a quick dice roller

dice-roller.rb

class Dice
  attr_accessor :collection

  def initialize(*collection)
    @collection = collection
  end

  def +(other)
    @collection.last + other
    self
  end

  def -(other)
    @collection.last - other
    self
  end

  def *(other)
    @collection.last * other
    self
  end

  def &(other)
    @collection.concat(other.collection)
    self
  end

  def inspect
    @collection.map(&:inspect).join("\n=====\n")
  end
end

class Die
  Result = Struct.new(:sum, :dice)

  def initialize(denomination)
    @denomination = denomination
    @count = 1
    @bonus = 0
    @result = Result.new(@denomination)
  end

  def roll
    @result.dice = @count.times.map do
      rand(@denomination) + 1
    end
    @result.sum = @result.dice.sum + @bonus
  end

  def +(other)
    @bonus = other
    self
  end

  def -(other)
    @bonus = other * -1
    self
  end

  def *(other)
    @count = other
    self
  end

  def inspect
    roll
    ">> #{@count}d#{@denomination} + #{@count}\n" +
      "dice #{@result.dice.to_s} \n" +
      "bonus: #{@bonus} \n" +
      "total: #{@result.sum}"
  end
end

def d(denomination)
  Dice.new(Die.new(denomination))
end