Solution to Greed Ruby Koan

gistfile1.rb

class Array
  def occurrences_of(match)
    self.select{ |number| match == number }.size
  end

  def delete_one(match)
    for i in (0..size)
      if match == self[i]
        self.delete_at(i)
        return
      end
    end
  end
end

def single_die_rule(match, score, dice)
  dice.occurrences_of(match) * score
end

def triple_rule(match, score, dice)
  return 0 if dice.occurrences_of(match) < 3
  3.times { dice.delete_one match }
  score
end

def score(dice)
  triple_rule(1, 1000, dice) +
  triple_rule(2, 200, dice) +
  triple_rule(3, 300, dice) +
  triple_rule(4, 400, dice) +
  triple_rule(5, 500, dice) +
  triple_rule(6, 600, dice) +
  single_die_rule(1, 100, dice) +
  single_die_rule(5, 50, dice)
end