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public class Invoice {
  private bool isForXDepartment; // ตัดทิ้งได้
  private bool isForYDepartment; // ตัดทิ้งได้
  private bool isCalculateVat;
  private bool isCalculateSpecialTax;

  private List<InvoiceItem> items;

  public class InvoiceItem {
    public int quantity;

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public class InvoiceDepartmentY {
  private bool isCalculateSpecialTax;

  private List<InvoiceItem> items;

  public class InvoiceItem {
    public int quantity;
    public string description;
    public double pricePerUnit;
  }

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public class InvoiceNormal {
  private bool isCalculateSpecialTax;

  private List<InvoiceItem> items;

  public class InvoiceItem {
    public int quantity;
    public string description;
    public double pricePerUnit;
  }

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public class InvoiceDepartmentX {

  private List<InvoiceItem> items;

  public class InvoiceItem {
    public int quantity;
    public string description;
    public double pricePerUnit;
  }

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public class Invoice {
  private ISumpriceCalculator sumpriceCalculator;

  private List<InvoiceItem> items;

  public class InvoiceItem {
    public int quantity;
    public string description;
    public double pricePerUnit;
  }

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public interface ISumpriceCalculator {
  double calculateSumPrice(List<InvoiceItem> items);
  double plusVat(double price);
}

public class DepartmentXSumpriceCalculator: ISumpriceCalculator {
  public double calculateSumPrice(List<InvoiceItem> items) {
    return items.sum(d => d.pricePerUnit);
  }

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var calculator = SumpriceCalculatorFactory.createSumpriceCalculator(Department.X, false);
var invoice = new Invoice(calculator);

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public double calculateSumPrice () {
  var price = 0.0;
  price = calculateSumPrice(); // แต่ calculcateSumPrice อาจจะทำงานไม่เหมือนกันขึ้นอยู่กับว่า Inject อะไรเข้ามา
  price = plusVat(price); // เช่นกัน plusVat เราก็ไม่อยากให้ทำงานเหมือนกัน
  return price;
}

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const getPlayerRankingsRepositories = () => { 
  rankingEntryRepository,
  tokenValidator,
  ...getPlayersUserRepositories()
}

const getPlayersUserRepositories = () => {
  playerRepository,
  legacyUserRepository
}

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(ns todomvc.state
  (:require [reagent.core :as r]
            [cljs-uuid-utils.core :as uuid]))

(defonce todo-data (r/atom (array-map)))

(defn add [title]
  (let [new-uuid (uuid/uuid-string (uuid/make-random-uuid))]
       (swap! todo-data assoc new-uuid {:id new-uuid
                                        :title title