Module: EncodeWithAlphabet

Defined in:
lib/encode_with_alphabet.rb,
lib/encode_with_alphabet/version.rb

Constant Summary collapse

ALPHABET = 
'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
VERSION = 
"0.0.4"

Class Method Summary collapse

Class Method Details

.encode(number, alphabet = ALPHABET) ⇒ Object 



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# File 'lib/encode_with_alphabet.rb', line 5

def self.encode(number, alphabet = ALPHABET)
  raise 'number must be an integer' unless number.kind_of? Integer
  raise 'alphabet must be non-empty' if alphabet.empty?

  return alphabet[0,1] if number == 0

  base = ''
  sign = ''

  if number < 0
    sign = '-'
    number = - number
  end

  while number != 0
    number, i = number.divmod alphabet.size
    base = alphabet[i, 1] + base
  end

  return sign + base
end