Indy.rb code review exercises 2013-11-13

anagram.rb

class Anagram

  def initialize(target)
    @target = target.downcase
  end

  def match(word_list)
    word_list.select do |word|
      is_anagram?(word.downcase)
    end
  end

  private

  def is_anagram?(word)
    has_same_number_of_letters?(word) &&
      different_from?(word) &&
      maps_cleanly?(word)
  end

  def maps_cleanly?(word)
    @target.each_char do |char|
      word = word.delete(char)
    end
    word == ''
  end

  def different_from?(word)
    word.downcase != @target.downcase
  end

  def has_same_number_of_letters?(word)
    word.chars.count == @target.chars.count
  end

end

bob.rb

class Bob

  def hey(utterance)
    @utterance = utterance
    response
  end

  private

  def response
    case
      when blank?    then 'Fine. Be that way.'
      when shouting? then 'Woah, chill out!'
      when question? then 'Sure.'
      else 'Whatever.'
    end
  end

  def question?
    (@utterance.chars.last == '?') && !shouting?
  end

  def shouting?
    @utterance.upcase == @utterance
  end

  def blank?
    @utterance.nil? || @utterance == ''
  end

end

phrase.rb

class Phrase

  def initialize(phrase)
    @phrase = phrase
  end

  def word_count
    count = Hash.new(0)
    words.each do |word|
      count[word] += 1
    end
    count
  end
 
  private

  def words
    @phrase.downcase.gsub(/[^a-z0-9 ]/, ' ').split(' ')
  end

end