class Rot13

file: rot13.rb

Public Class Methods

rotate(s,deg=13) click to toggle source

# File lib/rot13.rb, line 7
def self.rotate(s,deg=13)

  a = ('a'..'z').map.with_index{|x,i| [x.chr,i] }

  r = s.split(//).map do |x| 
    item = a.assoc(x.downcase)
    c = item ? a.rotate(deg)[item.last].first : x
    x == x.downcase ? c : c.upcase
  end
  
  r.join
end