"
puts i.to_base62
puts c.from_base62

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