```ts const cats: Cat[] = [ new Cat({ id: "1aefd497-bb47-47e3-b160-cb69c5ba0ff4", name: "Kami", age: 4 }), ]; @Path("/cats") export class CatController { @Get @Path("/") public list(): Cat[] { return cats; } @Get @Path("/:id") public getById(@PathVariable() id: UUID): Cat | null { return cats.find((cat) => cat.id === id) ?? null; } @Post @Path("/") public create(@RequestBody(Cat) cat: Cat): Cat { cat.id = randomUUID(); cats.push(cat); return cat; } @Put @Path("/:id") public update(@PathVariable() id: UUID, @RequestBody(Cat) cat: Cat): Cat { const index = cats.findIndex((c) => c.id === id); if (index === -1) { throw new NotFoundResponseError("Cat not found"); } cats[index] = cat; return cat; } @Delete @Path("/:id") public delete(@PathVariable() id: UUID): void { const index = cats.findIndex((c) => c.id === id); if (index === -1) { throw new NotFoundResponseError("Cat not found"); } cats.splice(index, 1); } } ```