Implementation of Single Responsibility Principle

src/application.ts

@@ -1,13 +1,18 @@
 import Article from './article';
+import ArticleJsonFactory from './article.json.factory';
+import ArticleRepository from './article.repository';
+import Database from './database';
 
 export default class Application {
   run(): number {
     try {
+      const database = new Database();
+      const articleRepository = new ArticleRepository(database);
       const article = new Article('Mon premier article');
 
-      article.saveInDatabase();
+      articleRepository.save(article);
 
-      const json = article.exportToJson();
+      const json = ArticleJsonFactory.createFromArticle(article);
       console.log('Mon JSON à renvoyer depuis mon API : ', json);
 
       return 0;

src/article.json.factory.ts

@@ -0,0 +1,10 @@
+import Article from './article';
+import { ArticleJson } from './types';
+
+export default class ArticleJsonFactory {
+  static createFromArticle(article: Article): ArticleJson {
+    return {
+      title: article.getTitle(),
+    };
+  }
+}

src/article.repository.ts

@@ -0,0 +1,10 @@
+import Article from './article';
+import Database from './database';
+
+export default class ArticleRepository {
+  constructor(private database: Database) {}
+
+  save(article: Article): void {
+    this.database.save({ title: article.getTitle() }, 'articles');
+  }
+}

src/article.ts

@@ -1,21 +1,7 @@
-import Database from './database';
-
-type ArticleJson = {
-  title: string;
-};
-
 export default class Article {
   constructor(private title: string) {}
 
-  private database = new Database();
-
-  saveInDatabase(): void {
-    this.database.save({ title: this.title }, 'articles');
-  }
-
-  exportToJson(): ArticleJson {
-    return {
-      title: this.title,
-    };
+  getTitle(): string {
+    return this.title;
   }
 }

src/types.ts

@@ -0,0 +1,3 @@
+export type ArticleJson = {
+  title: string;
+};