Finds what hand you have in yachtzee.

yacht_hand.rb

class Yach_hand
  attr_reader :array

  def initialize(array)
    @array = array
  end

  def read_hand
    if yacht?
      "Thats a yachtzee"
    elsif four?
      "Thats a four of a kind"
    elsif full?
      "Thats a full house"
    elsif three?
      "Thats a three of a kind"
    end
  end

private

  def yacht?
    @array.select{|element| @array.count(element) > 4 }.length > 4
  end

  def four?
    @array.select{|element| @array.count(element) > 3 }.length > 3
  end

  def full?
    @array.uniq.map! {|element| @array.count(element) }.sort!.reverse!-[1] == [3,2]
  end

  def three?
    @array.select{|element| @array.count(element) > 2 }.length > 2
  end
end


# ------------- unit tests --------------------

hand = Yach_hand.new([1,1,1,1,1])
puts "#{hand.read_hand} should be a 'Thats a Yachtzee!'"
hand = Yach_hand.new([1,1,3,1,1])
puts "#{hand.read_hand} should be a 'Thats a four of a kind!'"
hand = Yach_hand.new([1,4,1,4,1])
puts "#{hand.read_hand} should be a 'Thats a full house!'"
hand = Yach_hand.new([1,3,4,1,1])
puts "#{hand.read_hand} should be a 'Thats a three of a kind!'"