Add RecipeService

src/app/recipe.service.ts

@@ -0,0 +1,19 @@
+import { Injectable } from '@angular/core';
+import { Recipe } from '../cookbook/type';
+
+@Injectable({
+  providedIn: 'root',
+})
+export class RecipeService {
+  #recipes: Recipe[] = [];
+
+  constructor() {}
+
+  getAll(): Promise<Recipe[]> {
+    return Promise.resolve(this.#recipes);
+  }
+
+  get(id: number): Recipe | null {
+    return this.#recipes.find((recipe) => recipe.id === id) || null;
+  }
+}