ragmha

interface Sizes {
  sizes: string[];
}

interface Pizza extends Sizes {
  name: string;
  toppings?: number;
  getAvailableSizes(): void;
}

ragmha

interface Pizza {
  name: string;
  sizes: string[];
  getAvailableSizes(): void;
}

let pizza: Pizza;

function createPizza(name: string, sizes: string[]): Pizza {
  return {

ragmha

interface Pizza {
  name: string;
  sizes: string[];
}

let pizza: Pizza;

function createPizza(name: string, sizes: string[]): Pizza {
  return { name, sizes };
}

ragmha

const enum Sizes {
  Small = "small",
  Medium = "medium",
  Large = "large",
}

let selected: Sizes = Sizes.Small;

function updateSize(size: Sizes): void {
  selected = size;

ragmha

enum Sizes {
  Small,
  Medium,
  Large,
}

enum Sizes {
  ExtraLarge = 3,
}

ragmha

type Pizza = { name: string; toppings: number };

const pizza: Pizza = { name: 'Blazing Inferno', toppings: 5 };

const serialized = JSON.stringify(pizza);

function getNameFromJSON(obj: string) {
  // return (<Pizza>JSON.parse(obj)).name;
  return (JSON.parse(obj) as Pizza).name;
}

ragmha

type Size = "small" | "medium" | "large";
type Callback = (size: Size) => void;

let pizzaSize: Size = "small";

const selectSize: Callback = x => (pizzaSize = x);

selectSize("medium");
console.log(`Pizza size: ${pizzaSize}`);

ragmha

let pizza: [string, number, boolean];

pizza = ["Pepperoni", 20, true];

ragmha

let sizes: number[];

sizes = [1, 2, 3];

let toppings: Array<string>;

toppings = ["pepperoni", "tomato", "baby"];

ragmha

let pizza: { name: string; price: number; getName(): string } = {
  name: "Plain Old Pepperoni",
  price: 20,
  getName() {
    return pizza.name;
  },
};

console.log(pizza.getName());