typoglycemia.rb

module Typoglycemia
  def self.convert(text)
    text.gsub(/(\w+)/) { |word| scramble_middle_characters(word) }
  end

  def self.scramble_middle_characters(word)
    return word if word.length < 4
    word[0] + shuffle_letters(word[1...-1]) + word[-1]
  end

  def self.shuffle_letters(text)
    text.chars.shuffle.join
  end
end