TypeScript Array Type Guards explicados en dos minutos

pizza.ts

interface Pizza {
  type: "pizza";
  slices: number;
}

interface Hamburger {
  type: "hamburger";
  vegetarian: boolean;
}

type Food = Hamburger | Pizza;

const foods: Food[] = getFoods();

function getFoods(): Food[] {
  throw new Error("Function not implemented.");
}

const hamburger = foods.find(
  (food): food is Hamburger => food.type === "hamburger"
);

const isVegetarian = hamburger?.vegetarian;

const isPizza = (food: Food): food is Pizza => food.type === "pizza";

const slices = foods.filter(isPizza).map((pizza) => pizza.slices);