Coin Changer Kata

coin_changer.rb

class CoinChanger

  def initialize
    @purse = Hash.new(0)
    @coin_values = { :quarter => 25, :dime => 10, :nickel => 5, :penny => 1}
  end

  def make_change(amount)
    @coin_values.each_value do |value|
      if amount >= value 
        coin = @coin_values.invert[value]
        @purse[coin] = amount/value
        amount %= value 
      end
    end
    @purse
  end
end