dictionary

class Dictionary
    def initialize
        @dict = {}
    end
    def entries
        @dict
    end

    def add(word)
        # word_definition = {"word_definition" => nil} if word_definition.class == "String"
        word_hash = word.class == "Hash" ? word : {word => nil}
        @dict.merge!(word_hash)
    end

    def include?(word)
        if @dict[word]
            true
        else
            false
        end
    end

    def empty?

    end

    def find(prefix)
      found_words = {}
      @dict.each do |word, definition|
        if word.start_with? prefix
          found_words.merge!({ word => definition })
        end
      end
      found_words
    end

    def keywords
        @dict.keys.sort
    end
end

my_dictionary = Dictionary.new

my_dictionary.add("fish", "a swimming animal")
my_dictionary.add("fiend")
my_dictionary.add("apple")

puts my_dictionary.entries
puts
puts my_dictionary.keywords
puts
my_dictionary.find('nothing')
my_dictionary.find('fi')

class Book
  EXCEPTIONS = [ 'a', 'an', 'the', 'and' ]

  def initialize
    @title = ""
  end

  def title=(words)
    words.capitalize.split.map! do |word|
      word.capitalize unless @exceptions.include?(word)
    end
    words.join(" ")
  end
end