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()
    alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
    return alphabet[0] if self == 0
    num = self
    arr = []
    base = alphabet.size
    while num > 0 do
      rem = num % base
      num = num / base
      arr << alphabet[rem]
    end
    arr.reverse.join
  end
end

class String
  def from_base62()
    string = self
    alphabet = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
    base = alphabet.size
    strlen = string.size
    num = 0
    idx = 0
    string.each_char do |char|
      power = (strlen - (idx + 1))
      num += alphabet.index(char) * (base ** power)
      idx += 1
    end
    num
  end
end

i = 4777
c =  "1F3"
puts i.to_base62
puts c.from_base62

fiz uma versão com monkey patch :D

versão funcional com monkey patch:

https://gist.github.com/2209752