feat: today's fcc challenge

src/freecodecamp/daily/2025-11-22/main.spec.ts

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+/**
+ * @copyright NHCarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+
+import { describe, it, expect } from "vitest";
+import { scaleRecipe } from "./main.js";
+
+describe("scaleRecipe", () => {
+  it("should return the correct scaled recipe", () => {
+    expect(scaleRecipe([ "2 C Flour", "1.5 T Sugar" ], 2)).toStrictEqual([
+      "4 C Flour",
+      "3 T Sugar",
+    ]);
+    expect(
+      scaleRecipe([ "4 T Flour", "1 C Milk", "2 T Oil" ], 1.5),
+    ).toStrictEqual([ "6 T Flour", "1.5 C Milk", "3 T Oil" ]);
+    expect(scaleRecipe([ "3 C Milk", "2 C Oats" ], 0.5)).toStrictEqual([
+      "1.5 C Milk",
+      "1 C Oats",
+    ]);
+    expect(
+      scaleRecipe(
+        [
+          "2 C All-purpose Flour",
+          "1 t Baking Soda",
+          "1 t Salt",
+          "1 C Butter",
+          "0.5 C Sugar",
+          "0.5 C Brown Sugar",
+          "1 t Vanilla Extract",
+          "2 C Chocolate Chips",
+        ],
+        2.5,
+      ),
+    ).toStrictEqual([
+      "5 C All-purpose Flour",
+      "2.5 t Baking Soda",
+      "2.5 t Salt",
+      "2.5 C Butter",
+      "1.25 C Sugar",
+      "1.25 C Brown Sugar",
+      "2.5 t Vanilla Extract",
+      "5 C Chocolate Chips",
+    ]);
+  });
+});

src/freecodecamp/daily/2025-11-22/main.ts

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+/**
+ * @copyright NHCarrigan
+ * @license Naomi's Public License
+ * @author Naomi Carrigan
+ */
+
+/**
+ * Given an array of recipe ingredients and a number to scale the recipe, return an array with the quantities scaled accordingly.
+ * @param recipe - The recipe to scale.
+ * @param scale - The scale to apply to the recipe.
+ * @returns The scaled recipe.
+ * @see https://www.freecodecamp.org/learn/daily-coding-challenge/2025-11-22
+ */
+export const scaleRecipe
+  = (recipe: Array<string>, scale: number): Array<string> => {
+    return recipe.map((ingredient) => {
+      const [ quantity, ...unit ] = ingredient.split(" ");
+      return `${(Number(quantity) * scale).toString()} ${unit.join(" ")}`;
+    });
+  };