diff --git a/src/clean/usecases/createLocation.ts b/src/clean/usecases/createLocation.ts
index 3e51a7b..f9a9957 100644
--- a/src/clean/usecases/createLocation.ts
+++ b/src/clean/usecases/createLocation.ts
@@ -60,6 +60,44 @@ export default function createLocation(
   presenter.show(location);
 }
 
+// Autre possibilité, exit les presenters et on retourne le résultat directement.
+// export function createLocation_(
+//   locationRepository: LocationsRepository,
+//   cmd: CreateLocationData
+// ): string {
+//   // TODO implémenter le cas d'utilisation d'écriture
+//   return "id de la localisation crée";
+// }
+
+// interface
+
+/**
+ * Dans mon application web
+ * post("/locations", () => {
+ *  const id = createLocation(req.body)
+ * return getLocation(id)
+ * })
+ */
+
+type LocationDto = {
+  id: string;
+  name: string;
+  lat: number;
+  lon: number;
+  temperaturesHistory: number[];
+};
+
+interface DataGateway {
+  getLocationById(id: string): LocationDto;
+}
+
+export function getLocation(
+  gateway: DataGateway,
+  locationId: string
+): LocationDto {
+  return gateway.getLocationById(locationId);
+}
+
 // export function createLocation_(
 //   locationRepository: LocationsRepository,
 //   cmd: CreateLocationData
diff --git a/src/ddd.ts b/src/ddd.ts
new file mode 100644
index 0000000..55be78d
--- /dev/null
+++ b/src/ddd.ts
@@ -0,0 +1,181 @@
+import { v4 as uuid } from "uuid";
+
+export default class Location {
+  public id: string;
+
+  public constructor(
+    public name: string,
+    public lat: number,
+    public lon: number
+  ) {
+    this.id = uuid();
+  }
+}
+
+// class LocationService {
+//   public setLocation(id: string, name: string) {
+//     const location: Location = (location.name = name); // tirer du repository
+//   }
+// }
+
+class Money {
+  public readonly value: number;
+  public readonly currency: string;
+
+  constructor(value: number, currency: string) {
+    if (value < 0) {
+      throw new Error("le prix doit être positif");
+    }
+
+    this.value = value;
+    this.currency = currency;
+  }
+
+  public add(amount: Money): Money {
+    if (amount.currency !== this.currency) {
+      throw new Error("les devices sont différentes !");
+    }
+
+    return new Money(this.value + amount.value, this.currency);
+  }
+
+  public equals(other: Money) {
+    return this.currency === other.currency && this.value === other.value;
+  }
+}
+
+type Latitude = number;
+type Longitude = number;
+
+class Coordinate {
+  constructor(public latitude: Latitude, public longitude: Longitude) {}
+}
+
+class ArticleId {
+  public readonly value: string;
+
+  constructor(value?: string) {
+    this.value = value ?? uuid();
+  }
+}
+
+// function addArticleToCart(article: ArticleId, cart: CartId) {
+
+// }
+
+class CategoryId {}
+
+class Category {
+  private id!: CategoryId;
+}
+
+class CartId {}
+
+class Cart {
+  private id: CartId;
+  private items: CartItem[];
+
+  constructor() {
+    this.id = new CartId();
+    this.items = [];
+  }
+
+  public addArticle(article: ArticleId) {
+    if (this.items.length === 3) {
+      throw new Error("le maximum d'articles est déjà atteint");
+    }
+
+    this.items.push(new CartItem(article));
+  }
+}
+
+class CartItem {
+  public readonly addedDate: Date;
+
+  constructor(public readonly article: ArticleId) {
+    this.addedDate = new Date();
+  }
+}
+
+interface ArticleRepository {
+  save(article: Article): void;
+  getById(id: ArticleId): Article;
+}
+
+class SqliteArticleRepository implements ArticleRepository {
+  getById(id: ArticleId): Article {
+    // SELECT id, price, currency FROM articles;
+    const snapshot = {
+      id: "un id",
+      price: 12,
+      currency: "€",
+    };
+    return Article.__fromSnapshot(snapshot);
+  }
+
+  save(article: Article): void {
+    // INSERT INTO articles (id, price, currency) VALUES(?,?,?)
+    const { id, price, currency } = article.__takeSnapshot();
+  }
+}
+
+type ArticleSnapshot = {
+  id: string;
+  price: number;
+  currency: string;
+};
+
+class Article {
+  private id: ArticleId;
+  private category!: CategoryId;
+  private ref: string;
+  private price: Money;
+
+  __takeSnapshot(): ArticleSnapshot {
+    return {
+      id: this.id.value,
+      price: this.price.value,
+      currency: this.price.currency,
+    };
+  }
+
+  static __fromSnapshot(snap: ArticleSnapshot): Article {
+    const art = new Article("", new Money(snap.price, snap.currency));
+    art.id = new ArticleId(snap.id);
+
+    return art;
+  }
+
+  // private status: "OPEN" | "CLOSE" = "OPEN";
+  // private closedDate?: Date;
+
+  // public close() {
+  //   this.status = "CLOSE";
+  //   this.closedDate = new Date();
+  // }
+
+  constructor(ref: string, price: Money) {
+    this.id = new ArticleId();
+    this.ref = ref;
+    this.price = price;
+  }
+
+  public updatePrice(newPrice: Money) {
+    this.price = newPrice;
+
+    //this.storeEvent(new ArticlePriceUpdated(this.id, newPrice))
+  }
+
+  public addAmountToPrice(amount: Money) {
+    this.price = this.price.add(amount);
+  }
+
+  public equals(article: Article) {
+    return this.id === article.id;
+  }
+}
+
+// new Article("ref1", -1);
+// const article = new Article("ref1", 1);
+
+// article.updatePrice(123);