Module: RubyLabs::EncryptionLab

Defined in:
lib/encryptionlab.rb

Instance Method Summary collapse

Instance Method Details

#caesar(s, n = 3) ⇒ Object

:begin :caesar



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# File 'lib/encryptionlab.rb', line 19

def caesar(s, n = 3)
  res = String.new
  s.each_byte do |byte|
    if byte >= ?a && byte <= ?z
      res << rot(byte, ?a, n)
    elsif byte >= ?A && byte <= ?Z
      res << rot(byte, ?A, n)
    else
      res << byte
    end
  end
  return res
end

#rot(char, base, n) ⇒ Object

:end :caesar



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# File 'lib/encryptionlab.rb', line 34

def rot(char, base, n)
  return ((char - base) + n) % 26 + base
end