class Cat {
  name: string;
  constructor(name: string) {
    this.name = name;
  }
  meow(): string {
    return `${this.name} says: meow`;
  }
}

const bella = new Cat("bella");
const stella = new Cat("stella");

bella.meow();
// Significance: Compiler will prevent this human error
// stella.bark();

function meowAreYou(cat: Cat) {
  console.log(`${cat.meow()} are you?`);
};

meowAreYou(bella);
meowAreYou(stella);

class Dog {
  name: string;
  constructor(name: string) {
    this.name = name;
  }
  bark(): string {
    return `${this.name} says: bark`;
  }
}

const fergie = new Dog("fergie");

// meowAreYou(fergie);